7mmRM...What would you do next?

[wisconsinteacher]

66.0 grains for IMR4350 with the 150 Partition showed the best groups so I started seating deeper and this is what I shot today. Speeds were around 3050 fps.

2.722" ogive- 1.232"
2.711" ogive- 1.077"
2.702" ogive- 1.277"



Would you keep seating deeper or just load up some rounds and take the rifle hunting and live with 1.25 MOA?

 

[truck driver]

2.711" looks to be the best of the three, Just to let you know if you don't already that is a tad warm I would back it off some and see if it comes in. I load 63.5grs of H4350 and get 3/4" groups at just under 3000fps.
3 grs of H4350 only gets you about 83fps but over 5k psi increase. I know your using IMR 4350 which is faster then H4350. But SAAMI max for the 7RM is right around 60k psi and your probably pushing close to 63k psi.

 

[norman_brown]

My first question would be where you got your load data from.. 66gr IMR 4350 is awful high

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[TackDriver284]

Are you sure its 66 grains you are using? Looks like you may want to drop a few grains down to 61 grains and work up in .3 increments to find the accuracy node. I suggest you try to see if you can find your maximum OAL kissing the lands and back off .020". Shoot 3 round groups with your selected charge weights, if you find what you like, play with seating depths in or out. I used to use IMR 4350 with 140 -150 grain Ballistic Tips but I like slow burning RL 22, 25, 26 powders to get a better case fill for consistency and helps get single digit ES and SD. Beware of temperature swings in hot and cold climates with RL powders. My deer hunting load from last year was 65.5 grains of RL 19 and 140 Accubonds at 3175 fps. I have pushed it harder to 3280 to 3300 fps with RL22 and RL 25 with 140 Berger VLD and 3,025 to 3,050 fps with 168 Berger VLD. Just watch for pressure signs. http://imgur.com/a/p9X1C

 

[joelkdouglas]

I haven't loaded for a 7 RM, but if I only got 2700 with a 165 PT and 59 grains H4350 in my 30-06 I would keep putting powder in the case until I saw 2900 fps. Use your own judgement of course, but I am pretty convinced that velocity is a better indicator of pressure than grains of powder.

As a matter of fact my 25-06 load is 3 grains above Nosler's max, but the velocity is 3075 fps instead of Nosler's max pressure velocity of 3130 fps. I believe that means my load generates lower pressure than the SAAMI max for the 25-06 and the 110 AB.

If I were WT, I would keep working up (assuming you have the case capacity) slowly, chronoing the loads, and see if 3150 or 3200 fps gave me better accuracy. Just me, everyone has to accept their own risk, but I've seen enough variance in powder lots to trust velocity while also keeping the amount of powder in mind.

 

[wisconsinteacher]

I was doing what joelkdouglas said. I got to 3150 but my groups opened back up. From there I went with the best load which was the 66.0 grains at 3050 fps.

Not trying to argue or start something, just looking to do things correctly and still get the performance of a mag cartridge.

 

[Wis65x55]

WT
What kind of velocity standard deviation were you seeing? On a side note, I am wondering if you may see an improvement by switching to powders slower than IMR 4350. Which primer are you using?
Keith

 

[jimbires]

I can't use your cartridge base to ogive measurement in quickload ,so I used the saami spec . I also used the default water capacity . here is a run down on IMR 4350 . it looks like 3000 FPS is where your going to max out .7 rem mag is rated at 61000 psi max . I assumed a 24" bbl .

Cartridge : 7 mm Rem. Mag.(SAAMI)
Bullet : .284, 150, Nosler PART SP 16326
Useable Case Capaci: 75.117 grain H2O = 4.877 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : IMR 4350

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-20.0 74 50.80 2478 2045 34027 9886 94.1 1.515
-18.0 76 52.07 2534 2138 36122 10163 95.0 1.480
-16.0 77 53.34 2590 2234 38332 10430 95.9 1.441
-14.0 79 54.61 2646 2331 40665 10686 96.7 1.401
-12.0 81 55.88 2701 2430 43125 10930 97.4 1.361
-10.0 83 57.15 2756 2530 45721 11160 98.0 1.324
-08.0 85 58.42 2811 2632 48459 11377 98.6 1.288
-06.0 87 59.69 2865 2735 51348 11579 99.0 1.253
-04.0 89 60.96 2920 2839 54397 11766 99.4 1.220 ! Near Maximum !
-02.0 90 62.23 2973 2944 57615 11936 99.7 1.188 ! Near Maximum !
+00.0 92 63.50 3026 3051 61014 12089 99.9 1.157 !DANGEROUS LOAD-DO NOT USE!
+02.0 94 64.77 3079 3158 64604 12226 100.0 1.127 !DANGEROUS LOAD-DO NOT USE!
+04.0 96 66.04 3131 3266 68397 12344 100.0 1.098 !DANGEROUS LOAD-DO NOT USE!
+06.0 98 67.31 3183 3375 72408 12453 100.0 1.070 !DANGEROUS LOAD-DO NOT USE!
+08.0 100 68.58 3234 3484 76652 12560 100.0 1.044 !DANGEROUS LOAD-DO NOT USE!
+10.0 101 69.85 3285 3595 81144 12663 100.0 1.018 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 92 63.50 3130 3264 70762 11710 100.0 1.083 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 92 63.50 2877 2757 51255 12075 96.7 1.253



I'd be looking to use a different powder if I wanted more velocity .

Cartridge : 7 mm Rem. Mag.(SAAMI)
Bullet : .284, 150, Nosler PART SP 16326
Useable Case Capaci: 75.117 grain H2O = 4.877 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length : 24.0 inch = 609.6 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 61000 psi, or 420 MPa
or a maximum loading ratio or filling of 105 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

23 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Alliant Reloder-26 96.1 71.5 4.63 3169 100.0 61000 13751 1.169 !DANGEROUS LOAD-DO NOT USE!
PB Clermont PCL 517 101.9 75.3 4.88 3156 99.3 61000 14124 1.149 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-25 104.9 72.3 4.68 3156 100.0 61000 13400 1.152 !DANGEROUS LOAD-DO NOT USE!
SNPE Vectan SP 12 101.7 75.2 4.87 3156 99.4 61000 14098 1.149 !DANGEROUS LOAD-DO NOT USE!
Norma MRP 97.1 70.2 4.55 3152 100.0 61000 13931 1.162 !DANGEROUS LOAD-DO NOT USE!
Vihtavuori N560 98.9 70.0 4.53 3152 98.6 61000 14341 1.155 !DANGEROUS LOAD-DO NOT USE!
ReloadSwiss RS 70 94.3 69.6 4.51 3149 100.0 61000 13514 1.145 !DANGEROUS LOAD-DO NOT USE!
IMR 7828 SSC 97.8 69.6 4.51 3145 99.0 61000 13920 1.144 !DANGEROUS LOAD-DO NOT USE!
IMR 7828 103.4 69.6 4.51 3145 99.0 61000 13920 1.144 !DANGEROUS LOAD-DO NOT USE!
Accurate MAGPRO 99.2 73.0 4.73 3143 97.5 61000 14443 1.163 !DANGEROUS LOAD-DO NOT USE!
ADI AR 2213 98.8 69.2 4.48 3132 98.9 61000 13790 1.141 !DANGEROUS LOAD-DO NOT USE!
ADI AP 2214 102.8 73.9 4.79 3130 99.2 61000 13638 1.140 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-22 99.1 69.4 4.50 3127 99.6 61000 13765 1.161 !DANGEROUS LOAD-DO NOT USE!
Bofors RP5/NP ~approximation 99.1 69.4 4.50 3127 99.6 61000 13765 1.161 !DANGEROUS LOAD-DO NOT USE!
Raufoss RA15 99.1 69.4 4.50 3127 99.6 61000 13765 1.161 !DANGEROUS LOAD-DO NOT USE!
Winchester WXR 101.8 69.7 4.52 3126 99.5 61000 13783 1.161 !DANGEROUS LOAD-DO NOT USE!
Bofors RP15 101.8 69.7 4.52 3126 99.5 61000 13783 1.161 !DANGEROUS LOAD-DO NOT USE!
Ramshot Magnum 99.1 74.8 4.84 3110 99.9 61000 13184 1.156 !DANGEROUS LOAD-DO NOT USE!
Vihtavuori N570 105.0 76.7 4.97 3099 94.3 54467 15316 1.213 ! Near Maximum !
Bofors RP5 NT ~approximation 102.4 72.3 4.69 3098 97.3 61000 13620 1.144 !DANGEROUS LOAD-DO NOT USE!
Rottweil R905 100.5 69.0 4.47 3098 98.5 61000 13484 1.159 !DANGEROUS LOAD-DO NOT USE!
ADI AR 2209 95.7 65.9 4.27 3090 99.5 61000 13078 1.147 !DANGEROUS LOAD-DO NOT USE!
Bofors RP30 105.0 72.7 4.71 3088 98.8 56755 14175 1.204 ! Near Maximum !
Norma MRP 2 105.0 72.7 4.71 3088 98.8 56755 14175 1.204 ! Near Maximum !
Alliant Reloder-19 96.2 66.6 4.32 3087 99.5 61000 13134 1.155 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-23 101.4 68.7 4.45 3086 100.0 61000 12390 1.170 !DANGEROUS LOAD-DO NOT USE!
Bofors RP14 ~approximation 96.9 67.1 4.35 3080 99.5 61000 13043 1.156 !DANGEROUS LOAD-DO NOT USE!
Ramshot Hunter 91.8 65.6 4.25 3076 100.0 61000 12647 1.162 !DANGEROUS LOAD-DO NOT USE!
ReloadSwiss RS 62 90.3 65.5 4.25 3072 100.0 61000 12413 1.177 !DANGEROUS LOAD-DO NOT USE!
Hodgdon H4831 SC 97.5 68.3 4.42 3066 98.3 61000 13014 1.152 !DANGEROUS LOAD-DO NOT USE!
Hodgdon H4831 101.4 68.3 4.42 3066 98.3 61000 13014 1.152 !DANGEROUS LOAD-DO NOT USE!
Norma 204 91.4 65.3 4.23 3066 99.4 61000 12823 1.154 !DANGEROUS LOAD-DO NOT USE!
Raufoss RA4 94.3 65.3 4.23 3066 99.4 61000 12823 1.154 !DANGEROUS LOAD-DO NOT USE!
Bofors RP4 ~approximation 94.3 65.3 4.23 3066 99.4 61000 12823 1.154 !DANGEROUS LOAD-DO NOT USE!
Norma URP 91.4 62.6 4.05 3053 100.0 61000 12114 1.168 !DANGEROUS LOAD-DO NOT USE!
Bofors RP19 ~approximation 91.4 62.6 4.06 3052 100.0 61000 12111 1.168 !DANGEROUS LOAD-DO NOT USE!
Somchem S365 93.0 64.1 4.15 3052 100.0 61000 11754 1.176 !DANGEROUS LOAD-DO NOT USE!
Somchem S385 96.3 67.4 4.37 3047 99.8 61000 12543 1.175 !DANGEROUS LOAD-DO NOT USE!
Accurate 4350 90.5 62.7 4.06 3047 100.0 61000 12085 1.187 !DANGEROUS LOAD-DO NOT USE!
Winchester Supreme 780 95.1 69.4 4.50 3041 99.5 61000 12507 1.161 !DANGEROUS LOAD-DO NOT USE!
Rottweil R904 95.2 65.0 4.21 3040 98.8 61000 12548 1.154 !DANGEROUS LOAD-DO NOT USE!
Bofors RP4 NT ~approximation 92.0 64.7 4.19 3039 99.9 61000 12321 1.167 !DANGEROUS LOAD-DO NOT USE!
IMR 4831 95.8 63.6 4.12 3034 100.0 61000 11860 1.177 !DANGEROUS LOAD-DO NOT USE!
Vihtavuori N165 101.5 69.5 4.51 3034 99.7 61000 12276 1.166 !DANGEROUS LOAD-DO NOT USE!
Accurate 3100 99.3 68.8 4.46 3030 100.0 61000 12152 1.192 !DANGEROUS LOAD-DO NOT USE!
Lovex S071 105.0 68.8 4.46 3030 100.0 60976 12152 1.192 !DANGEROUS LOAD-DO NOT USE!
ADI AR 2217 105.0 71.9 4.66 3027 98.3 54930 13327 1.196 ! Near Maximum !
Hodgdon H1000 105.0 71.9 4.66 3027 98.3 54930 13327 1.196 ! Near Maximum !
Lovex S070 91.3 62.5 4.05 3024 100.0 61000 12103 1.173 !DANGEROUS LOAD-DO NOT USE!
Vihtavuori N160 101.7 67.5 4.37 3022 98.8 61000 12323 1.158 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-33 105.0 78.9 5.11 3015 93.5 50824 14841 1.255
Hodgdon Hybrid 100V 93.8 62.8 4.07 3008 100.0 61000 11203 1.169 !DANGEROUS LOAD-DO NOT USE!
Somchem S361 94.3 69.6 4.51 3007 98.3 61000 12312 1.166 !DANGEROUS LOAD-DO NOT USE!
Lovex S065 90.4 61.2 3.97 3001 100.0 61000 11631 1.172 !DANGEROUS LOAD-DO NOT USE!
ADI AR 2225 105.0 73.1 4.74 2975 99.5 48523 13794 1.274
Hodgdon Retumbo 105.0 73.1 4.74 2975 99.5 48523 13794 1.274
ReloadSwiss RS 80 105.0 78.9 5.11 2966 93.3 48278 14640 1.283
ADI AR 2218 105.0 77.5 5.02 2945 91.0 47915 14836 1.274
Lovex D100 105.0 78.2 5.07 2926 89.0 55364 12667 1.216 ! Near Maximum !
Vihtavuori 24N41 105.0 77.5 5.02 2900 86.2 50599 13195 1.252
Norma 217 105.0 71.6 4.64 2881 97.9 43374 13862 1.361
Vihtavuori N170 105.0 71.9 4.66 2862 91.3 50375 12606 1.284
Hodgdon H870 105.0 75.1 4.87 2853 92.4 43384 13926 1.355
Alliant Reloder-50 105.0 78.6 5.10 2811 88.9 41339 14188 1.408
Bofors 12,7mmRA NC1214 Lot20115087 105.0 76.9 4.98 2753 80.7 43383 13099 1.406
Hodgdon US 869 105.0 77.5 5.02 2701 82.0 41377 12261 1.388
Hodgdon 50BMG 105.0 73.8 4.78 2700 77.7 41526 12221 1.383
SNPE Vectan SP 13 105.0 74.3 4.81 2647 86.4 38058 12074 1.450
Accurate 8700 105.0 75.9 4.92 2621 85.2 37196 12008 1.455
Vihtavuori 20N29 105.0 78.2 5.07 2596 81.8 36026 12046 1.487
PB Clermont PCL 513/520/9520 105.0 74.3 4.81 2580 83.2 35733 11706 1.490
NC A3502 ,test only 105.0 71.1 4.61 2376 58.6 32914 9119 1.534
TLP A 502(RH) ,test only 105.0 71.1 4.61 2352 63.3 30989 9595 1.577
V1734 7-multiperf ,test only 105.0 71.1 4.61 1690 29.0 17125 4485 2.037

 

[Elkman]

With H-4350 my most accurate load is 61 grains, with a AOL of 3.280 using a 162 gr Hornady BTSP, CCI primers.
Recently I have been having great success with 71 gr. of H-1000, seated to the same depth with a 160 AB, and CCI primer. This load will be my hunting load and shoots MOA out to 600 yards. My accuracy increased dramatically when I went below the industry standard of 3.290

 

[MAinAR]

RL 26 is hard to beat in the 7RM. I am at 3,200fps with 140 AB
OAL 3.26"
Fed 215M
RL26 @ 71 grains.........

 

[HTDUCK]

Got any RL22 or H1000 ?

 

[joelkdouglas]

I can't use your cartridge base to ogive measurement in quickload ,so I used the saami spec . I also used the default water capacity . here is a run down on IMR 4350 . it looks like 3000 FPS is where your going to max out .7 rem mag is rated at 61000 psi max . I assumed a 24" bbl .

Interesting that QL and the Nosler manual are so different on max pressure and velocity. I wouldn't be surprised by 100 fps but 250 is a good amount.


Sent from my iPhone using Tapatalk

 

[wisconsinteacher]

Okay, I just looked and have some RL22 and RL25 on hand. What one would you try first with the 150 Partition?

 

[HTDUCK]

I've had very good speeds and accuracy with RL22 in the 7RM
I have some RL but have never used it for anything.

 

[OU812]

RL-22 is magic in a 7mm with 160 grains, being lit by Fed 215's, might do well with 150's. Primer swapping can do wonders for groups.

 

[jimbires]

I can't use your cartridge base to ogive measurement in quickload ,so I used the saami spec . I also used the default water capacity . here is a run down on IMR 4350 . it looks like 3000 FPS is where your going to max out .7 rem mag is rated at 61000 psi max . I assumed a 24" bbl .

Interesting that QL and the Nosler manual are so different on max pressure and velocity. I wouldn't be surprised by 100 fps but 250 is a good amount.


Sent from my iPhone using Tapatalk

some of these books are very optimistic on velocity .

 

[jimbires]

Okay, I just looked and have some RL22 and RL25 on hand. What one would you try first with the 150 Partition?

I also have good results with RL22 and a 160 AccuBond . RL 22 has a bad reputation for being temp sensitive . I bought a pound of RL26 to try in my 7 rem mag , it's supposed to be fairly stable . time will tell .


with a 150 gr bullet RL25 will get you 3156 FPS max at a case fill of 104.9 % this is about as full of a case as I like to use .

RL22 will give 3127FPS with a case fill of 99.1% this would be a full case with no problems of a compressed load .


if you have these ;
IMR7828ssc and RL26 , both of these would be worth a look

 

[preacher]

I tried some R26 with my last 7mm Mag workup, using 160gr bullets. I got very good velocity and super accuracy. As I understand it, it is supposed to be "about like" R25 but more temp stable. Admittedly, I've only had temperature problems with R22 in one cartridge, a 280 Improved (61gr) using the 150BT and it was on a hot day. I had worked that load up here in Utah during the late summer and early Fall ( maybe 65 deg was the hottest) That late Fall I shot antelope at around 50deg in WY. I also shot antelope doe here in Utah that December right at 32 deg, no problem. However, I went to Texas in February and shot a Corsican Ram about 90 deg. The bolt handle was super stiff, so was extraction and primers were supper flat with the Evil ejector button shiny spot! I still use R22 a lot, but if I plan a hot weather hunt I start all over with it during our summertime, ha! I've had grief with R19 slowing way down in cold weather, enough to open my groups about 4 inches, in a 338 winmag. In a 240 Weatherby it was super! So, as along as you won't use them in hotter weather than you have "right now" during your workup, I'd go with the R22 first. It may not matter, but I'd bet that R25 would do better with the 160's or heavier. I don't personally think you can beat either the 150BT or the 150PT for any sized deer in a 7mm Rem Mag, so give it a go Pard! I bet you can get way better than 1", "not that 1" is bad"! Good luck to you.

 

[baltz526]

66.0 grains for IMR4350 with the 150 Partition showed the best groups so I started seating deeper and this is what I shot today. Speeds were around 3050 fps.

2.722" ogive- 1.232"
2.711" ogive- 1.077"
2.702" ogive- 1.277"



Would you keep seating deeper or just load up some rounds and take the rifle hunting and live with 1.25 MOA?

I would look at these groups and think. Crap! 4350 is not working.

 

[OU812]

66.0 grains for IMR4350 with the 150 Partition showed the best groups so I started seating deeper and this is what I shot today. Speeds were around 3050 fps.

2.722" ogive- 1.232"
2.711" ogive- 1.077"
2.702" ogive- 1.277"



Would you keep seating deeper or just load up some rounds and take the rifle hunting and live with 1.25 MOA?

I would look at these groups and think. Crap! 4350 is not working.

I wouldn't count the 4350 out just yet until different primers were tried. My 06 shot poorly with IMR-4350, 165's and WRL primers but it's a rock star with same load and fed 210's. YMMV