7mm-300 wby help

Got a rem 700 rebarreled to 7mm-300 wby from a guy to work on before hunting season. I've never worked with one but isn't it about identical to the STW? Was thinking of starting in middle range of stw loads for a starting point.

He gave me remington brass and I recomended 160 ABs over the partitions he was using. He was also using 7828 last time at 82g I believe but was having serious pressure signs on the brass and was splitting necks on few, from what I seen anyway. I recomended retumbo, but the store was out so I picked close 2nd choice of H1000. CCI 250 primers will light the fire...

Anyone with 7mm-300 wby out there or worked with one let me know and what I can expect. Barrel is 26" or 27" douglass xx, leupold vari x III 3.5-10x40.

I was thinking 3200 with the 160 AB would be about right with good accuracy, well see.

Maybe a QL prediction with H1000 and 160 AB would be helpful as well.

Thanks.

Cartridge : 7 mm-300 Weath. Mag.
Bullet : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 87.435 grain H2O = 5.677 cm³
Cartridge O.A.L. L6: 3.560 inch = 90.42 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Hodgdon H1000

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 81 64.80 2525 2266 31252 11138 93.1 1.683
-18.0 83 66.42 2592 2386 33448 11485 94.4 1.640
-16.0 85 68.04 2658 2510 35802 11814 95.6 1.598
-14.0 87 69.66 2724 2637 38330 12121 96.6 1.549
-12.0 89 71.28 2791 2767 41045 12404 97.6 1.499
-10.0 91 72.90 2857 2900 43965 12662 98.3 1.451
-08.0 93 74.52 2923 3036 47103 12892 99.0 1.404
-06.0 96 76.14 2989 3175 50488 13093 99.4 1.359
-04.0 98 77.76 3055 3315 54135 13263 99.8 1.316
-02.0 100 79.38 3120 3458 58071 13400 100.0 1.274 ! Near Maximum !
+00.0 102 81.00 3184 3602 62324 13505 100.0 1.234 ! Near Maximum !
+02.0 104 82.62 3248 3748 66926 13597 100.0 1.195 !DANGEROUS LOAD-DO NOT USE!
+04.0 106 84.24 3311 3896 71911 13684 100.0 1.158 !DANGEROUS LOAD-DO NOT USE!
+06.0 108 85.86 3374 4045 77307 13766 100.0 1.122 !DANGEROUS LOAD-DO NOT USE!
+08.0 110 87.48 3437 4196 83127 13843 100.0 1.087 !DANGEROUS LOAD-DO NOT USE!
+10.0 112 89.10 3499 4350 89432 13914 100.0 1.053 !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 102 81.00 3314 3902 75970 12973 100.0 1.139 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 81.00 2989 3174 50081 13672 97.0 1.358


Cartridge : 7 mm-300 Weath. Mag.
Bullet : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 87.435 grain H2O = 5.677 cm³
Cartridge O.A.L. L6: 3.560 inch = 90.42 mm
Barrel Length : 26.0 inch = 660.4 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 55839 psi, or 385 MPa
or a maximum loading ratio or filling of 110 %
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 !

46 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
--------------------------------- -----------------------------------------------------------------
Vihtavuori N570 97.8 83.1 5.39 3161 97.6 55840 15588 1.318 ! Near Maximum !
Alliant Reloder 33 97.7 86.5 5.61 3146 98.2 55840 15343 1.323 ! Near Maximum !
Alliant Reloder-50 104.2 90.9 5.89 3141 97.5 55840 15744 1.350 ! Near Maximum !
Hodgdon H870 103.9 86.5 5.61 3139 98.9 55840 15069 1.324 ! Near Maximum !
Hodgdon Retumbo 101.4 82.1 5.32 3132 100.0 55840 13706 1.308 ! Near Maximum !
Ramshot Magnum 92.1 79.4 5.15 3099 99.9 55840 13796 1.315 ! Near Maximum !
Norma MRP 2 96.8 78.0 5.05 3096 99.9 55840 13965 1.330 ! Near Maximum !
IMR 7828 93.5 73.2 4.75 3089 99.7 55840 13578 1.303 ! Near Maximum !
Hodgdon H1000 98.4 78.5 5.09 3084 99.9 55840 13328 1.297 ! Near Maximum !
Alliant Reloder-25 94.6 75.8 4.91 3083 100.0 55840 12930 1.317 ! Near Maximum !
Vihtavuori 20N29 108.8 94.4 6.11 3078 95.2 55840 14619 1.328 ! Near Maximum !
Vihtavuori 24N41 101.0 86.7 5.62 3068 92.6 55840 14290 1.303 ! Near Maximum !
Winchester WXR 92.0 73.4 4.75 3067 100.0 55840 13362 1.320 ! Near Maximum !
Hodgdon 50BMG 106.2 86.9 5.63 3062 88.8 55840 14546 1.313 ! Near Maximum !
Hodgdon US 869 106.0 91.0 5.90 3057 92.7 55840 14336 1.319 ! Near Maximum !
Accurate 8700 110.0 90.8 5.88 3056 96.9 54061 14156 1.329
Rottweil R905 91.0 72.8 4.72 3048 99.5 55840 13195 1.317 ! Near Maximum !
Hodgdon H4831 92.2 72.2 4.68 3021 99.3 55840 12782 1.306 ! Near Maximum !
Vihtavuori N170 101.1 80.6 5.22 3013 96.3 55840 13374 1.331 ! Near Maximum !
Vihtavuori N165 92.2 73.5 4.76 2983 100.0 55840 11937 1.323 ! Near Maximum !
Vihtavuori N160 92.5 71.4 4.63 2979 99.6 55840 12083 1.310 ! Near Maximum !
Accurate 3100 95.1 72.5 4.70 2972 100.0 55840 11762 1.353 ! Near Maximum !

It looks as if there are a few other powders that may boost velocity somewhat, if speed is what you're looking for. I've been having great success with N570 is overbore cartridges.

Cartridge : 7 mm-300 Weath. Mag.
Bullet : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 87.435 grain H2O = 5.677 cm³
Cartridge O.A.L. L6: 3.560 inch = 90.42 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N570

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 81 68.80 2547 2305 30547 12309 86.5 1.719
-18.0 83 70.52 2620 2438 32797 12774 88.2 1.675
-16.0 85 72.24 2692 2575 35227 13225 89.8 1.632
-14.0 87 73.96 2766 2717 37851 13659 91.4 1.584
-12.0 89 75.68 2839 2864 40686 14074 92.8 1.530
-10.0 91 77.40 2913 3015 43755 14468 94.1 1.478
-08.0 93 79.12 2987 3171 47079 14836 95.3 1.428
-06.0 95 80.84 3062 3331 50662 15178 96.4 1.380
-04.0 97 82.56 3136 3494 54494 15490 97.3 1.333 ! Near Maximum !
-02.0 99 84.28 3211 3662 58621 15770 98.1 1.289 ! Near Maximum !
+00.0 101 86.00 3285 3833 63071 16016 98.8 1.246 ! Near Maximum !
+02.0 103 87.72 3359 4008 67873 16226 99.3 1.204 !DANGEROUS LOAD-DO NOT USE!
+04.0 105 89.44 3432 4185 73062 16397 99.7 1.164 !DANGEROUS LOAD-DO NOT USE!
+06.0 107 91.16 3505 4366 78677 16528 99.9 1.126 !DANGEROUS LOAD-DO NOT USE!
+08.0 109 92.88 3578 4549 84760 16616 100.0 1.089 !DANGEROUS LOAD-DO NOT USE!
+10.0 111 94.60 3650 4734 91363 16676 100.0 1.053 !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 101 86.00 3465 4265 78158 15518 100.0 1.136 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 101 86.00 3034 3270 48894 15453 91.9 1.391

Cartridge : 7 mm-300 Weath. Mag.
Bullet : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 87.435 grain H2O = 5.677 cm³
Cartridge O.A.L. L6: 3.560 inch = 90.42 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Hodgdon Retumbo

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 83 67.60 2560 2328 30597 11960 96.5 1.707
-18.0 86 69.29 2628 2453 32777 12289 97.6 1.663
-16.0 88 70.98 2696 2582 35120 12586 98.5 1.621
-14.0 90 72.67 2764 2714 37641 12846 99.2 1.575
-12.0 92 74.36 2831 2848 40354 13068 99.7 1.523
-10.0 94 76.05 2898 2984 43274 13250 99.9 1.473
-08.0 96 77.74 2964 3121 46423 13390 100.0 1.425
-06.0 98 79.43 3029 3260 49818 13515 100.0 1.379
-04.0 100 81.12 3094 3401 53488 13635 100.0 1.334
-02.0 102 82.81 3158 3542 57452 13752 100.0 1.291 ! Near Maximum !
+00.0 104 84.50 3221 3685 61743 13863 100.0 1.250 ! Near Maximum !
+02.0 106 86.19 3283 3830 66390 13970 100.0 1.211 !DANGEROUS LOAD-DO NOT USE!
+04.0 108 87.88 3345 3976 71435 14072 100.0 1.172 !DANGEROUS LOAD-DO NOT USE!
+06.0 111 89.57 3407 4124 76876 14169 100.0 1.136 !DANGEROUS LOAD-DO NOT USE!
+08.0 113 91.26 3468 4274 82743 14261 100.0 1.100 !DANGEROUS LOAD-DO NOT USE!
+10.0 115 92.95 3530 4426 89087 14346 100.0 1.066 !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 104 84.50 3347 3980 76847 13363 100.0 1.148 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 84.50 3025 3250 48587 14476 99.4 1.386

Thank you sir!!

Jorey,

Nice find.
I am thinking its a 7 STW with the Wby double radius shoulder.

JD338

Very close Jim!

Rem 25-06,
You are correct, the 7mm/300Wby is about identical to the 7STW. I shot and hunted with one for 12 years.
Mine loved 77 gr Reloader 22 (safe in that rifle) under 160 gr Partitions. Velocity was 3300 fps. Consistent
3/4" groups. I currently shoot a 7STW and it also likes 77 gr Reloader 22 under 160 gr AccuBonds. Velocity
is the same at 3300 fps out of a 26" barrel. Load data should be the same in these cartridges.

That is scootin a 160 right there! 3200 with a 160 AB!

If he is splitting necks with his cases, it might not hurt to anneal them. Soften them back up so you don't lose anymore cases. Takes about 10 minutes to do 40-50 cases once you get the timing down.

Post up some pictures of that rig. I have always wanted a Mashburn or similar 7mm. Too many Bob Hagel books..

Had a 257/300Wby and 7mm/300wby, find your load quick and don't do a lot of range shooting, saving your throat for hunting purposes. Your barrel life will not be long, so keep your rounds down. 257/300Wby throat was gone in just over 450 rounds and the 7mm/300wby was gone in just at 800 rounds. Outstanding killers on game but don't ware out the gun doing all kinds of load work like I did. :mrgreen:

I'm shooting 82 gr of retumbo, cci 250s, and 160 accubonds in Remington brass. Mine is shooting .75-1" between 3300-3350fps. My rifle is built on an old sako action so work up slow

jdj, you may want to look at the .284 Baer similar to a 7stw improved but it uses a 30 degree shoulder and other refinements. my Smith in billings has built several and they shoot quite well. Redding makes the dies and should have them in stock.

I am using 81 grains of H-1000 in my STW. It likes the Barnes TSX for best accuracy. For the 175 PT it likes 77gr of H-1000 but this load is fairly mild.

Let us know how close we were Jorey.

I have a custom built Rem M700 with a 26 " Shillen match grade 1-9 twist barrel and it to is chambered in 7 x 300 Bee and i have only shot 20 rounds out of it to break in the barrel and fire form some brass ! - it shot 3200 fps with a MILD load of H1000 and 160 gr bullets ! I guess i should get at shooting it too ! :grin: RJ

Haven't got a chance to shoot yet but I started at 77g and went up to 81g of H1000 with the 160 AB. His barrel is 27" douglass.

Its not my rifle, just a friend of mines that wanted some good shells loaded up and sighted in properly.

I'm kinda excited see what it will do in comparison to STWs and my 7 RUM anyway.

Keep ya guys posted!

YES please do - i am interested in your loads -may save me some time and money with load development ! :grin:

Cheers RJ

Decided to go with 81g of H1000 under the 160 AB. Was doing 3/4" at 100 yards, 3250fps. Put a 300 yard zero on it and that group measured 2.5" so she's ready to rock and roll.

Very nice, Jorey. You are indeed ready to go.

Yep, that'll do it!

remingtonman_25_06":2767n605 said:

Decided to go with 81g of H1000 under the 160 AB. Was doing 3/4" at 100 yards, 3250fps. Put a 300 yard zero on it and that group measured 2.5" so she's ready to rock and roll.

Click to expand...

Hi ! Have you done any more loading and shooting of your 7-300 Bee yet :?: - if so what are the results please ! Thks :grin: RJ