7mm RM Quickload Request

Joec7651

Handloader
Apr 7, 2019
583
307
Would someone be kind enough to run some Quickload numbers for me? I would greatly appreciate it.

7mm Rem Mag
IMR 4831
139gr SST and 140gr Ballistic Tip
COAL 3.250”
26” barrel

I’m going to come up with a deer load for a long power line. Kind of a generic load to be used in 2 of my 7mm RM’s. I’ve read that IMR 4831 has one of the lowest flame temps for suitable 7mm RM powders, 3720 if memory serves correctly, and is a very accurate performer in 7mm RM.

FYI: Varget and Vihtavouri 500 series double base powders seem the hardest on a throat burning between 4000 and 4100 for flame temps.

It does great in my 270 and after looking at my stocks I have 17 lbs of it. It appears I’ve developed quite the hoarding condition regarding powder, primers, and brass for years now.
 

DrMike

Ballistician
Nov 8, 2006
35,465
2,240
Code:
Cartridge          : 7 mm Rem. Mag.(SAAMI)
Bullet             : .284, 140, Nosler BalTip 28140
Useable Case Capaci: 74.108 grain H2O = 4.812 cm³
Cartridge O.A.L. L6: 3.250 inch = 82.55 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : IMR 4831

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   88    57.42   2898    2611   44334  10116     99.7    1.386
-09.0   89    58.06   2927    2662   45720  10188     99.8    1.367
-08.0   90    58.70   2955    2715   47147  10255     99.9    1.347
-07.0   91    59.33   2983    2767   48615  10317    100.0    1.328
-06.0   92    59.97   3012    2819   50126  10374    100.0    1.309
-05.0   93    60.61   3040    2872   51681  10427    100.0    1.291
-04.0   94    61.25   3067    2925   53281  10479    100.0    1.273  ! Near Maximum !
-03.0   95    61.89   3095    2978   54928  10529    100.0    1.255  ! Near Maximum !
-02.0   96    62.52   3122    3031   56624  10579    100.0    1.238  ! Near Maximum !
-01.0   97    63.16   3150    3084   58369  10629    100.0    1.221  ! Near Maximum !
+00.0   98    63.80   3177    3137   60167  10678    100.0    1.204  ! Near Maximum !
+01.0   98    64.44   3204    3191   62017  10726    100.0    1.188  !DANGEROUS LOAD-DO NOT USE!
+02.0   99    65.08   3231    3245   63923  10773    100.0    1.172  !DANGEROUS LOAD-DO NOT USE!
+03.0  100    65.71   3257    3298   65886  10820    100.0    1.156  !DANGEROUS LOAD-DO NOT USE!
+04.0  101    66.35   3284    3353   67908  10866    100.0    1.141  !DANGEROUS LOAD-DO NOT USE!
+05.0  102    66.99   3310    3407   69992  10911    100.0    1.126  !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     98    63.80   3279    3343   71211  10318    100.0    1.121  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     98    63.80   3021    2837   49128  11030     98.9    1.317
 

DrMike

Ballistician
Nov 8, 2006
35,465
2,240
Code:
Cartridge          : 7 mm Rem. Mag.(SAAMI)
Bullet             : .284, 139, Hornady SST InterLock 28202
Useable Case Capaci: 74.649 grain H2O = 4.847 cm³
Cartridge O.A.L. L6: 3.250 inch = 82.55 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : IMR 4831

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   87    57.42   2892    2582   43556  10134     99.6    1.394
-09.0   88    58.06   2921    2633   44911  10208     99.7    1.374
-08.0   89    58.70   2950    2685   46305  10278     99.8    1.354
-07.0   90    59.33   2978    2737   47739  10343     99.9    1.335
-06.0   91    59.97   3006    2789   49214  10403    100.0    1.317
-05.0   92    60.61   3034    2841   50732  10459    100.0    1.298
-04.0   93    61.25   3062    2894   52294  10511    100.0    1.280  ! Near Maximum !
-03.0   94    61.89   3090    2946   53902  10562    100.0    1.262  ! Near Maximum !
-02.0   95    62.52   3117    2999   55556  10613    100.0    1.245  ! Near Maximum !
-01.0   96    63.16   3145    3052   57259  10662    100.0    1.228  ! Near Maximum !
+00.0   97    63.80   3172    3105   59011  10712    100.0    1.211  ! Near Maximum !
+01.0   98    64.44   3199    3158   60815  10760    100.0    1.195  !DANGEROUS LOAD-DO NOT USE!
+02.0   99    65.08   3226    3211   62672  10808    100.0    1.179  !DANGEROUS LOAD-DO NOT USE!
+03.0  100    65.71   3252    3265   64584  10855    100.0    1.163  !DANGEROUS LOAD-DO NOT USE!
+04.0  101    66.35   3279    3318   66554  10901    100.0    1.147  !DANGEROUS LOAD-DO NOT USE!
+05.0  102    66.99   3306    3372   68582  10947    100.0    1.132  !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     97    63.80   3276    3312   69854  10349    100.0    1.127  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     97    63.80   3014    2803   48182  11040     98.8    1.325
 

seokladuckin

Beginner
Mar 21, 2021
198
2
Try some with RL-22.

every 7mag I've tried it in shot very well

This was 63.5 grains
1fbdc4fc10367e77f95240fe1f10efd4.jpg


Sent from my SM-G975U1 using Tapatalk
 

Joec7651

Handloader
Apr 7, 2019
583
307
Good shooting there! I have RL22, 23, 25, and 26 but have read where many people have gotten great results with accuracy and velocity using IMR 4831. It’s a basic single base powder with low flame temp, that always seems to perform well in just about everything it’s applicable to. Essentially I’ve got it in my head to see how it will perform.

I’ll use it as a deer load in a 24” 9 twist 7RM, and possibly in another with a 26” 8 twist. The 1:8 rifle shoots 175gr ELD-X’s lights out so we will see how it performs in that one.

I don’t need to work up another load. 160gr Hot-Cor’s always serve me well in 7RM’s for deer and black bear. Just want to see what I can make it do.
 

ReloadKy

Handloader
May 13, 2020
263
116
Joe I have gotten excellent accuracy using IMR 4831 in my Tikka 7 Mag. For bullets to go with that powder I have 140gr SGK, 150,162gr ELDX, 150 gr Partitions, 120,140gr Nosler Ballistic tips. All of the aforementioned bullets shot sub moa with IMR 4831 in my rifle. I did not get the speeds with IMR 4831 (I am not a speed freak by any means just had a goal in mind that I wanted to acheive with that rifle) that I get with RL 23 but the accuracy is phenomenal. If you are sitting on 17 lbs of IMR 4831 I would definitely try to find some loads to use it!! Good luck.
 

SJB358

Ballistician
Dec 24, 2006
31,398
757
Good luck Joe. I can’t see you not getting good loads if it agrees with your rifle. 7 Rems I’ve been around don’t seem to fussy and those 139’s should hurt bucks pretty bad!
 
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