7mm Remington mag.

salmonchaser

Handloader
Dec 13, 2013
3,441
777
Im loading for a friend, he has an old 7mm Remington mag. I have Rl. 26 and H1000 available, with 160 grain tsx, bullets. Hoping for a quickload to find a perfect load.
Thanks in advance.
 

TackDriver284

Handloader
Feb 13, 2016
1,794
470
Used a 24 inch barrel length, if you have any H20, OAL , etc info, I could crunch it further for you.

Code:
Cartridge          : 7 mm Rem. Mag.(SAAMI)
Bullet             : .284, 160, Barnes 'TSX' 30291
Useable Case Capaci: 72.196 grain H2O = 4.688 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Hodgdon H1000 *T

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   96    63.00   2648    2492   40502  11817     94.7    1.421
-09.0   97    63.70   2681    2555   41942  11967     95.3    1.397
-08.0   98    64.40   2715    2618   43439  12111     95.9    1.374
-07.0   99    65.10   2748    2683   44994  12249     96.4    1.351
-06.0  100    65.80   2782    2749   46609  12382     96.9    1.328
-05.0  101    66.50   2815    2815   48296  12507     97.3    1.306
-04.0  102    67.20   2849    2883   50050  12626     97.7    1.284
-03.0  103    67.90   2882    2951   51875  12739     98.1    1.263  ! Near Maximum !
-02.0  104    68.60   2916    3020   53776  12844     98.5    1.241  ! Near Maximum !
-01.0  105    69.30   2949    3090   55757  12941     98.8    1.221  ! Near Maximum !
+00.0  106    70.00   2983    3160   57822  13031     99.1    1.200  ! Near Maximum !
+01.0  107    70.70   3016    3232   59977  13113     99.3    1.180  ! Near Maximum !
+02.0  108    71.40   3050    3304   62223  13187     99.5    1.161  !DANGEROUS LOAD-DO NOT USE!
+03.0  110    72.10   3083    3377   64572  13252     99.7    1.141  !DANGEROUS LOAD-DO NOT USE!
+04.0  111    72.80   3116    3450   67023  13309     99.8    1.122  !DANGEROUS LOAD-DO NOT USE!
+05.0  112    73.50   3150    3524   69586  13357     99.9    1.103  !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    106    70.00   3135    3493   70678  12567    100.0    1.104  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    106    70.00   2768    2722   46761  12635     92.6    1.324
 

TackDriver284

Handloader
Feb 13, 2016
1,794
470
Code:
Cartridge          : 7 mm Rem. Mag.(SAAMI)
Bullet             : .284, 160, Barnes 'TSX' 30291
Useable Case Capaci: 72.196 grain H2O = 4.688 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-26 *C

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   86    61.20   2737    2661   41473  12544     99.7    1.434
-09.0   86    61.88   2768    2722   42967  12635     99.8    1.410
-08.0   87    62.56   2799    2784   44519  12717     99.9    1.387
-07.0   88    63.24   2830    2846   46138  12791    100.0    1.364
-06.0   89    63.92   2861    2909   47817  12855    100.0    1.342
-05.0   90    64.60   2892    2972   49549  12916    100.0    1.320
-04.0   91    65.28   2923    3035   51337  12975    100.0    1.299
-03.0   92    65.96   2953    3098   53185  13033    100.0    1.278  ! Near Maximum !
-02.0   93    66.64   2983    3162   55100  13091    100.0    1.258  ! Near Maximum !
-01.0   94    67.32   3013    3226   57083  13147    100.0    1.238  ! Near Maximum !
+00.0   95    68.00   3043    3291   59138  13202    100.0    1.218  ! Near Maximum !
+01.0   96    68.68   3073    3355   61267  13256    100.0    1.199  !DANGEROUS LOAD-DO NOT USE!
+02.0   97    69.36   3103    3421   63474  13309    100.0    1.180  !DANGEROUS LOAD-DO NOT USE!
+03.0   98    70.04   3132    3486   65762  13361    100.0    1.161  !DANGEROUS LOAD-DO NOT USE!
+04.0   99    70.72   3162    3552   68134  13412    100.0    1.143  !DANGEROUS LOAD-DO NOT USE!
+05.0  100    71.40   3191    3618   70595  13462    100.0    1.125  !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     95    68.00   3169    3569   73640  12690    100.0    1.115  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     95    68.00   2848    2882   45503  13694     98.7    1.358
 

Bruce Mc

Handloader
Oct 26, 2005
1,030
70
H-1000 was specifically designed for 1000 yd match shooting with the magnum cartridges. It is temperature stable and gives excellent accuracy in the 7 rem mag. It doesn't yield top velocity compared to Re-26. My 7mm Rem load is 160 Nosler AB and H-1000 and have shot several 1/4" and several smaller three shot groups
 

salmonchaser

Handloader
Dec 13, 2013
3,441
777
I've used Rl22 in several 7mm, I agree it's just about perfect. But I'm out. I have a good supply of 1000 and 26, and like both of those equally in my 338 Jarrett. I think I'm just flipping a coin😁
 

DrMike

Ballistician
Nov 8, 2006
35,184
1,726
H1000 was one of the go-to propellants when loading commercially. It was most dependable in the 7RM, always producing reasonable velocities and fine accuracy in a variety of rifles.
 
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