7 Rem Mag - RL22 Update

OleBud

Beginner
Jul 29, 2022
17
15
Loaded 3 more of the 66.4 grain loads under the 162 Grain ELDX and shot one group, no chrono since it’s sketchy. Just accuracy. Cold
Barrel 3 shot group was .530 at 100. I still plan to tinker a bit more, but this ain’t bad! Thanks again for all the Sage advice!!!!
 

DrMike

Ballistician
Nov 8, 2006
35,482
2,275
Well, there is nothing to complain about the accuracy that you are getting.

Code:
Cartridge          : 7 mm Rem. Mag.(SAAMI)
Bullet             : .284, 162, Hornady ELD-X 2840 G7
Useable Case Capaci: 72.032 grain H2O = 4.677 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Alliant Reloder-22 *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   89    59.76   2650    2526   44260  13400     96.6    1.332
-09.0   90    60.42   2680    2584   45736  13554     97.0    1.312
-08.0   91    61.09   2710    2642   47259  13702     97.4    1.291
-07.0   92    61.75   2741    2702   48833  13846     97.8    1.271
-06.0   93    62.42   2771    2762   50457  13983     98.1    1.251
-05.0   94    63.08   2801    2822   52135  14115     98.4    1.232  ! Near Maximum !
-04.0   95    63.74   2831    2883   53868  14241     98.7    1.213  ! Near Maximum !
-03.0   96    64.41   2861    2945   55659  14361     99.0    1.195  ! Near Maximum !
-02.0   97    65.07   2891    3007   57509  14475     99.2    1.177  ! Near Maximum !
-01.0   98    65.74   2921    3070   59420  14582     99.4    1.159  ! Near Maximum !
+00.0   99    66.40   2951    3133   61395  14683     99.6    1.141  !DANGEROUS LOAD-DO NOT USE!
+01.0  100    67.06   2981    3197   63437  14777     99.7    1.124  !DANGEROUS LOAD-DO NOT USE!
+02.0  101    67.73   3011    3261   65548  14864     99.8    1.107  !DANGEROUS LOAD-DO NOT USE!
+03.0  102    68.39   3040    3325   67731  14944     99.9    1.090  !DANGEROUS LOAD-DO NOT USE!
+04.0  103    69.06   3070    3390   69989  15017    100.0    1.074  !DANGEROUS LOAD-DO NOT USE!
+05.0  104    69.72   3099    3456   72325  15082    100.0    1.058  !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     99    66.40   3083    3419   73870  14201    100.0    1.053  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     99    66.40   2764    2748   49171  14446     94.8    1.258

QuickLoad would suggest that you are tickling the dragon's tail. However, I would likely not be concerned in my own firing system about such a load since the indication is that the load generates only a skosh over 61K psi maximum chamber pressure. If the load is reproducible for you, go forth and slay your game. That load will hunt.
 

flyingagg

Beginner
Dec 16, 2019
245
178
I cant argue with results, but Safety first. It is funny DrMike. I just did the same thing, run the calculations in both QL and GRT and at 70 Degrees F. If I load to mag length (3.4") it is a little better, but anyone seeing this, please, start low and work up.
 

OleBud

Beginner
Jul 29, 2022
17
15
Absolutely! I watched for case expansion after every round. I hope I didn’t violate any rules posting that load since it’s over Max
 

DrMike

Ballistician
Nov 8, 2006
35,482
2,275
It is max given the parameters. As I said, it is not a particularly hot load since it projects at only slightly more than 61K psi. Just be aware that in your system it may give some trouble. It is good that you are checking for case head expansion, which will keep you from a lot of trouble. If you see signs of excessive pressure you will want to adjust your charge. Otherwise, enjoy the accuracy and post some pictures of the animals you take.
 

TackDriver284

Handloader
Feb 13, 2016
1,864
594
Absolutely! I watched for case expansion after every round. I hope I didn’t violate any rules posting that load since it’s over Max
Good shooting, checking the case heads for any sign of extractor marks is another way to check for pressure.
 

OleBud

Beginner
Jul 29, 2022
17
15
Good shooting, checking the case heads for any sign of extractor marks is another way to check for pressure.
I have also been closely checking primers for doming etc. Bolt opens super easy after the shot too, crossing my fingers this is a good stable load I can reproduce!
 

frankm

Handloader
May 10, 2009
420
25
In my 26” barrel 66 grs of R22 tan 2975 fps with 162 AMax. 1/2-3/4” 100 yd groups. Any more powder and groups opened and velocity increase wasn’t that great.

Retumbo would run 3075 fps ish but either of those loads performed great.
 
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