Could someone please QL my Cartridge Load?

taylorce1 · May 18, 2010

6X47 (222 Rem Mag) 28 gr H322, CCI 450 Primer, COAL 2.40" 70 gr Nosler BT & 27.1 gr H322, CCI 450 Primer, COAL 2.40", 70 gr Sierra BK

Just want to know how high I might be pusing my pressures? The Sierra load is on the cusp but the Nosler seems fine

I've been getting most of my data from either Hodgdon's web page or from my Sierra Manual. Hodgdon list max charge for this cartridge at 28 grains of H322 and Sierra has it at 28.1 grains. Both have this listed as 3100+ fps load with Sierra and Hornady bullets. Even though it isn't listed in the load data I've been using CCI 450 primers in both loads. 26.5 grains of H332 gave me the best accuracy for the Noslers and 27.1 grains gave me the best accuracy with the Sierras.

I stoped all my loads 1 grain below max because of the hotter primer. The Noslers haven't showed any pressure signs yet and I've actually ran them all the way up to 28 grains with no extraction problems or primer issues. I only went up that high after the 27 grain load didn't show any signs of pressure working up in small amounts shooting 3 shot groups using fire formed brass.

The Sierra bullets on the other hand with the 26 grains of H322 gave me some flattening of the primer, 26.5 grains looked normal, and 27.1 grains had me flattened again with some cratering. Again using the FF brass, I just can't figure out why the Noslers aren't showing any pressure signs like the Sierra's

FOTIS · May 19, 2010

taylorce1":36gtnbu7 said:
6X47 (222 Rem Mag) 28 gr H322, CCI 450 Primer, COAL 2.40" 70 gr Nosler BT & 27.1 gr H322, CCI 450 Primer, COAL 2.40", 70 gr Sierra BK

Cartridge : 6 x 47 (6-222RemMag)
Bullet : .243, 70, Nosler BalTip 39532
Cartridge O.A.L. L6: 2.400 inch or 60.96 mm
Barrel Length : 20.0 inch or 508.0 mm
Powder : Hodgdon H322

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.754% 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

-17.5 89 23.09 2671 1109 35917 7567 93.0 1.079
-15.8 91 23.58 2727 1156 38109 7748 93.9 1.052
-14.0 93 24.07 2783 1204 40441 7921 94.8 1.023
-12.3 95 24.56 2839 1253 42921 8086 95.6 0.996
-10.5 97 25.05 2895 1303 45562 8242 96.4 0.969
-08.8 99 25.54 2951 1353 48377 8389 97.1 0.944
-07.0 101 26.04 3006 1405 51377 8526 97.7 0.919 ! Near Maximum !
-05.3 103 26.53 3062 1457 54581 8652 98.3 0.895 ! Near Maximum !
-03.5 105 27.02 3117 1510 58003 8767 98.7 0.872 ! Near Maximum !
-01.8 106 27.51 3172 1564 61661 8870 99.1 0.849 !DANGEROUS LOAD-DO NOT USE!
+00.0 108 28.00 3227 1619 65576 8961 99.5 0.827 !DANGEROUS LOAD-DO NOT USE!
+01.8 110 28.49 3282 1674 69772 9040 99.7 0.806 !DANGEROUS LOAD-DO NOT USE!
+03.5 112 28.98 3337 1730 74252 9105 99.9 0.785 !DANGEROUS LOAD-DO NOT USE!
+05.3 114 29.47 3391 1787 79042 9156 100.0 0.765 !DANGEROUS LOAD-DO NOT USE!
+07.0 116 29.96 3445 1844 84183 9194 100.0 0.746 !DANGEROUS LOAD-DO NOT USE!
+08.8 118 30.46 3498 1902 89710 9225 100.0 0.727 !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 108 28.00 3355 1750 78582 8622 100.0 0.771 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 108 28.00 3045 1441 53417 8890 95.0 0.901 ! Near Maximum !

Cartridge : 6 x 47 (6-222RemMag)
Bullet : .243, 70, Sierra HPBT MatchK 1505
Cartridge O.A.L. L6: 2.400 inch or 60.96 mm
Barrel Length : 20.0 inch or 508.0 mm
Powder : Hodgdon H322

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.754% 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

-17.5 86 23.09 2632 1077 33927 7596 92.4 1.103
-15.8 88 23.58 2686 1122 35936 7783 93.3 1.078
-14.0 90 24.07 2741 1168 38067 7963 94.3 1.052
-12.3 92 24.56 2796 1215 40329 8136 95.1 1.024
-10.5 94 25.05 2850 1263 42732 8301 95.9 0.997
-08.8 96 25.54 2905 1311 45281 8457 96.6 0.971
-07.0 97 26.04 2959 1361 47994 8603 97.3 0.946
-05.3 99 26.53 3013 1411 50877 8740 97.9 0.922 ! Near Maximum !
-03.5 101 27.02 3068 1463 53948 8867 98.4 0.899 ! Near Maximum !
-01.8 103 27.51 3122 1515 57219 8983 98.8 0.876 ! Near Maximum !
+00.0 105 28.00 3175 1567 60705 9087 99.2 0.854 !DANGEROUS LOAD-DO NOT USE!
+01.8 107 28.49 3229 1620 64426 9179 99.5 0.832 !DANGEROUS LOAD-DO NOT USE!
+03.5 108 28.98 3282 1674 68377 9260 99.7 0.812 !DANGEROUS LOAD-DO NOT USE!
+05.3 110 29.47 3335 1729 72581 9327 99.9 0.792 !DANGEROUS LOAD-DO NOT USE!
+07.0 112 29.96 3388 1784 77071 9381 100.0 0.772 !DANGEROUS LOAD-DO NOT USE!
+08.8 114 30.46 3440 1840 81872 9422 100.0 0.753 !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 105 28.00 3306 1699 72639 8780 100.0 0.795 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 105 28.00 2991 1391 49515 8953 94.3 0.931

taylorce1 · May 19, 2010

Thanks POP! My pressures aren't as high as I feared with the Sierras, I'll not hotrod the Noslers anymore! I figure the action should be able to handle the pressure of 60K psi ok, it doesn't group as well with the Noslers at that charge so my 26.5 grain load should be fine. I'll back down on the Sierra's a little and hope my groups stay in there.

Here is the Nosler Load that I'm doing my pig hunt with. This was my best group during load development. 26.5gr H322

This was the best 5 shot group on a windy day I could manage across the chrony with the 26.5 H322 load. Fastes was 3079 fps and the slowest was 3051 fps, with the string average being 3066 fps.

Here is the max load I tried 28gr H322, not terrible but the other was better.