I ran some loads over my Crony today using IMR 8208 XBR powder and 123gr.AMAX bullets with Rem 7.5 primers and a COL of 2.270" Temperature -5 C or about 27F
grains velocity fps average ES
27.3 2423,2442,2441 2425 31
27.6 2467,2465,2461 2464 6
27.9 2460,2469,2502 2477 42
28.2 2507,2515,2528 2516 21
28.5 2540,2550,2529 2539 21
28.8 2574,2553,2576,2564 2566 23 4 shot string,everything seemed good to go so I loaded some more
29.1 2595,2603,2595 2597 8
29.4 2629,2628,2624 2627 5
All the above loads were safe in my gun with no problems lifting the bolt or extraction.The primers are good too.I can't tell any difference in just looking at the brass.
I don't see a maximum of 29.5 grs. a problem.A gain of 200 fps is plenty.Accuracy was very good at 27.6 grs. then mediocre and then started to tighten up near maximum with the last load 2 bullets touching then one aside a bit.All my shots at 200 yds.
I really like this powder,to me I don't see much difference in the way it builds pressure compared to CFE 223. In my bolt action and accuracy is better.
grains velocity fps average ES
27.3 2423,2442,2441 2425 31
27.6 2467,2465,2461 2464 6
27.9 2460,2469,2502 2477 42
28.2 2507,2515,2528 2516 21
28.5 2540,2550,2529 2539 21
28.8 2574,2553,2576,2564 2566 23 4 shot string,everything seemed good to go so I loaded some more
29.1 2595,2603,2595 2597 8
29.4 2629,2628,2624 2627 5
All the above loads were safe in my gun with no problems lifting the bolt or extraction.The primers are good too.I can't tell any difference in just looking at the brass.
I don't see a maximum of 29.5 grs. a problem.A gain of 200 fps is plenty.Accuracy was very good at 27.6 grs. then mediocre and then started to tighten up near maximum with the last load 2 bullets touching then one aside a bit.All my shots at 200 yds.
I really like this powder,to me I don't see much difference in the way it builds pressure compared to CFE 223. In my bolt action and accuracy is better.
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