I finally got around to working up some loads with these two powders and wanted to hear what the general consensus is regarding which determinant to use in selecting a load. Plus, some of the folks here wanted me to post my results for AA2230. I understand that IMR or H4895 are probably the optimum powders for this cartridge but I have a large quantity of 2230 on hand and plan on exhausting that before switching to something else.
I was disappointed with the IMR3031 results because the lowest SD I could obtain was 17.9 with a variation of .65%. With AA2230 I was able to get the SD down to 8.1 with a variation of .30%. The bottom row of numbers is the group size for the ten shots - and they seemed kind of big but I understand that there are many variables beyond my control when using iron sights at 100 yards.
39.5 grains appears to be the most consistent and I think just under 2700 fps should produce acceptable performance out to 600 yards.
Anyone else out here have similar results with AA2230 or do you have some data for other powders that would convince me to use another?
I couldn't seem to paste my spreadsheet data as an object - sorry about that. The last rows in the columns are average velocity, extreme spread, SD, variation and group size.
1/31/11
38.5 39.0 39.5 40.0 40.5
2594 2654 2678 2728 2759
2619 2651 2687 2765 2746
2564 2654 2688 2724 2742
2571 2675 2698 2715 2761
2581 2654 2697 2748 2747
2561 2656 2695 2728 2764
2564 2682 2690 2722 2743
2604 2658 2694 2723 2756
2659 2651 2679 2746 2779
2600 2678 2703 2748 2747
2592 2661 2691 2735 2754
97.91 31.73 25.12 50.25 37.15
30.77 12.05 8.12 15.95 11.68
1.19% 0.45% 0.30% 0.58% 0.42%
3.50 2.75 2.63 3.50 2.25
I was disappointed with the IMR3031 results because the lowest SD I could obtain was 17.9 with a variation of .65%. With AA2230 I was able to get the SD down to 8.1 with a variation of .30%. The bottom row of numbers is the group size for the ten shots - and they seemed kind of big but I understand that there are many variables beyond my control when using iron sights at 100 yards.
39.5 grains appears to be the most consistent and I think just under 2700 fps should produce acceptable performance out to 600 yards.
Anyone else out here have similar results with AA2230 or do you have some data for other powders that would convince me to use another?
I couldn't seem to paste my spreadsheet data as an object - sorry about that. The last rows in the columns are average velocity, extreme spread, SD, variation and group size.
1/31/11
38.5 39.0 39.5 40.0 40.5
2594 2654 2678 2728 2759
2619 2651 2687 2765 2746
2564 2654 2688 2724 2742
2571 2675 2698 2715 2761
2581 2654 2697 2748 2747
2561 2656 2695 2728 2764
2564 2682 2690 2722 2743
2604 2658 2694 2723 2756
2659 2651 2679 2746 2779
2600 2678 2703 2748 2747
2592 2661 2691 2735 2754
97.91 31.73 25.12 50.25 37.15
30.77 12.05 8.12 15.95 11.68
1.19% 0.45% 0.30% 0.58% 0.42%
3.50 2.75 2.63 3.50 2.25