Post by Richard on Apr 30, 2020 16:12:30 GMT -5
Some more Satterlee graphs….
200 yards
This week I went with IMR-8208 from 88 grains to 92 in ½ grain increments along with the 350 gr. AeroMax. I do think that when powder weight gets up this high, that one grain increments would be a sufficient change rather than ½ grains……………..unless you really are trying to “nail” it down! I did a dual graph with both velocities and then one with the average velocities. I think the graph and data sheet pretty much describes the test. I will note that at 90.5 gr. the group got really small; at 91 gr. the first shot would have practically gone into that same cluster, and even the second shot would have kept it a fairly small four shot group at 200 yards?
For group #10 I went back to the load that shot well last week in and around 73.5 gr. (4198) with the 300 XTP at 100 yards. The group was somewhat horizontal but still fairly tight. On my sheet I indicated that shot #6 was the far right?....Wrong….. it was actually shot #2, that higher velocity shot! (too lazy to re-do the page!) Curious why Shot #2 jumped in velocity but also went far right. Five of the six shots had an ES of only four.
Pulling some 230 gr. HAP’s (Hornady Action Pistol) out of my box I pushed them to 3250 fps with a 10/65 duplex of 110/4198 and a .730” three shot group.
Lastly, I tried a 250 gr. XPB (no wad) with the same duplex and it rewarded me with a keyhole, 11” high and 5” right. Needless to say I abandoned that threw the remaining five bullets I had, into the trash! They may be OK with a wad but I had no more of these bullets and did not want to waste anymore powder on them. (they had been donated to shoot in the CVA Scout)
200 yards
This week I went with IMR-8208 from 88 grains to 92 in ½ grain increments along with the 350 gr. AeroMax. I do think that when powder weight gets up this high, that one grain increments would be a sufficient change rather than ½ grains……………..unless you really are trying to “nail” it down! I did a dual graph with both velocities and then one with the average velocities. I think the graph and data sheet pretty much describes the test. I will note that at 90.5 gr. the group got really small; at 91 gr. the first shot would have practically gone into that same cluster, and even the second shot would have kept it a fairly small four shot group at 200 yards?
For group #10 I went back to the load that shot well last week in and around 73.5 gr. (4198) with the 300 XTP at 100 yards. The group was somewhat horizontal but still fairly tight. On my sheet I indicated that shot #6 was the far right?....Wrong….. it was actually shot #2, that higher velocity shot! (too lazy to re-do the page!) Curious why Shot #2 jumped in velocity but also went far right. Five of the six shots had an ES of only four.
Pulling some 230 gr. HAP’s (Hornady Action Pistol) out of my box I pushed them to 3250 fps with a 10/65 duplex of 110/4198 and a .730” three shot group.
Lastly, I tried a 250 gr. XPB (no wad) with the same duplex and it rewarded me with a keyhole, 11” high and 5” right. Needless to say I abandoned that threw the remaining five bullets I had, into the trash! They may be OK with a wad but I had no more of these bullets and did not want to waste anymore powder on them. (they had been donated to shoot in the CVA Scout)