Originally Posted by Shootin4fun
I have loaded 100gr Hornady BTSP Interlocks, and my most accurate load with Varget (32gr) is only about 2690 fps. But I have put 3 rounds in the same ragged hole at 200 yards, with the 4th .25" away with that load.
I'm working on a new load with 4831 in an effort to keep this level of accuracy but boost the vel back up to to 2900 for hunting.
Okay so I tested those IMR 4831 loads to see if I could get the speed up and keep accuracy and I was very surprised. I 5 each in .3 increments. It got interesting at the max loads listed in Hogdon's various manuals, 43.0gr, though I have older manuals that go up to 44.0 gr on a 100 gr bullet. Here's the average of each 5 shot string I chronographed with a ProChrono
42.7 gr = 3055 fps
43.0 gr = 3037 ??
43.3 gr = 3079
43.6 = 3139
43.9 = 3142
All except 43.6 turned in pretty good groups- 3 of the 5 touching. But the hottest load going out at 3142 ES 38 SD 14 might have been the tightest
No dramatic pressure signs...the primers are flattened but not cratered or blown. (Heck, my primers are flattened (tho a little less) in this gun with a mild Varget + 85gr HPBT load. ) There are no brass issues that I can detect.
This is out of a 22" barrel. I don't usually see velocities of a 100gr up there in the 3100+ range. Does anyone else see those speeds with their 243 and 95 or 100 gr bullets? Given no stress signs on the case, is this dangerous??