Here's the data:
http://www.castpics.net/LoadData/Sur...pages/7x57.htm
The day I saw this I quested for an RCBS mould and did not stop until I had it. My MarkX likes 175 grain jacketed and 140 grain barnes (longer than normal lead core) and can even shoot 100 grain varmint bullets decently when shot at warp speed. It's an easy going rifle for jacketed. an inch is not too difficult, on a great day the holes touch, hitting a man sized target at 700 yards is no big deal.
I want a load with 872 and the RCBS that does 2-2.5" at 100 yards with reasonable reliability.
I've tried 54, 53, 52, 51, and 50 grains so far, with the bullet seated right down on the powder for each charge (after settling, the powder likes to settle a lot.). Best I'm getting is 4+ inches at 100 yards, I know this can do better. At the moment I have no accuracy load for this bullet or powder. I've shot the LEE soupcan to 50 yard accuracy (but not 100) with trailboss.
I want to make this combo work. Any advice from the folks who use 872 in particular? Any clues here as to what I could change to eeke a little more accuracy out? Does 872 like to be compressed? likes a little more air in the cartridge? Shoot the bullet a bit slower? Any obvious guidance or tips when using 872 in the 7x57?
Thanks!