I guess it depends. Each situation is different. I'm shooting the 139 Scenars in mine, and the 140 Berger VLD'S. I have all my reloading stuff packed now, and about 80 percent of my shop is also packed, so I can't quote exact measurements. It sounds like your throat is longer than mine. I'm shooting mine with the Bergers jammed .010, and I believe the Scenars "on". I may have that backwards though. I had flyers with the SMK's.
Do you have a concentricity gauge? Also, do you know how much neck tension you're running? With groups in the .2's, you must have something right. What's your extreme spread in velocity? What do your groups look like at 600 and 1K yds?
I'm running H4831sc myself, but I can't get near your powder charge! I'm running 50.0 grs with the one bullet, and 50.5 grs with the other. I'm running right at 3000-3050 with both bullets. I'm using Lapua brass and Fed match primers too. I'm wondering about your chronograph. Is there someone else you shoot with that has one to compare against?
Also, food for thought, if you don't want to live with the long throat issue, you can either rebarrel, or have a smith set yours back and rechamber. I ordered my 12F as a stocked action from Northland, and ordered a McGowen bbl with it.
Bookmarks