Originally Posted by Whitesheep
By the way, I tried a load right at the lands. The T/C closed with no problem, but I generated over pressure signs with the first shot so I stopped. This is with a load well below the maximum powder charge recommended by Berger. Interesting.
And there you have it...bolt closed OK but over pressure signs in a mid range load.
I've only tried seating to touch the lands a few times and did not have postive experiences. First, if the seating is off by just a thou or 2, closing the bolt is difficult if not impossible; scary and a pain in the a. (I rarely bring my press to the range to correct seating ;-) and won't test cycle all rounds through the gun at home before going out.) Second, the pressure difference between rounds touching the lands, and those that may be .001 off the lands is nonlinear. Variations in pressure between lengths that are not touching the lands are somewhat predictable, but touching vs. not touching seems very touchy!
Good conversation here. My method has been the one where a nominal lenght is chosen, a .4gr increment range of weights loaded (5 or 10 ea. weight), and then shot as groups at 100, 200, and if it is a good load then 300 yards.
My problem is fliers. Sometimes I have them and sometimes I don't, and I can't figure out whether its me or an external factor. I try to keep everything very consistent through reloading all the way to letting the barrel cool between shots of 2. I have loads that I know are capable of landing 3 out of 5 shots overlapping each other but then the other 2 often might be .5 and even .9" away. ES is around 40 and SD is around 20. But at 200 yards it consistenly holds 1" - 1.5" 5 shot groups, and at 300 yards anywhere from .8" - 3" groups. So it makes me want to change some reloading variable, but I don't know which one. Does anyone "true" their brass to make sure it is completely concentric? Its the last reloading variable I can think of.
Other than that, maybe I should let someone else who I know is a good shooter have a crack at some groups with my best loads!