Another question: When working up a load, how often do you guys clean the copper out of the bbl? Or do you at all?
sounds like you need to give that thing a serious bath. get the copper out, then clean it some more. some will shoot better dirty. i have a regular production gun that will shoot it's best when it's a little dirty. my guess is the barrel is rough and some copper actually smoothes it out a little. i don't like to shoot any more than 20 rounds before cleaning.
Thanks for all the advice. I did two loadings at different seating depths but the same powder weight. 99gr US 869, right on the lands and 2 hundredths back at just under 3100 fps. I couldn't keep it under 2" at 100 yards at the lands, but move it back 2 hundredths and the groups shrunk to .75". WOW!
I very much agree w/ the statement about shooting it at further distances. The rifle that I am currently working w/ barely shoots 1" @ 100yds, shoots about 1" or so @ 200yrds. I was ok with that, not excited. Then took it out to long range and it shot 1/2 moa or better from 600yrds out to 1000yrds. I left the house for this session wondering if I could even hit the 2' steel @ these ranges.
I have no idea how many good loads I have never shot past 100yrds, or good rifles for that matter.