I have a .243 that shoots my handloads decent - about 1 MOA. I typically seat bullets for this rifle about 20 thousandths from the lands. However, some factory loads with a similar bullet shot great from the rifle. My measurements show that the bullets were seated about 100 thousandths from the lands. This shows me that a deeper seating depth for my load is definitely worth trying. My question is this - should I just knock the bullets in my loaded rounds back (incrementally, of course), or should I just load new rounds. I have a slight concern that knocking the bullets back on loaded rounds may break the case's neck tension and therefore have different characteristics than rounds with bullets seated initially to that depth, but I have quite a few loaded and this would be a simple way to make test rounds. What do you guys think? Thanks.