Guess I was simply asking if the harcore reloaders have much luck trying to finetune group size by adjusting seating depth. I dont have access to a shooting range near my house so Im reloading and then driving 30 min to the range. Not able to "play" with loads as much as some are so just trying to save myself some steps. Thats all.
In a word, yes.
I tend to start the journey by selecting a powder that gives me the velocity I want at 96-99% fill. I like a full case but I don’t want a compressed load.
Then I use the Berger seating depth test method:
https://bergerbullets.com/getting-the-best-precision-and-accuracy-from-vld-bullets-in-your-rifle/I’ve always found success with this process. I posted an extreme example on this forum a few years ago, .30-06, 185 VLD Hunting, Hunter powder at max recommended charge.
I always start with the shortest loads, since I can shorten long loads if I find precision quickly. My first group looked like a shotgun pattern, maybe 4 1/2” spread. The next group cut the spread in half, and the third group had all the shots touching. The difference between group one and two was 0.038”, and the difference between group two and three was 0.042.” So from 4 1/2” to touching was 0.08.”
Velocity without pressure is first, then precision. Remember to stay safe.
I’m lucky that I can velocity/pressure test off my back deck.
P