@paul73 why is that I am just curious? Still trying to figure out what powders are optimum for certain bullet weights. This one is a 1:9. I have a 1:8 and a 1:7 though as well. My main go to is the 1:9, so that’s why I have been exploring with different 55ish grain projectiles. I loaded up some 60 grain v-max and they performed well. I agree! Wow!! That is a very tight group! What distance was that if you don’t mind me asking?
all the group tests are done at 100yds.
on matches of projectiles weight to a twist:
on powders - it really gets down to what you prefer to stock up and how it works across other calibers you reload.
i stock up varget only as it works very well for my 1:8 twist on .223 - and i also plan on doing 6mm loads that would use same varget.
.308 loads i did with it so far did not produce nothing exceptional, but, it works there OK too.
i went over multiple experiments for my own pleasure to explore other powders and combinations - it is a hobby of its own, really. no wrongs or rights there, as long as it works and you keep it safe.
55gr wants a bit of a faster powder than a heavier 69gr or 77gr bullets - those are good with varget.
you want also as much powder in the shell as possible to minimize the error margin on unequal drops, but there are limits of how much compression you can do there. it is a very exciting hobby to make your own ammo that works for you - it does not mean it will work for anybody else.
of course, you need to test all that with your own rifles as each barrel is individual. and each rifle may end up with its own ideal loads.
if a rifle can provide good accuracy - with some effort you can bake a perfect ammo for it. look up in this forum what other folks do, when you get consistent same rugged hole groups - it is truly something. feels real good.
and a good group - here is a 'good' group - from 6.5CM bergara of mine - it is from 300yds - this takes some effort to get to - 5 shots there. one to the left is my bad trigger work.