Thread: powder and accuraccy

It will be the burn rate as well.
Anything that can affect the initial impluse of the powder going off in the chamber and how it burns going down the barrel in conjunction with each rifles inherent harmonics when using a particular projectile.
Back when I was a fitter/turner and machined things you might encounter a piece of steel that just machined horribly.
For whatever reason it turned like shit.
Slowed down, sped up, different tips, angles, cutting fluids, cut depth ( that could be a pain I it did it on a light finishing cut), bits of wood leveled against it from the lathe bed.
If you got the barrel equivalent of that it might only group with one out of a thousand loads and just be an arse with powders having very little change