I think what you're doing absolutely makes a difference, once I started paying attention to shoulder bump my groups got better, replaced lee dies with Redding and Forster and groups got better, bought runout gauge and figured out how to make straighter ammo with annealing and groups got better, got mandrels and ammo is even straighter and groups got better, I never use a FL sizing die anymore, my left alone factory savage varminter shot it's first .25 group couple weeks ago, I remember being on cloud nine if I got a .75 group out of it once in a while, I always say everything makes a difference and it adds up, gotta be open to trying things, it always seems like there's some improvement you can make when reloading, lots of things to try and once you find the right round the challenge is to make it the same Everytime, hell I might try annealing last, just kidding but congratulations on your match's, that's awesome.