I was making a 300wm load with accurate 31-220LG which is a modified 311284, i got them wrapped with tracing paper, LLA and sized .3095 bore riding nose is .3055 as patched. I chambered one to see what the rifling marks are like on it but when i unchambered it i got a casing, im using polyfill so no mess thankfully and i could seat another, if this load turns out accurate im okay with having to fire every chambered round. But does this cause any problems? I was worried that it might be pushing the bullet into the case and into the rifling different amounts each time, but i am sizing cases so neck tension should be decent. i pencilled in the rifling for contrast but ignore the sharpie mark around it. by the looks of it im guessing it can push into the rifling without changing seating depth but once its in it stays there. If i did get more exposed inside the case the polyfill could probably protect the base for a few miliseconds untill its on its way out. So is this normal? Anything i should be concerned over or do differently? Shouldnt be a problem as a bore obstruction because chambering another bullet would be very obvious somethings in the way.