crazydaysorg
Member
I'm loading 30-30 with 28.5gr IMR-3031 with 150gr RN.
I took a bunch out to shoot and wound up with some wavy blowback lines around the top of the case. They don't go the entire length of the case, just the top half inch or so.
When I've loaded some light recoil rounds I don't recall the wavy lines or using factory rounds.
Is this normal? Indicative of the brass hardening too much? Or the chamber maybe having corrosion and not creating a good seal? Or something else I haven't even considered?
I took a bunch out to shoot and wound up with some wavy blowback lines around the top of the case. They don't go the entire length of the case, just the top half inch or so.
When I've loaded some light recoil rounds I don't recall the wavy lines or using factory rounds.
Is this normal? Indicative of the brass hardening too much? Or the chamber maybe having corrosion and not creating a good seal? Or something else I haven't even considered?