I have a 15 year old 870 that I bought the mossberg made 18-1/2” cylinder bore replacement barrel for about the same time I bought the gun. Just about every 5th or 6th round, the spent shell jams in the barrel and I have to hit the butt stock on the ground so I can extract the shell.
Question is if it’s a possibility I need to have a smith ream out the barrel where the brass lays. With the barrel removed, a non fired shell easily falls in and out of the barrel but a spent shell is snug, some too snug to remove without prying our with a screwdriver. To a degree I’m sure it’s normal for the brass to stretch, my question is how much. The OD of a new shell at the brass is about .803" and spent shells range from .812” to .815” with a dial caliper. The barrel is about .806". I don’t recall the factory 28” barrel doing this. Shells are Winchester universal 2-3/4” x 1-1/8 oz.
Question is if it’s a possibility I need to have a smith ream out the barrel where the brass lays. With the barrel removed, a non fired shell easily falls in and out of the barrel but a spent shell is snug, some too snug to remove without prying our with a screwdriver. To a degree I’m sure it’s normal for the brass to stretch, my question is how much. The OD of a new shell at the brass is about .803" and spent shells range from .812” to .815” with a dial caliper. The barrel is about .806". I don’t recall the factory 28” barrel doing this. Shells are Winchester universal 2-3/4” x 1-1/8 oz.