Thread: Roll crimping 308 subs

Originally Posted by Bobba

Hey guys,

I finally got all my parts to try out some subs in the 308. Done all my research and pretty sure I have it sorted except the roll crimping bit so am I on the right track here?

I have a RCBS seating die that by all research and looking down the hole is capable of roll crimping. If I load and seat my projectiles as per normal then remove the seating stem I can then run it back through the seating die to achieve a roll crimp?

Projectiles are the 151gr casts and will seat down to the groove.

Understand I will need to have a play first to determine the correct height and there for amount of crimp and all brass will need to trimmed to correct length.

Any guidance or input much appreciated.

You just need to use a light crimp slightly more than taking the flare out a roll crimp is not nessecary it will damage the projectiles internal structure if not done correctly
there is no way they can be loose in the neck they sized sized to .310" the .308 expander button is .304" to .305" depending on brand of Dies if you are serious about shooting cast bullets
order a Lyman Short .30 cal M die best tool for expanding the case neck and flaring the cast mouth.