Micro-groove

[holsterguy]

Older Marlin 30-30 with micro-groove barrel.
Bore slugs at .3085-.3089.
Lee 309-150 F. Drops at .3095-.3105 with 2-1 lead-ww.
If I go 50/50 plus a little tin you think it will drop any larger?
Tried to beagle it so it could be sized .311, but wouldn't chamber because the nose portion was too big.
Ideas??

[Larry Gibson]

Add 2% tin to your COWW alloy. Try that. If it works add lead in 10% increments until the mix no longer works. That will be the quickest, easiest method to see if that mould will work with your rifle.

[holsterguy]

Thanks, Larry!