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??