I have a marlin 336 sn indicates 2002 manufacture. The measurements of slug are shown in pictures attached.
Lands 0.3025
Attachment 145198
grooves 0.307
Attachment 145199
Bullets cast from rd 311-165 drop at 0.3125
when chambered it takes a fair amount of force to close lever, but bullets are not pulled from case on extracting dummy rounds.
last pictures show rounds as extracted.
Attachment 145200
Attachment 145201
In the general opinion should I size back to .310? Or will I be fine to run these as cast?
I have thought about shortening Cartridge length by trimming cases, what length have any of you that have shortened cases trimmed to? what overall length have you decided to use?
I guess my general impression is that the marlin bbls are oversized all the way around (land and groove), possibly just a brand new tool when rifling this one?