9mm cast bullets tumbleing....

hoytinak

Active Member
Mar 5, 2008
660
36
Texas of course
I ordered some 9mm lead bullets reloaded them and they are keyholeing in every 9mm I own (6 different ones) from all different ranges. I measured some and they are all .353". Shouldn't lead 9mm bullets be .356"? Would this cause the tumbleing? If that's not it anything ideas on what else it might be? Thanks
 

txpete

Member
Mar 17, 2008
136
16
ft hood
oh...yea that sure would cause it and some good leading I am sure.I cast my own and size .356 and no problems with them keyholing.
keyholing is caused by
under sized bullets
out of round bullets
pressure being to high
bullets being to soft

I make my own alloy of wheelweights and linotype. mixed 9 lbs ww to 1 lb of lino.bhn runs 12-14 bhn.
pete
 
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