cordercorral
Member
9mm cast 147gr...tightgroup 3.4gr COLA 1.134, Tarus 1911 9mm.
I get 4 out of 10 that are keyholed...what am I doing wrong?
I get 4 out of 10 that are keyholed...what am I doing wrong?
Is that velocity a guess or did you measure it yourself? I'm looking at the Hodgdon site and they list a 147gr Hornady XTP bullet with a charge range of 3.2gr to 3.6gr Titegroup. Since you're loading a lead bullet you should not be using load data for jacketed bullets. My Lyman Cast Handbook lists a charge weight range with Titegroup and a 147gr Cast bullet as only 2.5gr to 2.8gr. Your charge of 3.4gr is way over according to Lyman. Where did you get that load data? It's possible you are generating too much velocity which is preventing the bullet from stabilizing.Twist ?...Velocity 915
I think bullets keyhole if they were not rotated enough in the barrel to stabilize in flight, due to undersized bullet/oversized barrel or bullet pushed by high pressure gas unequally exiting the muzzle due to uneven crown, etc. For short pistol distance keyholing like 7-15 yards, I think it's lack of bullet rotation caused by several factors.cordercorral said:9mm keyhole
9mm cast 147gr...tightgroup 3.4gr COLA 1.134, Tarus 1911 9mm.
Outstanding, I'm glad everything worked out well for you...WOW! Thanks for the help. You all were correct in suggesting to much powder. I ended up @ 2.4gr tightgroup. Keyholeing stopped. Cycles great. Accuracy as good as 70 year old hand and eyes can shoot. LOL Thanks to all who helped. This is the best board for reloading!