Back ground =
Bought S&W model 28 barrel that had been bored and rifled to .430
Also found old beater model 28 .
Installed barrel and 44magnum cylinder on model 28.
Had to shorten back of barrel for cylinder gap .
Problem =
Shooting 250grain LSWC bullets over 10 grain of Unique I get about 2-3 perfect key hole and a couple bullets you can see was tilted when they hit the target out of 12 shots.
I shot groups with each cylinder to see if it was any one cylinder.
Same results.
So I switched to 240 grain JHP bullets
No problem
Next I tried 180 grain RNFP cast bullets.
No problems!!!
Why am I getting key holes only with the 250gr. SWC ?
Btw- The 250 swc shoots great in two other S&W revolvers I have.