Guys, I have a custom 12" Encore barrel with hanger bar in 357 Max. Shooting the 150 gr R-P bullet with H110. The first several shots are about 2" low, by the sixth I am about 4-6" high. I cleaned the barrel and let it cool, same thing. I have shot Xtp's out of it with fair groups (2"). But nothing like this. How about a little help?
THanks.