Thak you...so what load are you shooting?? I too have been using the 240xtp.
I have been trying lots of different powders but have not gotten one to work well. 4227 looked promising, but it is way to heat sensitive ..the 1st round down the cold barrel goes over the chronograph 200fps slower than the warm barrel. Once I got shooting the barrel warmed and the velocity climbed from 2000 to 2200fps and stayed within 24fps for the duration of my shoot..
296 acctually droped velocity by over 140fps when I went from 47gr to 48gr of powder behind the 240 xtp...I was using a Federal LR Match primer.
I am scared of LilGun, because of the damage it did in Bob Bakers testing with the Freedom Arms guns.
I too added an UltraDot to my 460 and have really enjoyed it...if I could just remember to turn it off..lol