It did not work so well in my revolvers, accuracy-wise, so I gave up on it there. 300-MP is currently my (unavailable) favorite.
In my 77/44, It has better accuracy than 296. I haven't tried 300-MP or N110 in the rifle.
During sighting-in sessions, I haven't noticed the temperature of the barrel getting any hotter than with 296, but then again I haven't read it with a digital thermometer, nor have I tended to fire rapid strings.
Though not a conclusive determination, in my experience Lil'gun, in a .44 Mag, and with SAAMI compliant loads does not have the negative effects seen with the bigger capacity and higher pressure loads. I am aware of it's reputation, though, and have kept an eye out for any signs of damage, but so far it's been good.
