Re: just picked up a 300 ultra
I have had great luck with the above mentioned load of Retumbo and 208 Amax's in a BDL. I have a Sendero that likes the 215 Bergers much better than the Amax's. RL 25 is a good powder. My 2 guns loved Retumbo, so I never felt the need to use up barrel life chasing after a load using RL 25, but what few loads I tried, all showed promise. Good luck.