I read about IMR Trail Boss in Handloader Magazine. This evening I tried it out with a Savage Model 99 in 300 Savage. I could not believe it! I first shot a few factory rounds, then did the recommended formula and shot 5 rounds of 9gr., 10gr. and 11gr. The recoil just like IMR said it would be, about half or just above .223. I know the Cowboy shooters use it all the time, I haven't heard a lot of talk about it on this site. It certainly would seem to have many uses in testing, training and shoulder preservation. Has anybody had any bad experiences with it. Thanks