I also like 4895. I consider it my general purpose powder. I only recently started using RL15 and am close to calling it my new general purpose powder. I shoot too much to weigh my charges. I used to use ball powders because they measure so well. But I dont like the heat they produce. The RL series looks like a good compromise.
I havent seen a source that give temperature effects, although I think it is generally accepted that ball powders heat fastest, followed by double base powders (such as RL15), and single base powders (IMR series) are the coolest. I cant tell the difference between RL15 and the IMR series, but the ball powders heat up fast.
I just finished reading an article by an engineer that explains a lot of things I have wondered about. I am going to have to change some of my thinking. If you are technically oriented, you may enjoy it also. If not, it will probably make your head hurt. If his theories are right, and they seem to be, it will make picking a good load a lot easier and faster. It may explain why tbury has been having good luck with 3031. Processing...
http://www.the-long-family.com/shock...xplanation.pdf