Retumbo is a great powder. So far I used it in my 6.5 WSM and 300RUM. Its every bit as consistent as H1000 (velocity variation). The Hodgdon loading data is right on the money for the 300RUM when corrected for 30" barrel length. I've had good accuracy in both cartridges.
This powder adds new potential for the overbore magnums. In fact, because of this powder, I am going to resurrect my 6.5 STW. I had problems with the slow ball powders(temperature sensitivity and velocity variation). I look forward to trying in my 22-284 with 80gr Starke bullets.
You can get this powder at www.natchezzs.com
1 or 8 lbs. [img]images/icons/wink.gif[/img]