Originally Posted by cfvickers
I have looked at a few places with user submitted loads and I cannot find where anyone is using it to a great extent. The data in manuals suggests it would be very good, I bought a pound of it to work with but I would like to know, why does it seem so few use this powder. I have not used a lot of IMR powders, is it just new or something? Or is it just inconsistent.
There normally a good lag time from when a powders first introduced and getting into all the reloading manuals. Hornady's new manual #8 has loading data using IMR-4007ssc in the 7-08.
According to IMR, IMR-4007ssc "ideally suited for the varmint cartridges like the 220 Swift,22-250 and 243" and they do mention cases like 30-06,300WSM and 243/25WSSM.
Hard to speculate on powders I have few reason why I don't try new powders and few why I do. I don't mind trying new powders on a new rifle on an existing rifle I'm pretty set on the loads I've worked up.
I've had pretty good luck with IMR-4007ssc in a 243AI and I tried it in a 300WSM,30-06 and 22-250AI and I'm going to do little more with it in the 300WSM.