This brought a chuckle to me as I bought a pound of it about 20 years ago because practically no-one was using it outside of for shotgun shells. "They" all said that there are no rifle loads because it's not safe for use in rifles - that was enough for me to try it. I played a very little with it and still have at least 90% of it.
I tried it in the 351 WSL and a couple of other cartridges, all with cast bullets. In the 303 Brit (and 308 Win), 15.0 grs under a 200 gr bullet averaged about 1400 fps.
See now that might be useful to me as I have a 303 and about a hundred 200gr cast lead bullets w gas checks.