I know RL 33 is a very slow burning powder, but 72.5 grains of anything in a 264 is a boatload. And Alliant doesn't even list it in 264 charts, or the ones I have.
Loading a 264 off Hodgdon charts with their powder plus IMR & Winchester shows a max charge of 67 or 8 grains. with the slowest they offer.
Now this doesn't answer which powder is hotter, but 72.5 grains in a 264 might be a whole different source of heat.
Am I way off base here? Missing something?
I've loaded 77.0 gr of US 869 in my .264 Win Mag. Goes about 3,100 fps with a 140-143 gr bullet.
On a side note, I know W-748 was developed with a "low flame temperature" - whatever that means. Burns cooler than comparable speed powders?
