Following the 'stuffing' discusuion I have my own questions. I am loading three cartridges; 303-25, 303 Brit and another 303 Brit with cast bullets.

quote:

Way too many excellent Powders are available today that negate the Filler concept to risk damaging a firearm.

Ummmm..... My loads leave enough room to add an extra 25% or so.... not looking for a filler, just a fuller powder! I am using what seems to be the ideal powder for caliber bar the volume, that being Varget/AR2208. I use the same powder in the two 303 Brits and the 303-25 and the same powder charge in one 303 Brit and the 303-25. Any recommendations? H4350/AR2209 perhaps? My requirements are max velocity for the 25 and medium velocity for the 303 Brit and max 'cast velocity' for the 'other' 303 Brit. By the way, I use starting loads for the cast bullets and cast them heavy to keep pressure up and velocity down (the 'heavy' also compensates for the lower velocity of cast).

h335, but that won't fill the case. 4350 is way too slow

4064 !

I don't have a 303 case to measure but compared to IMR powder the Alliant is a little bulkier. Look for a load with Rl 19 or 17.