57gr is starting load 63.5gr is max load listed for AR2209 275gr projectiles 300gr are not listed in ADI manual. I would say you be safe to use 57gr of AR2209 but that does not really answer your question:rolleyes: does it.
you could email the woodleigh dude who makes the projectiles in Australia,same place the powder is made.
If I find out anymore I will let you know
cheers JL
