A 300gr bullet is very light for this cartridge and has a poor ballistic. The lightest bullet I used was the 450gr TSX bullet from Barnes. The ballistic was very good. I shot a buffalo with it, but then stayed true again to the 500gr bullets.

The 500gr SP Interbond bullet from Hornady was perfect for hunting Wisent, as well as for some buffalos that I have shot with it in Africa.