Could be worse as I saw a military remington action rifle in 300 win mag once too. It was a US 50-70 that had been converted. The main issue you will have is the feed lips and the folower. Make a dud up and stick that in the action and try to feed it and work on where it binds up. Personly I consider going from 5 30-06 rounds in the mag to 3 .300s a step back though.