I own rifles chambered for both cartridges and in all honesty while the ultra mag offers 50 to 70fps more velocity than the stw ,I prefer the stw.The ultramag case is so large that you must burn a great deal of extra powder for a very small gain in velocity and barrel life is even shorter.I do find that the 300 ultramag is a much better use for the big ultra case.I use a rockchucker to load both rounds.

Edited by - stubblejumper on 12/31/2002 19:18:14