At this point and time I own 3 Ultra Mag's, 2 in 7mm RUM LSS, Sendero SF and 1 in 300 RUM LSS. They are all sub 1/2" groups @ 100 yds. I also reload my own ammo for these guns and wouldn't swap, sell or trade for a 7mm RM or 300 WM because they in no way compare to the RUM's. Your best bet would be to start reloading to get the max performance out of your rifle and load with the type bullet you want. If you want to rebarrel to the 300 RUM you can get a new take off barrel from ebay at around $50.00.