I have an Ultra-Mag and it loads everything well. My big gun is a 416 Rigby and it resizes it as easily as a 243. The ergonomics are great even when using quite a bit of force on forming wildcat rounds. As an aside when I broke a connecting pin 1 call to Redding and I had a new one in 3 days with no charge. The customer service there is as good as it gets! I use my 30 year old rockchucker only as a universal depriming station. I have been using my Ultra-Mag over 15 years now with only the single problem noted above. The $120 difference over the life of these presses is inconsequential. Sizing true Lapua/Rigby size cases in a RCBS vs. Ultra-Mag is night and day easier with the big boy.