No flame intended here either, just wanted to clarify.
Thats one thing I hated about my swift was winchester brass. When I started pushing things, I would sometimes only get 2-3 firings per case before I would have split necks, or have to trim for that matter. When I got the swift, I was looking at pure speed with 40g bullets which will net anywhere from 4300-4500fps. After it was all said and done, I wished I would have gotten a 243 for the reasons you stated above. You can get 4000fps easy out of 55g and the 243. However, you have the ability to shoot 70-80g bullets that will hit harder and buck the wind better for the longer shots that I like to practice and take if the oppurtunity arises. I think for the amount of powder you burn in a swift, its better to get a fast twist barrel and shoot the 75g amax. But thats a whole different story...
BTW- Would you mind sharing your top end loads with your 22-250 and 55g bullets at almost 3800fps?? Reason I ask is because I would like to start working up a good 55g NBT load out of my dads Ruger Target 22-250. At the moment, I"ve only worked with 40g vmax and 52g SMK's. Thought I'd bring the old 250 out of the closet and see how it goes with some 55g NBT's. The rifles got a 26" heavy barrel, so I was thinking maybe 3700fps was around tops with max loads. We'll see. I think I"m gonna start with IMR-4895, its been good to me out of the 250 so far...