I have a Swift as one of my primary varmint rifles. My barrel is an orginal 26" Winchester SS tube twisted 1-14".
It shoots the 50 gr Blitz King quite well at 4000 fps and is a 400 yd rifle for sure, maybe more.
If you want a sure thing death ray for those ranges the Swift is the orginal and still not beat. For a new barrel and the usual bullets I would go 1-12".
If you want to shoot further then consider a 6mm of some capacity or a fast twist .224" if you want to try something different then look at a 1-9" and the 75 gr Hornady AMax. That bullet has a Ci of .435 which is better than what most varmint bullets can boast.
For me the path of least resistance is the 243 shooting 55's thru 100's twisted 1-10"
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