MK10 Mauser and ZKK BRNOs. Must be controlled round feed, altered to allow single feed without running through the magazine. Been doing this for 35 years and will not alter. I've owned the slam-feeds like Reminton and Winchester and always go back to a Mauser.
: I like the Ruger #1 for open country, but this question was about bolts. 26" of barrel is a good length for them. I got over the carbine-length barrel 'fad' in the early 70's, although my .458 'plinker' has a 21" bl.