I had a ZKK602 in .358 Norma and it as a very smooth feeder - slow, fast or whatever - then re-barreled it with a ZKK 602 .375 take-off barrel ( a guy bought the .375 just to build a .505 Barnes Supreme) and the .375 fed very nicely as well - fast, slow or whatever.

Same with the .375 Weather Warrior Savage in .375. Funny, my only .375 now is a .375/06IMP on a Mark 10 Mauser - it feeds beautifully and now I prefer it to all my previous .375's.

I had a .264 Win Mag. on a Post 64 M70 - fed well, then rebarreled it to .458 Alaskan (.450 Alaskan rebated rim to .532") and had it feeding very well - slicker than the Mausers. I had a J.P.? Sauer '06 once that fed very smoothly - slick would be the proper word.

I guess it's all about what you get hung up about or demand from the gun - if they feed perfectly, creepingly slow, medium or fast, that's good enough for me.

It's a tool, make it work.