I did my Winchester in with a 6 mm creedmoor McGowan barrel 28-in 5r rifling number 8 Palma and I made a bullets from David tubbs 115s using a vetiver 568 man oh man that that got shot out of the box better than anything I've ever had I'm talking bullet and bullet and bullet the heavier bullet...
Depending on the round more case fill my be advantageous,I use a 28" heavy barrel with 5 r and a 200 or 220 gr 30 06 rd and 600 yd shots shoots like a engine block through a pre 64 Harry Pope barrel !
Believe it or not I used it in my 6mm cm with 28" McGowan heavy barrel 115 David Tubbs 2.800 col and laddered from 37.5 to 41.0 located two nodes one at 38.8 and the other at 40.7 grs will show 2 ladder tests
Ì myself bore reamed my ruger my col immediately increased, I would first decide where the cutter is making contact ! I would put layout die on the throat in question and take a cut and see contact marks