Hi Naki I sincerely appreciate your concern. I've been handloading rifles (first a .243, then my .270 and now my .375 H&H since the early 1970s). I have given my youngest son my .270 and he shoots only the Remington 150g Swift A-Frame factory loads. My older son has his grandfathers .270 (identical Rem 700 BDL only left handed). My primer pockets were always tight, I measured the web with a digital caliper, no difficult extraction or extractor marks on the cases, no signs of high pressure whatsoever. Trust me, when I first started handloading my .243 I went up by .5 g increments and did hit high pressure signs with some powders and immediately threw the rest of those rounds with that load away and backed off 2 grains! I put several hundred of those 150g 3000 fps rounds through that rifle plus thousands of very light varmint loads (90g Sierra HPBT at 3100 fps). When those 150g Noslers hit elk or bear you'd think they were struck by lightning! Never had one move more than 5 yards after being hit. Remember original factory loads for the .270 were 130g at 3140 fps and 150g at 2900 fps. If you send me a PM I'll respond with the powder (not the amount!) primer and other factors I believe made it possible without unsafe pressures, with a please do not forward caveat. I do believe each rifle is a little different. I never used those handloads in my father in-laws .270 (now my older son's rifle) because I only neck size my cases.

Regards,
Chuck