Re: Newbie (Crimp or Not?)
1st: Welcome, hope your stay is long and enjoyable.
2nd: No. Hows that fore brief.
Have never found the need to crimp on the 270 in 35 years of reloading for it. Also load for 338 and 355 along with 222 and 223. I don't crimp anything.
I'd try seating that 270 bullet so that the bottom of the canelure is exactly at mouth of the case. That's been the sweet spot for several rifles that I know of, included one I load for.
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!