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you are flaring the necks in order to get the flat based bullets to seat easier.
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Well, yes. And no. The last batch of 50 of the flat-based bullets, I didn't flair, and just struggled with keeping the bullet straight and got 'em seated (no crimp). I dropped about a dozen bullets, as they fell off while trying to move them into the shell holder, and it's a royal PITA, but I did it. And I will struggle with loading the remainder of those bullets (Win 64gn PP; about 160 remaining) without flair/crimp. But I'm not buying any more - just not worth the hassle.
The other bullet is a 65gn Sierra SBT (boat tail); and I've never flaired or crimped those. And it is the sole bullet I will buy moving forward.
But with either bullet, I'm getting the slight shoulder buckle.
At any rate, when I did crimp, I used a Lee FCD and according to my range RSO - who seriously knows his stuff - he states that it is nearly impossible for the Lee FCD to buckle the shoulder. And judging by how I see how it works - given my meager machinist knowledge - such would seem to be the case. The FCD pushes from the sides, not the top. Moot point at any rate. As every round I FCD'd, it chambered before and after crimping just the same. And all that is neither here nor there - it's outside my issue. I'm talking about rounds I'm not crimping.
I will try to back off the die body on my next load session (could be a while). But I don't think that's the issue. When I set the die body, I ran a sized case up to the top; and screwed the die body down until I could just barely feel it touch the case. I don't see how that could possibly buckle the shoulder. I truly believe the shoulder is buckling as the bullet is being seated.
That said, I don't
know. And that's why I'm asking for advice/information.