Quote History Quoted:
That rib raises the front of the cartridge. I don't think you want your (250) behind this point. It needs to be on it or beyond it.
This is why it's only a problem with bullets under 180grs. They are shorter. Bullets heavier than 180grs have no trouble being larger than .250" at that point because of their length.
Motor
View Quote
With lighter bullets, you need to ignore "magazine length" and set bullet seating depth to feed properly. With the heavier bullets, profile plays a big part. Heavy, round nose bullets, with wide ogives, will give you different problems, but you still need to pay attention to the .250 circle for proper feeding.
I'm not advocating seating that .250 circle much behind the rib, but I'm saying that if your bullets' .250 circle is "a little" behind it, they should feed fine. On the other hand, having the .250 circle in front of the rib can cause rounds to point too far up too early.
As I said earlier, it doesn't have to be precise to 0.0001", but you should have that .250 circle pretty close to the rib, and
I think having it slightly behind the rib isn't a problem, since it hasn't been a problem for me and in my guns.