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Old May 1, 2013, 10:05 AM   #5
Brian Pfleuger
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Join Date: June 25, 2008
Location: Western Colorado, finally.
Posts: 19,118
Bullets seat by process of pushing on the ogive curve on the bullet, we then measure them from the end. The process and the measurment don't match up.

I haven't seen a factory seating plug yet that touches the ogive. They're not usually flat, touching exactly on the tip, but they don't come close to the ogive, that I've seen.

However, the greater point is a good one. You should get a bushing that's as close as possible to 0.355", zero your calipers on it and see how much the bullets vary.

Distance from the rifling and seating depth are what dictate pressure. If the bullets are reasonably consistent on the ogive and not at the tip, the simple solution is to use the closest you can find to a 0.355" (9mm or 11/32) drill bit and drill out the seating plug so it DOES seat from the ogive.
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