Same seating die, different projectiles, off by .050

[Rh0dz]

I'm running a 6.5cm bolt and have been running Berger long range target 140s exclusively for this rifle. I don't have a hunting round and found some 140 Berger elite hunters and figured I'd throw up 5 with my LR target load and see how it grouped considering they are the same weight. When I seated the bullet, the CBTO was .050 longer than the LR targets. I'm jumping my LR targets .055 so this would put the elite hunters at 5 thou off. Am I missing something? I thought the seating die works by seating with the Ogive which should match with my comparator to the base of the brass, correct? I'm using a Redding seating die w/ vld stem.

I'm sure I'm overlooking a simple variable but my brain is starting to hurt.

 

[Alabusa]

Totally different profile on the bullet

 

[mtang45]

Your seating die is not seating at the ogive. Also the ogive is likely going to be in a different place on those two bullets. Yes they are both 140gr Bergers but they are different. Use your comparator to measure from the bullet base to the ogive on both of those bullets. I'm betting there is about .050 difference.

 

[Rio Precision Gunworks]

Measure BTO with just the bullet in the comparator/caliper. What's the difference between the two bullets?

 

[Marine52]

Totally different profile on the bullet

This. Remember, the ogive is the entire curved part of the bullet between the point where bore diameter ends and the bullet tip. Your seating stem will contact the ogive at a point on the bullet equal to the inside diameter of the tip of the seating stem. The point on the bullet ogive that equals that specific diameter will be different for different bullet profiles.

 

[Rh0dz]

Thanks for the responses. My mistake was thinking the seating stem would catch each bullet in the same spot just like the ogive. Thanks again.