Precision Seating Stem for the 215 Hybrid

[SLIVER]

Hello all, I am experiencing some variances while seating the 215 hybrid in my 300WM. I am currently using the Redding competition dies found here (https://www.midwayusa.com/product/887735/redding-master-hunter-2-die-set-300-winchester-magnum). My target COAL is 3.6870, and it is pretty hard to hit that exact number.

I am wondering if you guys are using a special stem for these bullets? I really don't want to have to buy new dies, as these ones weren't cheap, but am hoping for an option that allows for a more precise seat with this die set and the 215.

Thanks a bunch.
))--SLIVER-->

 

[brentc]

Hello all, I am experiencing some variances while seating the 215 hybrid in my 300WM. I am currently using the Redding competition dies found here (https://www.midwayusa.com/product/887735/redding-master-hunter-2-die-set-300-winchester-magnum). My target COAL is 3.6870, and it is pretty hard to hit that exact number.

I am wondering if you guys are using a special stem for these bullets? I really don't want to have to buy new dies, as these ones weren't cheap, but am hoping for an option that allows for a more precise seat with this die set and the 215.

Thanks a bunch.
))--SLIVER-->

Do you measure base to ogive with a comparator? If not, you need to. Measuring base to tip is not a precise method because tip shape varies from bullet to bullet. I'm betting your Redding dies are seating your bullets more precisely than you think.

This is the tool you need to precisely measure your seating depth. https://www.midwayusa.com/product/2...ad-bullet-comparator-basic-set-with-6-inserts

Attach this to your caliper with the appropriate insert for the CBTO (Cartridge Base to Ogive) length.

 

[youngbuck]

Exactly what Brent said. I have the same hornady set as well

 

[SLIVER]

I have not been measuring to the ogive. I will give that set a try and hopefully find the seating more consistent. I assume you use the comparator to find the ogive measurement when finding the lands, and then subtract from there?

Thanks for the info guys.

))--SLIVER-->

 

[brentc]

I assume you use the comparator to find the ogive measurement when finding the lands, and then subtract from there?

Thanks for the info guys.

))--SLIVER-->

Yes. Once you've found the lands, measure the CBTO of your dummy round and subtract from there.

 

[SLIVER]

Sounds good, thank you!

))--SLIVER-->

 

[6point5x284]

The other thing I've seen is primers not perfectly flush. If your primer is sticking out a thousandth or two, you may not even realize it or feel it, but it will show when you go to measure with the comparator.