300 blk neck tension and sizing

[jp201827]

So I’m delving into the 300blk world when I complete a aero precision/bcm build I’m working on. I just looked and it looks like Redding doesn’t make a bushing die so that I could vary neck tension like I do with my 6.5 creed and 308 loads. Anyone know of a good sizing die that works like the Redding bushing dies so I could customize my neck tension on the 300blks? Also since this is an ar15 I’m guessing 2thou, which is what I try to achieve with the bolt gun loads, is too little neck tension. What’s the recommended neck tension for ar15 loads? Thanks

 

[jp201827]

Bump

 

[Mike_in_FL]

Most people shoot for .004 neck tension in semis. I know I have some kind of tapered crimp die for .300BO but have yet to use it, all my blackout stuff has been on the back burner for awhile. I was just using a FL die and not worrying about neck tension as it turned out I had another issue with my rifle. If you read this section of the forum a lot you'll see a lot of people like to use Lee collet dies to set neck tension.

The first sub moa group I ever fired with reloads was .308 using LC brass and an RCBS FL die where neck tension just is what it is. I'm not saying there aren't better ways but good rifles will generally shoot in my limited experience.

 

[NighthawkCG]

I currently use a RCBS small base set and finish with Lee FCD. That should work for an auto (works for mine).

I also have a bolt gun I try to eek performance out of with subs and have been looking at bushing dies. L.E. Wilson makes a bushing die set. Haven't upgraded anything yet.

 

[padom]

Forster FL sizing die and Ultra Micrometer seater. Ive been loading 125 TMKs over 18.6gr H110 for my 10.5" Ultramatch 300blk and it's a tack driver.