freebore for new 115 DTAC's

[bullfrog]

Will a .103 freebore place the junction of the boattail above the donut? 6xc with the new 115 DTAC's. This is the freebore on my gunsmiths reamer. I don't want to buy a reamer but will if I need to.

 

[zipollini]

This is directly off of David Tubb's Facebook page which he posted Sept. 6th

"115 Rebated Boat Tail reamer dimensions.

Since receiving the new DTAC 115 RBT's I have changed my straight section (freebore) to .140" with a 1 1/2 degree lead.
Neck diameter is still .278

If you stick with a freebore of .160" you just need to make sure you have a 2.850" or greater overall length in your magazine box."

 

[scott_at_vortex]

I just rethroated a couple of my 6mm barrels and had to extend the throat from .100 to .165. They were throated for 105hyb to the bearing surface just above the neck/shoulder junction. I had to extend the throat every bit of .065 to get the new 115 above the neck/shoulder junction.