Gunsmithing 6XC reamer

I would guess you could get away with around 0.105-0.120", but it does vary with bullet (VLD, Hybrid, etc). Best thing is to call Dave Kiff (if you want a PTG reamer) and ask, he is usually very helpful and knowledgeable. I went with a 0.112" for my Dasher, which has a tad shorter neck. I am planning on using the 105 Hybrid.
 
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I called Dave about two months back with the same questions and he said the one Grizzly has is a different leed angle for the 115 DTACS. He ground me a .275 neck 098 freebore 1-30 degree leed angle and it has worked great. With Norma brass and 105 Berger Hybrids the neck measured .271-.272.