Neck Dimension Tolerance

C

costnsg

Guest
This question relates to a 6.5/284 I'm having built that is specified to have a 0.294 neck for the chamber.
My builder tells me the reamer he received measures 0.2944 and that is within tolerance for a new reamer. He made a test cut in a scrap barrel and measured the as cut dimention at 0.2946-0.2947. He's just looking for a green light from me to move forward with the chambering of a new barrell.
Does this all sound right to you guys?
I had specified the 0.294 to allow for a good fit after I trim enough to clean up the brass, so I'm sure the dimension will do for me. I'm just mostly interested in whether this sort of tolerance and result is to be expected.
 
I have seen +.001/-.001 as the tolerance on chamber reamer tolerances. You will be using bushings that also have a tolerance and the internal hole may not be round and size may be off by .0005 or more, either way.
Don't let little things like this hang you up.
 
.2947 is plenty small enough- you will have to turn your necks and that's really all you need. Apparently, this is a pretty common neck size for 6.5mm necks. This is what my .260 Rem has. My next rifle is a 6.5x284 and it will have a .298 0r .299 neck.
 
costnsg said:
This question relates to a 6.5/284 I'm having built that is specified to have a 0.294 neck for the chamber.
My builder tells me the reamer he received measures 0.2944 and that is within tolerance for a new reamer. He made a test cut in a scrap barrel and measured the as cut dimention at 0.2946-0.2947. He's just looking for a green light from me to move forward with the chambering of a new barrell.
Does this all sound right to you guys?
I had specified the 0.294 to allow for a good fit after I trim enough to clean up the brass, so I'm sure the dimension will do for me. I'm just mostly interested in whether this sort of tolerance and result is to be expected.
Click to expand...

Call Dave Kiff at http://www.pacifictoolandgauge.com/ to put your mind at ease. ;)
 
Thanks, guys, for the responses. I've already give the green light to proceed. I mostly just wanted to continue my never ending learning process. I'm sure it will be fine and at this point I'm just looking forward to seeing how it will shoot.
 
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