.260 rem AR barrel

[waternwaves]

here for a start on the 6.5 thread page.

looking for the next build barrel, a  .260 Rem AR-10 Barrel, in 416 stainless   set up for the following bullets  139 to 146 gr.

Lapua 139 Scenar

Lapua 136 Scenar L

Sierra 140 SMK

Sierra 142 SMK 
Berger 140 Hybrids

Berger 140 VLD's

which chamber reamer for a 5R barrel, and yes it has to go through a conventional AR-10 mag.  Previous non 5R barrels seem to work best with less than .1" jump, but with the contact area of the 5R I am thinking .06.  .  Also,  whose Chamber reamer will work best for these average weight bullets.  . I am guessing the standard TO chamber is cut with a PTG?? IS there a choice?

Thanks in advance

[GLSHOOTER]

They use PT&G reamers exclusively.

I have not shot a TO 260 so don't know the jump. Over the last year we have found various 6.5 bores and chamberings have done extremely well with a great deal of jump far in excess to the common wisdom of up close to the lands.

Greg

[waternwaves]

I guess I consider a lot of jump for any barrel at .035 or greater, I dont have a lot of options with a standard length mag, and with the longer bullets I expect less jump. so looking to find either the ability to specify a depth or identify which PTG was in use, before the next bullet order..

Thanks in advance.