02-03-2014, 03:04 AM
If there is +/- .001" on the reamer, the -.001" will screw it up, and cause the issues we are seeing.
Tedward, the link you posted is not for the SAAMI 6.5 Grendel, it's for a "6 Grendel".
The SAAMI Grendel chamber is very forgiving for ogive shape and seating depth, even to the point of being labeled a sloppy chamber by many critics. If the reamers are cut with an allowable -.001", that will create tight chambers with a pronounced short throat, exactly as some are seeing on their barrels.
Just in the neck alone, there is .010" - .015" room, since the chamber length to the neck mouth is 1.530", while most brass is 1.515"-1.520". Factory ammo should not be jamming into the lands, but if a .001" tighter reamer was used, this is a very real possibility.
Tedward, the link you posted is not for the SAAMI 6.5 Grendel, it's for a "6 Grendel".
The SAAMI Grendel chamber is very forgiving for ogive shape and seating depth, even to the point of being labeled a sloppy chamber by many critics. If the reamers are cut with an allowable -.001", that will create tight chambers with a pronounced short throat, exactly as some are seeing on their barrels.
Just in the neck alone, there is .010" - .015" room, since the chamber length to the neck mouth is 1.530", while most brass is 1.515"-1.520". Factory ammo should not be jamming into the lands, but if a .001" tighter reamer was used, this is a very real possibility.