02-14-2014, 04:03 PM
JASmith Wrote:Are you deliberately misrepresenting my comments?
This guy should be worried given that the operation was described as a "scraping" rather than retouching with a finishing reamer.
Add to that his observation of an unexpected feature that cannot be be explained by the SAAMI drawings, and he should be worried.
Yes, someone who looks down 70+ barrels a day and has developed a reputation for excellent workmanship should understand this.
Fortunately for me I understand reamer design very well.
OK, everyone that owns a AA Grendel barrel pull your barrel out and look down the chamber.
You should see, A big long ring(chamber), A tapered ring (shoulder), a shorter smaller diameter ring(neck), a short steep tapered ring that looks more like a step(cone), a short slightly smaller rig (typical freebore but in the Grendel this is the start of the compound throat that is larger than .264 dia.). Then the lands start sloping up a .5 degree.
If your lands start at the end of the 45 degree cone then the throat part of your chamber is small in diameter and short throated. No part of a .264 diameter bullet can protrude outside the case mouth without slamming into the lands.
What do you see?
I don't care what Satern calls it, anything put in there to correct a small diameter throat will be done with a rotary reamer of some sort. A throater, A reamer, whatever.