MemphisMechanic Posted October 14, 2016 Share Posted October 14, 2016 (edited) 1 hour ago, ElMateo487 said: I am worried about someone opening it up too much, and losing accuracy. Is this something I shouldn't be worried about? I don't know about Grams procedure, but the two (non-Tanfo) barrels I've reamed myself? I made a few dummy rounds at various lengths (1.120" ... 1.130... on up to the 1.155 I desired) with the bullet I intended to use, and went slowly. Use the dummies to keep track of how much you've cut, and you can precisely throat a barrel. I wanted the aftermarket barrel in my M&P to eat 135gr BBI bullets at 1.150" so I reamed the barrel until a 1.155" just barely touched the rifling. It shoots lights out, and has not had a feeding malfunction in 5,000 rounds with case-gauged ammo. I'm a firm believer in only shooting ammo that passing the plunk/spin/flip/fall test in that gun. You'd be amazed how often people feed ammo to guns that don't quite have the chamber depth to accommodate it. Edited October 14, 2016 by MemphisMechanic Link to comment Share on other sites More sharing options...
IronArcher Posted October 15, 2016 Share Posted October 15, 2016 So this is more a depth thing than an I.D. Thing?Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
johnbu Posted October 16, 2016 Share Posted October 16, 2016 Yes. start of the rifing too soon, too narrow. Link to comment Share on other sites More sharing options...
rootacres Posted October 17, 2016 Share Posted October 17, 2016 Has there been any information out there on how to track if your barrel is out of spec based on the serial number? Link to comment Share on other sites More sharing options...
MemphisMechanic Posted October 17, 2016 Share Posted October 17, 2016 Well, what bullet are you loading and how long are you able to load them? That's probably going to be helpful information to help the others determine. Or, when was your gun built? Link to comment Share on other sites More sharing options...
emjei Posted November 17, 2016 Share Posted November 17, 2016 Spoke to Grams today.....he seems very knowledgeable and knows about Tanfo issues..... my barrel will be on his way tomorrow Sent from my SAMSUNG-SM-G900A using Tapatalk Link to comment Share on other sites More sharing options...
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