SWprotected Posted September 1, 2014 Share Posted September 1, 2014 I am interested in having this done in order to make my edge more reliable with coated lead bullets. Who would you recommend? Link to comment Share on other sites More sharing options...
ltdmstr Posted September 1, 2014 Share Posted September 1, 2014 Any competent smith should be able to do it. You can do it yourself in about 5 minutes if you buy a reamer from Brownells. Link to comment Share on other sites More sharing options...
buckaroo45 Posted September 1, 2014 Share Posted September 1, 2014 I did my own 625 by renting a reamer from 4D. http://www.4-dproducts.com/ . I'm not connected, just a user. Link to comment Share on other sites More sharing options...
RaylanGivens Posted September 1, 2014 Share Posted September 1, 2014 I am interested in having this done in order to make my edge more reliable with coated lead bullets. Who would you recommend? What bullets and OAL are you using? Link to comment Share on other sites More sharing options...
Quack Posted September 6, 2014 Share Posted September 6, 2014 Finally got my throat reamer that was on backorder from Brownells. I took about 3 full turns to get .100" more OAL on a new 1911/2011 barrel for a build I'm doing. Easy to do and will be doing my CZ so I only have 1 load for all my 9mm's. Link to comment Share on other sites More sharing options...
SWprotected Posted September 7, 2014 Author Share Posted September 7, 2014 Thanks for the info. Link to comment Share on other sites More sharing options...
spraynpray Posted September 24, 2014 Share Posted September 24, 2014 http://www.midwayusa.com/product/771494/ptg-interchangeable-pilot-chamber-finish-reamer-40-s-and-w-cast-bullet-optimized I have used this reamer on four different 40 barrels and it works like a dream. I cast and size 200gr 40 cal bullets to .401 and a lot of STI chambers are way too tight for this setup. This reamer fixed all the problems I have had. Link to comment Share on other sites More sharing options...
Boxer1 Posted September 24, 2014 Share Posted September 24, 2014 The PTG reamer at midway does work very well for not only cast but also for longer OAL rounds as well. Link to comment Share on other sites More sharing options...
spraynpray Posted September 24, 2014 Share Posted September 24, 2014 A standard throating reamer will not necessarily help if the diameter of the projectile is an issue. The SAAMI spec for a 40 throat is .4014" max, so a .401" is a tight fit with some fouling and a .4015" is basically a no go. SAAMI specs attached. The vast majority of chambers and chamber checkers are made to these specs, thus the problems with lead projectiles. 40 SandW.pdf Link to comment Share on other sites More sharing options...
RaylanGivens Posted September 26, 2014 Share Posted September 26, 2014 Does the term "throating" apply to lengthening or increasing the diameter of the chamber? ...or both? Is a milling machine required to throat a barrel? Seems like it would be easy to ruin the accuracy of a barrel by throating incorrectly. Link to comment Share on other sites More sharing options...
Toolguy Posted September 26, 2014 Share Posted September 26, 2014 Just throating doen't change the chamber. It only cuts the rifling ahead of the chamber on a taper. A lot of chambers have too little cut in this area. This is a gentle hand powered operation. No mill or lathe needed. You probably could cut too much if you get carried away, but it's easy to get it right. Link to comment Share on other sites More sharing options...
RaylanGivens Posted September 26, 2014 Share Posted September 26, 2014 I thought barrels would be too hard for a hand twisted operation. Guess not... or it's that these throating tools are even harder than the barrel... So you grind a bit... then test fit a long bullet... then when the desired bullet fits, you grind a bit more... and probably test the fit with a new longer bullet designed to give the exact chamber length desired... or just test fit with a cartridge at the exact OAL desired for the maximum chamber length... Any recommendations for a throating tool for an STI Edge in .40 S&W? Thanks... Link to comment Share on other sites More sharing options...
Toolguy Posted September 26, 2014 Share Posted September 26, 2014 I prefer Manson or Pacific Tool & Gage reamers over Clymer. Just get a S&W 40 throating reamer. Should be the same one for 10mm. Barrels are actually pretty soft as steel goes. They cut easily unless chrome plated. Chrome plating will ruin a reamer in a hurry. Link to comment Share on other sites More sharing options...
ltdmstr Posted September 26, 2014 Share Posted September 26, 2014 Take a couple of turns with light pressure, clean and check. You may have to do this a couple of times. If you want to measure, stuff some modeling clay in there, put it in the freezer, then push it out to measure. Link to comment Share on other sites More sharing options...
Guest Posted September 26, 2014 Share Posted September 26, 2014 "Take a couple of turns with light pressure, clean and check. You may have to do this a couple of times...." Heed this advice.^^^^^^^ Reamers cut faster than you may think using just light hand pressure. I like to use transmission fluid (ATF) for a cutting oil, but there are other choices that work well. In any case be sure to use a cuttling fluid or oil. Do not turn the reamer backwards in the chamber, you can put a chip in the reamer or scratch the chamber. Not long ago there was a poster who asked a similar question and got a finishing reamer instead of a throating reamer and reamed out their chamber so much it swallowed the cartridge. Don't do that. If all you want to do is provide clearance for a long loaded bullet or a particular bullet profile so it doesn't hit the lands use a thoating reamer. It really isn't a hard task, but go slow and check often. Can't put the material back once you shave it off! Link to comment Share on other sites More sharing options...
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