Posted: 8/28/2007 3:26:02 PM EDT
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I know their barrels are great quality, but how much of an improvement are they? I have a Springfield Armory Loaded .45acp. I got it used. The previous owner sold it because it would not group well. I shot it and noticed it had a weird horizontal stringing. I sent it to SA and they replaced the barrel and bushing and refit the slide to the frame. It is very tight I am wondering how much a Bar-Sto barrel would help. I shoot bullseye with this pistol, and while I haven't yet measured my groups I managed to shoot a 777 with it. It has a C-More reddot scope on it, a Videcki trigger and a Wilson Bullet Proof extractor, but is otherwise stock. I handload and am currently using a 200gr LSWC over 4.5gr WST. I plan to try tweaking that load a little but it is fairly accurate as is. What groups would I reasonably expect from a handload and a stock barrel/bushing? Jim |
A match bushing? The crown on my barrel is good. I read that the match barrels are bored with the chanber concentric to the bore. I would have figured all of them were but I guess it's just to a closer tolerance. All of the match shooters who compete at high levels use match barrels, and I don't mind spending the money. I just wondered how much of an improvement I could expect. Is the fitting as critical as the parts themselves? Jim |
A factory crown on a production barrel is not as precise as it could be, the barrels crown imparts a drastic effect on accuracy as does the barrel lockup. Part of the Yost #1 package is a match grade bushing fitted and re-crown of the original barrel.  Most barrels are capable of more accuracy than the shooter is able to make use of. |
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Do you have a link to the specs of a target crown for a 1911 .45acp? I have a lathe- and a mill, so I can cut a crown, if I know what to cut it to. As for the bushing I will look into it. Mine is tight- no play that I can detect but my fingers haven't been calibrated in a while. Jim |
Per a post written by Chuck Rogers on the 1911 forum he indicates his barrel bores to .0005 concentricity over the last .500 of the barrel bore and then machines the crown... this concentricity and straightness is crucial as SGB points out, so that as the bullet escapes the muzzle, it does so with the gases perfectly centered so as not to interupt bullet flight. I machined my own in this fashion with great results...
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How many degrees is that cut at? (Nevermind the grammer) How much did it help? How did you get the crown cut concentric to the bore? Jim |
Nicely done |
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The crown is 40 degrees off centerline of the bore or 80 degrees included angle.. what is really important more than the angle is concentricity....you will see some different angles from different gunsmiths... I mounted my barrel in a lathe equiped with a 4 jaw chuck. Indicated the bore using a gauge pin slid inside the bore of the barrel.... Total indicator runout or TIR should be .0005 or less. Then I mounted a tool in the tool post of the lathe so that it was rigid and didn't chatter when machining... the compound of the lathe is moved to machine the angle. I discussed the potential of this process with Chuck when I had him on the phone for some work he did for me and in his experience, crowning a barrel will improve the accuracy some or alot. Either way you win... I just did the crowning when I fit the barrel and built my gun.... SGB... thanks |
