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Rifles, Reloading, Optics, Equipment
Gunsmithing
Timing a Barrel, how much impact in Long Range?
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<blockquote data-quote="James Jones" data-source="post: 181129" data-attributes="member: 8843"><p>The barrel is restng on the outside , the static resthas two pairs of wheels that just cross eachother and is adjustable for the sapce you need.</p><p> </p><p>Now I know what your thinking , the outside of the barrel is not concentric with the bore for all 360 deg and in alot of cases your right but for the most part the barrels are finish turned on centers so if proper care was taken to not get carried away with tool pressure and the follow rest is setp right they will be amazingly close but some are way out !! , in either case you will egneraly get a we bit of runout on the breech end maybe .0001" or so and that is taken into consideration. I saw a barrel one time that was to be setup for a Savage nut systen that wa so far off the bore that the threads coulden't be cut correctly so their are some turds out their.</p><p> </p><p>some guys swear that your barrel has to be supported at the muzzle and dialed in as accurately as the breech when the chamber is cut , but think about it , if your muzzle and breech are both running true with no runout than neans that their is a curve midstream right? Now I indicate my barrel at the muzzel but it is dialed in for the runout I found earlier , another way( much easier) to check this is to use a long needle finger on the dial indicator and rather than using a range rod you simply run the needle into the breech end once right at the mouth and one run further inside where the throat will be and get the barrel running strait this way. I was shown this buy a guy that builds gun for shooting world record quality BR match and is in the BR hall of fame. He dials his barrel in with a brass bushing slid up snug on the barrel about half way down and it rides just loose enoguh to not bind in the bore of the lathe and he dials in by adjusting a "set true" 3 jaw chuck , we argued a bit about ths process and he made a believer out of me , he guarntees his hunting guns up to magnums to shoot 3/8" or less and his bench guns shoot in the .1's or they are fixed !! its kinda hard to argue with figures like that and the fact that he holds some BR world records.</p></blockquote><p></p>
[QUOTE="James Jones, post: 181129, member: 8843"] The barrel is restng on the outside , the static resthas two pairs of wheels that just cross eachother and is adjustable for the sapce you need. Now I know what your thinking , the outside of the barrel is not concentric with the bore for all 360 deg and in alot of cases your right but for the most part the barrels are finish turned on centers so if proper care was taken to not get carried away with tool pressure and the follow rest is setp right they will be amazingly close but some are way out !! , in either case you will egneraly get a we bit of runout on the breech end maybe .0001" or so and that is taken into consideration. I saw a barrel one time that was to be setup for a Savage nut systen that wa so far off the bore that the threads coulden't be cut correctly so their are some turds out their. some guys swear that your barrel has to be supported at the muzzle and dialed in as accurately as the breech when the chamber is cut , but think about it , if your muzzle and breech are both running true with no runout than neans that their is a curve midstream right? Now I indicate my barrel at the muzzel but it is dialed in for the runout I found earlier , another way( much easier) to check this is to use a long needle finger on the dial indicator and rather than using a range rod you simply run the needle into the breech end once right at the mouth and one run further inside where the throat will be and get the barrel running strait this way. I was shown this buy a guy that builds gun for shooting world record quality BR match and is in the BR hall of fame. He dials his barrel in with a brass bushing slid up snug on the barrel about half way down and it rides just loose enoguh to not bind in the bore of the lathe and he dials in by adjusting a "set true" 3 jaw chuck , we argued a bit about ths process and he made a believer out of me , he guarntees his hunting guns up to magnums to shoot 3/8" or less and his bench guns shoot in the .1's or they are fixed !! its kinda hard to argue with figures like that and the fact that he holds some BR world records. [/QUOTE]
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Timing a Barrel, how much impact in Long Range?
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