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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Proof Research Switch Rifle
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<blockquote data-quote="reubenski" data-source="post: 1500399" data-attributes="member: 36515"><p>I have been using Bighorn TL-3s for switch barrels for two years now. I use shouldered barrels with a pair of "flats" machined just behind the muzzle threads to allow a 3/4" crowsfoot wrench to grab the barrel. I don't use witness marks, I just torque the barrel on to 40 ft/lbs. I've tested 20 and 30 ft/lbs as well. All work. I have even shot the barrel hand tight as and produced an excellent 10rd group! Several times I forgot my $30 autozone torque wrench and used a crescent wrench in my truck. The barrels don't know the difference. </p><p></p><p>I don't remove the barreled action from the stock or the scope from the receiver. I just remove the bolt, insert a magazine, and clamp the entire rifle in between my legs. This presents the business end of the rifle and the muzzle flats about chest level. I apply the torque wrench and remove the barrel. Screw the new barrel in by hand, and top it off with the torque wrench at 40'ish ft/lbs. </p><p></p><p>At this point I have barrels for the same rifle in: 6SLR, 6Dasher(2), 6.5 Grendel, 300BO, 223, and 308. Maintaining zero started to become challenging so I sold my old match rifle and used the funds to buy a 2nd TL-3 and identical chassis and trigger. Now all my barrels will "switch" across both my match rifles. </p><p></p><p>The return to zero is outstanding. Over the last two years I have yet to have a head scratcher. Now, the zero from one barrel to the next will obviously vary. The widest variation I have seen from one barrel to the next in zero (has always been windage) is .7 mrad using a 100yd zero. I usually just dial to the zero and hold for elevation and wind using Tremor reticles. I prefer the S&B scopes that have locking turrets for this application. I have also used the offset zero function in my Kestrel 5700 to spit out data using another barrels zero as the baseline (Not preferred). </p><p></p><p>I use standard bolt grease on the tenon threads. Thunderbeast brake adapters and their suppressors impeccable return to zero also make my suppressor "switchable" and universal. Being able to take a barrel off in 30 secs has made cleaning and measuring throat erosion/ chasing the lands incredibly easy. The TL-3's swappable bolt heads are the icing on the cake for this setup. Bighorn offers .223, SPC/PPC, .308, and magnum bolt faces making the action universal. I use Accurate Mag 223 AICS pattern mags for 300BO and 223. I trim the plastic front out of the internal sleeve to allow for 2.6" OAL in my 223 loads. </p><p></p><p>This rifle application is truly a skin walker!</p><p><img src="http://i.imgur.com/x1ltvOn.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i.imgur.com/ajboLVB.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i.imgur.com/Tx4dXTA.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i.imgur.com/ASmEVYW.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i.imgur.com/yobojm2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i.imgur.com/YM7seIV.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i.imgur.com/WGDVPed.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i.imgur.com/IwuaBpE.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i.imgur.com/3nUSmyf.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i.imgur.com/jBUIWjf.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i.imgur.com/eRFmsQi.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i.imgur.com/oOrkNUD.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i.imgur.com/LBdUcZY.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="reubenski, post: 1500399, member: 36515"] I have been using Bighorn TL-3s for switch barrels for two years now. I use shouldered barrels with a pair of "flats" machined just behind the muzzle threads to allow a 3/4" crowsfoot wrench to grab the barrel. I don't use witness marks, I just torque the barrel on to 40 ft/lbs. I've tested 20 and 30 ft/lbs as well. All work. I have even shot the barrel hand tight as and produced an excellent 10rd group! Several times I forgot my $30 autozone torque wrench and used a crescent wrench in my truck. The barrels don't know the difference. I don't remove the barreled action from the stock or the scope from the receiver. I just remove the bolt, insert a magazine, and clamp the entire rifle in between my legs. This presents the business end of the rifle and the muzzle flats about chest level. I apply the torque wrench and remove the barrel. Screw the new barrel in by hand, and top it off with the torque wrench at 40'ish ft/lbs. At this point I have barrels for the same rifle in: 6SLR, 6Dasher(2), 6.5 Grendel, 300BO, 223, and 308. Maintaining zero started to become challenging so I sold my old match rifle and used the funds to buy a 2nd TL-3 and identical chassis and trigger. Now all my barrels will "switch" across both my match rifles. The return to zero is outstanding. Over the last two years I have yet to have a head scratcher. Now, the zero from one barrel to the next will obviously vary. The widest variation I have seen from one barrel to the next in zero (has always been windage) is .7 mrad using a 100yd zero. I usually just dial to the zero and hold for elevation and wind using Tremor reticles. I prefer the S&B scopes that have locking turrets for this application. I have also used the offset zero function in my Kestrel 5700 to spit out data using another barrels zero as the baseline (Not preferred). I use standard bolt grease on the tenon threads. Thunderbeast brake adapters and their suppressors impeccable return to zero also make my suppressor "switchable" and universal. Being able to take a barrel off in 30 secs has made cleaning and measuring throat erosion/ chasing the lands incredibly easy. The TL-3's swappable bolt heads are the icing on the cake for this setup. Bighorn offers .223, SPC/PPC, .308, and magnum bolt faces making the action universal. I use Accurate Mag 223 AICS pattern mags for 300BO and 223. I trim the plastic front out of the internal sleeve to allow for 2.6" OAL in my 223 loads. This rifle application is truly a skin walker! [IMG]http://i.imgur.com/x1ltvOn.jpg[/IMG] [IMG]http://i.imgur.com/ajboLVB.jpg[/IMG] [IMG]http://i.imgur.com/Tx4dXTA.jpg[/IMG] [IMG]http://i.imgur.com/ASmEVYW.jpg[/IMG] [IMG]http://i.imgur.com/yobojm2.jpg[/IMG] [IMG]http://i.imgur.com/YM7seIV.jpg[/IMG] [IMG]http://i.imgur.com/WGDVPed.jpg[/IMG] [IMG]http://i.imgur.com/IwuaBpE.jpg[/IMG] [IMG]http://i.imgur.com/3nUSmyf.jpg[/IMG] [IMG]http://i.imgur.com/jBUIWjf.jpg[/IMG] [IMG]http://i.imgur.com/eRFmsQi.jpg[/IMG] [IMG]http://i.imgur.com/oOrkNUD.jpg[/IMG] [IMG]http://i.imgur.com/LBdUcZY.jpg[/IMG] [/QUOTE]
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