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November 8, 2012, 04:04 PM | #26 | |
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November 8, 2012, 04:43 PM | #27 | |
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November 8, 2012, 06:20 PM | #28 | ||||||||
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Saskhunter comments about my question; "What difference is there between them that would make one react differently from contact with a stock's fore end compared to the other?" and my comments below each:
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Those ugly thing sliding back and forth on barrels do work. Especially with rimfire match rifles where a lot of them are used. Very efficiently, too. Centerfire rifles typically don't benefit from them, but sometimes they will. Quote:
Bolt action match rifles have been built the same way with that steel block glued into the stock's fore end; I've watched them shoot just as accurate as a conventionally epoxy bedded receiver with its barrel totally free floating. Quote:
http://archive.org/details/philtrans05900167 Also, check out these links: Fluted Barrel Analysis 22LR Rifle & Tuner Esten's Rifle & Tuner Light Rifle & Tuner Barrel Harmonic Movie Barrel Tuner Analysis 6PPC Barrel Dynamics in Varmint Al's web site below: http://www.varmintal.com/ I also know that barrel harmonic frequencies are multiples of the barrels resonant frequency. And a barrels resonant frequency it whips or vibrates at is different if both ends are free compared to one end screwed into a receiver that's bolted (or glued) into a stock. A given barrel in a rifle has a resonant frequency about one third what it does when both ends are free. Note also that some modern 28 to 30 inch match rifle heavy barrels are more whippy (less stiff) than shorter, lighter weight hunting rifle barrels. Quote:
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Military match grade M1 and M14 match rifles have been clamped in accuracy cradles and test fired with known good lots of match ammo. The best of them would shoot darned near 1/2 MOA at 600 yards; takes about 1/4 MOA at 100 yards to do that. Yet their stock's fore end ferrule holding the barrel down with about 30 pounds of pressure that actually bends the barrel (and therefore the bore axis from there to the muzzle) down relative to the bore axis at the chamber. But it does so with exactly the same external force on the barrel from shot to shot so it's very repeatable. When the fore end's hand held in shooting positions, that has to be very repeatable else point of impact relative to the aiming point will change. Last edited by Bart B.; November 10, 2012 at 07:51 AM. |
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November 8, 2012, 06:30 PM | #29 |
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Join Date: April 6, 2008
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From what I have read, the glue in idea was happened upon by accident. A shooter forgot to put releasing agent on the action and hence.. the glue in.
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November 10, 2012, 02:32 PM | #30 |
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Y'all can argue your "theories" all day long but I have proven that coyota1 and Saskhunter know of what they speak. My 25# free-floated Remington 700 custom built bench-rest rifle with extra heavy varmint barrel will shoot the same hole all day long no matter hot it gets. My "factory" sporter barreled 700 in the original stock "barrel touching the stock" will shoot a 1" hole at 100 yds. no matter how hot it gets. HOWEVER when I put it in a free-floated stock it shoots complete different. First cold shot.. dead center. Second, third and forth 1/2 left 1 1/2" low all in the same hole. Then it starts walking farther left and lower until it's shooting 1 1/2" to 2" left and 2 1/2" to 3 1/2 low. Let the barrel get cold and it start the exact thing all over. Put it back in the original stock and it'll shoot 1" groups in and around the bull all day long. Your millage may vary.
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November 11, 2012, 04:33 PM | #31 |
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I went to a lot of trouble making this part last month. It is a scope mount - for arm mount - bi pod tube mount for an 1885 falling block action. I wanted to have a bipod near the muzzle and not bend the barrel. I see now that the lens cap is touching. In many floated barrels there is a hand gaurd tube that is concentric with the barrel. This one is not. The tube is below the barrel.
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