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Rifles, Reloading, Optics, Equipment
Gunsmithing
How much bedding compound do you leave in front of the recoil lug?
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<blockquote data-quote="Bart B" data-source="post: 1135074" data-attributes="member: 5302"><p>Shooting groups to see how pressure on the fore end that's contacting the barrel requires a human, rifle and ammo that shoots no worse than 1/10th MOA if you want to see a 2/10th MOA bore axis change from that external pressure.</p><p></p><p>Here's my method for fore end to barrel contact at the fore end tip......</p><p></p><p>1. install an optical collimator in the muzzle.</p><p></p><p>2. Zero the scope (at least 10X, more is better) reticule with its lower left hand corner barely touching the collimator reticule center so the smallest change can easily be seen.</p><p></p><p>3. Go into a normal bench rest position most folks use with the rifle's fore end and stock toe resting on something, then move around and notice how the scope reticule moves relative to the collimator reticule.</p><p></p><p>4. Do the same thing with normal field or range shooting positions and notice how much the barrel bends moving the collimator axis relative to the line of sight.</p><p></p><p>If the reticules don't move relative to each other, then the barrel's totally free floated. It's obvious to most that this method is better than any group shooting way.</p><p></p><p>To see the effects of a bedding pad under the barrel chamber area, first get a rifle so made and ammo that you can shoot into no worse than 1 MOA through 600 yards with 20 or more shots per group. Then shoot such groups at 600 starting with all the bedding in place, then after removing 1/2 inch of its front part and shoot another group. Such tests typically show vertical shot stringing shrink as more bedding's removed.</p><p></p><p>Barrels expand as they heat up. As they get larger in diameter in the chamber area across several shots, they bear harder on the bedding under them. That changes the barrels' whip parameter in the vertical plane. Not much, but very accurate rifles and ammo will show it if the shooter's up to the task. The chances of seeing it with most sporter rifles and people shooting them revealing what that bedding pad does is very small.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1135074, member: 5302"] Shooting groups to see how pressure on the fore end that's contacting the barrel requires a human, rifle and ammo that shoots no worse than 1/10th MOA if you want to see a 2/10th MOA bore axis change from that external pressure. Here's my method for fore end to barrel contact at the fore end tip...... 1. install an optical collimator in the muzzle. 2. Zero the scope (at least 10X, more is better) reticule with its lower left hand corner barely touching the collimator reticule center so the smallest change can easily be seen. 3. Go into a normal bench rest position most folks use with the rifle's fore end and stock toe resting on something, then move around and notice how the scope reticule moves relative to the collimator reticule. 4. Do the same thing with normal field or range shooting positions and notice how much the barrel bends moving the collimator axis relative to the line of sight. If the reticules don't move relative to each other, then the barrel's totally free floated. It's obvious to most that this method is better than any group shooting way. To see the effects of a bedding pad under the barrel chamber area, first get a rifle so made and ammo that you can shoot into no worse than 1 MOA through 600 yards with 20 or more shots per group. Then shoot such groups at 600 starting with all the bedding in place, then after removing 1/2 inch of its front part and shoot another group. Such tests typically show vertical shot stringing shrink as more bedding's removed. Barrels expand as they heat up. As they get larger in diameter in the chamber area across several shots, they bear harder on the bedding under them. That changes the barrels' whip parameter in the vertical plane. Not much, but very accurate rifles and ammo will show it if the shooter's up to the task. The chances of seeing it with most sporter rifles and people shooting them revealing what that bedding pad does is very small. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
How much bedding compound do you leave in front of the recoil lug?
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