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Rifles, Reloading, Optics, Equipment
Shotguns
Pinning or Shimming an 870 barrel with a cantilever mount.
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<blockquote data-quote="engineer40" data-source="post: 1122373" data-attributes="member: 90399"><p>Well I was very curious if I pinned/shimmed my 870 barrel if it would improve accuracy. It is a cantilever mounted scope. I understand both theories; 1) Probably won't help with accuracy because the scope is on mounted to the barrel 2) Might see some improvement because any movement is considered bad movement (like bedding an action of a rifle). </p><p></p><p>I found some very detailed instructions on shimming your barrel. I took my time and did a really good job. I was quite impressed with my work and got it shimmed probably 340 degrees of the 360 degree round shank. Very tight! Fit was perfect! </p><p></p><p>The test results are in! </p><p></p><p>No improvement in accuracy. At 100 yards, I was shooting 4 inch 5 shot groups before. And I'm shooting 4 inch 5 shot groups now. Bummer.</p><p></p><p>It's hard to look at 4 inch groups when I spend most of the year shooting rifles that are sub MOA...</p></blockquote><p></p>
[QUOTE="engineer40, post: 1122373, member: 90399"] Well I was very curious if I pinned/shimmed my 870 barrel if it would improve accuracy. It is a cantilever mounted scope. I understand both theories; 1) Probably won't help with accuracy because the scope is on mounted to the barrel 2) Might see some improvement because any movement is considered bad movement (like bedding an action of a rifle). I found some very detailed instructions on shimming your barrel. I took my time and did a really good job. I was quite impressed with my work and got it shimmed probably 340 degrees of the 360 degree round shank. Very tight! Fit was perfect! The test results are in! No improvement in accuracy. At 100 yards, I was shooting 4 inch 5 shot groups before. And I'm shooting 4 inch 5 shot groups now. Bummer. It's hard to look at 4 inch groups when I spend most of the year shooting rifles that are sub MOA... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Shotguns
Pinning or Shimming an 870 barrel with a cantilever mount.
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