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Scope Bell To Barrel Clearance?

 
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  #1  
Old 05-27-2012, 12:01 AM
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Scope Bell To Barrel Clearance?

How close is too close is basically my question, my scope is very close! Hard to get a good picture but the gun shoots great but just a little worried about it in extreme weather conditions (conditions that I have not shot it in yet with the scope this close). It has an easy .005 of inch maybe a little more, no feeler gauge to measure though.

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  #2  
Old 05-27-2012, 05:33 AM
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Re: Scope Bell To Barrel Clearance?

I would not want it that close - the heat from barrel expansion after a shot or so could cause it to touch; not good.
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Old 05-27-2012, 12:46 PM
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Re: Scope Bell To Barrel Clearance?

Thanks gene. Went and purchased a feeler gauge and it was only .002" moved the scope forward a bit to get .015". I'm thinking that should be plenty
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Remington 700 7mmSAUM Magnum Research Barrel
Remington 700 7mm Rem Mag Ultralight
Remington 700 22-243 Supressed
Savage Target Action 6mm-284
Savage Target Action 6.5x47 Lapua
Savage Predator Hunter Max1 6.5-284 Norma
"Gotta Kill It Before You Can Grill It"
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  #4  
Old 05-30-2012, 07:58 PM
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Re: Scope Bell To Barrel Clearance?

That barrel won't expand enough from heat to touch a scope bell 2 thousandths above it. If barrels really expanded that much, their bore and groove diameters at that point would be large enough to cause serious accuracy problems. Folks shooting 26 to 30 caliber magnums once every 20 to 30 seconds for 20 to 30 shots get barrels very hot in long range matches. All bullets fired shoot well under 1 moa. There's more barrel and scope bell movement at that point from both whipping up and down when the rounds fired than any barrel expansion from heat will cause.

I'd get at least 1/16 inch clearance and more may be best on a hunting rifle. That way, if the rifle bangs around and something smacks the scope front bell, it will bend a little bit and still be usable after sighting in again. Otherwise, with near zero clearance, the bump may break the objective lens and then you get to use iron sights or buy the dream scope you've always wanted.
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