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Posted: 1/24/2009 5:10:50 AM EDT
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I'm heading out tomorrow to zero the scope on my Barrett M95. The scope is a Leupold Mark 4 4.5x14x40mm. I've never owned a variable power scope so my first question is if there is a preferred power setting to zero the scope on? I've sighted in optics on my AR-15, but never on anything with the recoil of a .50 cal. Is there anything I should be aware of that's different or problematic when zeroing a scope on a .50? Also, any tips or tricks that you folks use? Thanks in advance!
Dan And because a picture is worth 1000 words... 
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That is way too cool.|
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I'm heading out tomorrow to zero the scope on my Barrett M95. The scope is a Leupold Mark 4 4.5x14x40mm. I've never owned a variable power scope so my first question is if there is a preferred power setting to zero the scope on? I've sighted in optics on my AR-15, but never on anything with the recoil of a .50 cal. Is there anything I should be aware of that's different or problematic when zeroing a scope on a .50? Also, any tips or tricks that you folks use? Thanks in advance! Dan And because a picture is worth 1000 words... http://i303.photobucket.com/albums/nn158/danfri81/50%20bmg/IMG_0927.jpg Zeroes just like any other rifle. Just make damn sure your scope is on good. Torque the cross bolts and ring screws to spec. loctite the cross bolts and ring screws. I use rosin between the scope and the rings. IF you don't do this right, the scope will move in the rings or the rings on your rail. Other than that, the best tip I can give you for a 1-shot zero is to do the following: 1. Have a big target. 2. Aim at the middle of the target at 100 yards. 3. Shoot one round. 4. Look for the shot on the target. If you hit the target, you are in good shape. 5. Aim the rifle back at the center of the target, exactly where you aimed when you took the shot. 6. Sandbag the rifle to be aimed at that aiming point and don't move the gun. 7. Turn the target knobs so that the crosshairs are on the bullet impact without moving the gun. 8. The rifle will then be zeroed, regardless of the distance. Works at 200, works at 1000. I zero at the highest power available on the scope so I know i'm aiming at the same point for both shooting and for adjusting. FYI I wouldn't zero initially shooting of the bipod. You'll have an easier time getting zeroed using sandbags. After you get pretty damn close, you can final zero from the position you plan to shoot from with the bipod. -David Edgewood, NM |
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Well David, looks like I should've taken your advice. I torqued the cross bolts and screws and brought the sandbags out to the range. It took me a few shots to get on paper, but once I was things went smoothly. I had it down to about an inch and a half off center at a little over 100 yards and then all hell broke loose. The next 2 shots were all over the place. Turns out I should've used loctite on the cross bolts because the scope came loose. So it should be pretty close to center now, but I'll have to loctite the cross bolts and head back out next weekend to finalize everything. Thanks for the help though. If I had followed your advice I wouldn't have had any problems.
Dan |
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1. Torque the cross bolts and ring screws to spec. 2. Use rosin between the scope and the rings. -David Edgewood, NM 1. How much should the bolts be torqued? Does adding Loctite to the threads affect the torque value? 2. Where would I buy rosin? Thanks. Torque depends upon your ring specs. Burris Extremes are around 60 INCH-Pounds on the cross bolts, around 10 INCH-pounds on the ring screws but don't quote me on that because I don't have a package handy right now. It's included in the instructions. Using Loctite (blue) doesn't affect torque values significantly enough to matter. Powdered Rosin is available under the brand name "Scope Grip" and available from Mounting Solutions Plus at the following web page: Scope Grip @ MSP. A container will mount a dozen or more scopes. I picked mine up when MSP was giving it away free a few years ago. Just q-tip a little inside the rings. Doesn't take much. -David Edgewood, NM |
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