dmize
.401 Bobcat
Posts: 2,834
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Post by dmize on May 31, 2011 11:27:39 GMT -5
This weekend I ran a couple rounds thru my pet longrange rifle.
Its a Savage 110 Tactical 300 Win Mag,Choate Sniper stock,Sharp Shooter trigger,and a 3.5x10 Leupold Tactical scope in Leupold mounts.
This rifle will shoot 1/4 inch groups on a daily basis at 100 yards and will stay inside 3 inches at 400 yards.
Now here is the puzzling part,as ranges increase the bullets start hitting to the left,at 400 it will shoot its groups almost 3 inches to the left, and its not wind,does it early in the morning when its dead still.
Anyone have any ideas or insight?
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Len
.30 Stingray
Posts: 358
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Post by Len on May 31, 2011 11:38:00 GMT -5
Bullets tend to drift in direction of barrel twist also is your scope level?
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dmize
.401 Bobcat
Posts: 2,834
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Post by dmize on May 31, 2011 11:46:24 GMT -5
Yes scope is level. Even did this with a different scope.
I have had it for about 12 years and have checked all the normal stuff.
Its not really an issue,I have corresponding windage corrections on my range card. Last year I whacked a doe at 375 just dialed 8 up and 3 right and pinwheeled her.
I was just curious as to what could cause it to act that way.
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gunzo
.30 Stingray
Posts: 423
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Post by gunzo on May 31, 2011 11:59:14 GMT -5
My first guess would be that the scope is tilted in relation to the rifle or the rifle is out of level in the bags or on a bipod. The farther you crank up the elevation, the more the bullet impact is going to yaw in the direction of the tilt. I fixed mine by leveling the rifle, drew a 36" verticle line on a target with a 4' level, then without affecting the rifle level, I loosened the scope & aligned the cross hairs with the verticle line. I then confirmed by getting a very good 100 yard zero & then cranked up the scope 36 moa. Using the same aiming point I fired another group. The group was 36" high & centered well on the line. I set zero on my knobs & have been a happy camper since. Now I just have to remember to keep my cross hairs good & verticle. Hope this wasn't too long winded but my results were good. 2-4 mph wind:   |
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gunzo
.30 Stingray
Posts: 423
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Post by gunzo on May 31, 2011 12:10:54 GMT -5
OK, my typing is slow & wasn't aware that you & Len had addressd the level question.
I think Leupolds are damn good scopes but have seen some that the cross hairs are not level with the turret. The crank up test I tried to explain may show something.
Len is spot on about effects of barrel twist & there is even the rotation of the earth to consider, but I havn't really noticed that inside 6 or 700 yards, maybe its there & I haven't recognized it.
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