Can't come back to 100yds zero

B

Black Jack

CGN Regular
Rating - 100%
13   0   1
Location
Ottawa
Hello guys, I shoot a rem700 in 308. I have a Bushnell Elite 4200 6x24x42 installed on it. I usually shoot some 168gr A-max. A while back I bought some 155gn A-max to shoot through my M305. All went good with the 305 and I also tried some in my Rem 700. For some reason I couldn't get to zero my scope at 100yds with the 155gr. I didn't thought anymore of it because I wasn't planning to really shoot more than that, it was only to see the difference on target. Then I didn't shoot for a while and a few days ago, I reloaded some 168gr to go shoot before going hunting. Now my problem---> Even with the 168gr that I used to shoot at 100yds for ever, I can't get back to my zero. I bottom out before being back to zero. I didn't change the rings, the scope, the rifle or any components of my reloading because it was still some stuff I had before I tried the 155gr. So same powder, same bullets same primers. All that coming from the same boxes from before, didn't change anything on the rifle and I can't zero like before. What am I missing? Is it possible that a turret would "lock" on a scope. It turns just great going the other way. Now my zero is somewhere around 250yds according to my hits on paper at those ranges. Current location of the shots at 100yds are 2" too high. I'm not sure where to start to look or what could of happened. Is the scope defective? Any of you guys ever had similar problems with a scope? Looking for help :confused::confused: Tks
 
I suspect you are using a hotter load with your 168's than you were before, or the change in temperatures is giving you higher velocities. I suspect the scope was always very close to being bottomed out and you did not realize it.

If you have changed nothing, check the following:

Does the scope have set screws on the turrets to allow you to set a proper zero? If so, back these off and see if that gives you more turning room on the turret knob.

That your base is properly screwed and torqued down (use blue loc-tite)

That your rings are properly installed (is there a front and rear ring? Some tope end rings are designed this way)

Are you using a tapered base? - I cannot shoot closer than 350M with one of my bases

If this is a non-tapered base and your rings are not tapered, then you have a scope problem. Return it and get it fixed.
 
I did check if the adjustment loosen would give me more room. Didn't change anything. My loads are exactly the same as before, but still checked it out to make sure on 2 different scales. My rings are standard and were never removed. I believe my scope will have to go visit Bushnell :(

Thks
 
Most of us would probably consider 2" hi at 100 yards to be the perfect zero for a hunting rifle.

Do you have a collimeter? I would use that to see how much "UP" thre is in the scope. If it is suppsoed to have 60 minutes of vertical adjustment, and the collimeter shows that you do, then there is nothing wrong with the scope. The problem you have is common after installing a tapered base.

if there is nothng wrong withthe base, or scope, then all you need are rings with some vertical adjutment. I think it is Burris that has the rings with the plastic ring inserts that can be used to adjust the scope. You want to raise the front of the scope about 5 thou.
 
You must log in or register to reply here.
Back
Top Bottom