T65

Scopes hold thier zero. So i don't think that is any cause for concern. Interesting that an oiled mount holds better zero. I have shot this rifle and it groups well. The problem is I don't know if I have a compounded problem with the scope, mount or rail. Zero is being obtained at 50m's not ideal but all I have to work with. Rifles have been zeroed at 200m's before but I did not take the readings. What I can deduce is Tikka 1) With scope 1 and the 1 piece mount. I have zero at 49 clicks to the left of mechanical zero. 2) With scope 2 and the 1 piece mount. I have zero at 29 clicks left of mechanical zero. This would seem to indicate that the rail and mount have a compounded error of 29 clicks if the mechanical zeros are true. However this does not explain the extra 36 clicks of scope 1 which should only have 150 and not 186. Plus the mount is machined from a single block so could this really be out of alignment? 3) With scope 1 and 2 piece rings. I have zero at 33 clicks left of mechanical zero. 4) With scope 2 and 2 piece rings. I have zero at 9 clicks left of mechanical zero. If I change to 2 different rifles I get the same readings on both rifles. 1) Scope 1 and 1 piece mount. Zero at 26 clicks left of mechanical zero. 2) Scope 2 and 2 piece rings . Zero is 7 clicks left of mechanical zero. No here is what really throws the figures out Scope 2 with 1 set of the 2 piece rings. Zero is 15 clicks right ?? of mechanical zero. I can only test with 1 set of the 2 piece rings as one set are to low. Alls these measurements have been tested twice with same results.

Rifle is a tikka T3 Tac A1 rings and mounts are picatinny.

Thanks for the replies. If i can explain some more. Scopes are fitted using torque wrench and even gaps either side. The problem I have is that my set up using 3 different mounts are giving me different readings. Using a 1 piece mount the error is 49 clicks left of mechanical centre and 33 clicks left of mechanical centre using 2 different 2 piece rings. If I change the scope. Same make and has the stated 15 mils (150 clicks) the error drops down to 26 clicks left of centre with the 1 piece mount and 9 clicks with 1 of the other 2 piece rings. If I change rifles the original scope and 1 piece mount changes to 27 clicks left and the 7 clicks left with the other scope. This repeats its self on the third rifle. Mounts and rings can only go on 1 way as they have built in bubble levels.

Hi Guys I have a scope which has a listed 15 Mils of adjustment. However it has a total travel of 18.6 Mils from left to right. So I would assume its mechanical zero is 9.3. I.e 93 clicks from centre either side. (Not wanting to name the make in case this biases opinion) How much when zeroing the windage would be acceptable for the scope to be offset from mechanical zero. Plus how much error is acceptable for the rings and rail combined. Shooting out to 1100Yards. Thanks Lee