Zero shifting when moderator put back on.

webley22

Well-Known Member
I currently have a wildcat mod on my sako. each time it is screwed back on (its off when in the cabinet) the zero seems to have moved from where it should be by a few inches up/down/left/right. Any ideas what could be causing this? Thanks
 

Brithunter

Well-Known Member
Obviously something is not lining up properly. I would be seeking expert advice and inspection of both rifle and moderator if it was mine and I could not see what was amiss myself.
 

webley22

Well-Known Member
Yes it has a bush, it seems secure. it will hold zero fine for however many shots it has through it until its taken off and then replaced at a later date. Dont know if it makes much differance but it usually shifts an inch or two to the left or right and down a bit, never usually up!!!
 

Cadex

Well-Known Member
I had something similar some time ago...........it turned out to be nothing to do with the moderator...........it was the screws that held the action in the stock that wernt tight.
 

jcampbellsmith

Well-Known Member
I had something similar some time ago...........it turned out to be nothing to do with the moderator...........it was the screws that held the action in the stock that wernt tight.
Cadex makes a very good point. I had a similar experience, it took a long time to home in on the action screws and ultimately Grant Taylor sorted the action screws and the bedding out. Not withstanding this comment, you need to go through a structured process of elimination to work out what is really the issue for you. Good luck. JCS
 

Dickyboy

Well-Known Member
Check the threads, they should be undercut. This means that there is a section between where the thread finishes and the full thickness of the barrel starts again. If not then you will not be tightening the mod to the same torque each time and this can have a massive effect on the zero. undercutting the thread means that the thread of the mod will start to exit the thread on the barrel and the mod wil hit and therefore sit squarely on the end of the rifle

If it was factory threaded it should already be done , if threaded by a gunsmith, use another one as a good gunsmith will know all this
 

ejg

Well-Known Member
I still try by just leaving the bush away. Biggest stupidity ever invented on a moderator.
edi
 

sir-lamp-alot

Well-Known Member
check the barrell is still fully free floating and that theres no crud jamming the barrell or that the stock isnt touching
 

bow

Well-Known Member
i had the same problem with the wild cat, would get it zero and when taken off it and put back on(same tention) it would have to be rezerod everytiime, i put it down to to the way they are built, not just myself but a number of mates as well,
changed back to a t8 and never had a problem,
 

JeffreyL

Well-Known Member
I think EJG is on the right track, try it without the rear bush. If that does the trick then open the bush out to give some clearance, make sure it has clearance all the way round.
 

james19306

Well-Known Member
I also had the same problem and never got to the bottom of it, then switched to ase utra and never looked back.
 

Pipmoff

Active Member
What model wildcat is it. I know people who had the early pre Predator 8 mods and they all had similar problems, they changed the mod and the problem was solved.
 

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