Scope Grooves Mis-Aligned ??

[WALKERs210]

I have a Marlin 17HMR bull barrel, bolt action rifle that I've had for some time. First scope I put on it was rather a cheaper one but at the time I didn't want to take one off another rifle. Last night before bed I put one of my better scopes on it, pulled out a BSA Bore sighter and had issues trying to get the windage adjustment on the grid. I know that this bore sighter is not the best in the world but most times it will get me on paper and then can go from there. Today it took me around 5 shots to even see it hitting anywhere close to the back board. Had to hold the scope about two feet to the right and with two targets side by side I was hitting in the 8-9 ring on the left target. Started turning the adjustment and after running completely out of any more adjustments. Elevation was right on but didn't want to waste more ammo chasing the target.

Came back into the house removed scope from the two piece mounts, put level on it and the front one was tilted way to the left. Put a straight edge and both line up great, I took front mount off and shimmed up the right edge to bring both mounts to an even keel. Mounted a different scope and pulled out the bore sighter again, the scope was dead on for elevation and again way off for windage. After turning the adjustment in as far as it would go I finally got it centered. But for some reason I don't feel that this is going to be the final fix for it. What am I over looking, at this point I am looking at changing the 2 piece mount for a single piece that might keep everything inline. Any ideas or suggestions will be greatly appreciated.

 

[frankenstein406]

Dovetail groove on the receiver machined wrong?

I think leapers has one piece mounts that are popular.

 

[WALKERs210]

Ok Problem solved (I think). From what I could estimate the grooves are in fact about .5 mm out of dead center alignment. Dug thru my cases and found a set of mounts that allow adjustment from each side which aligned much better.

 

[Outlaw Man]

That's definitely the easiest fix if it works. Best of luck.

 

[WALKERs210]

Let's cross our fingers and toes to hope that this is a fix. Sure would hate duck taping scope on here to keep it where it's suppost to be. An if the Duck tape don't work still have some bailing wire that will wrap around to.

 

[Outlaw Man]

If that doesn't work, there's always JB Weld and a Dremmel tool!


For those who can't tell my sarcasm: DO NOT actually try that!

 

[WALKERs210]

OutLaw Man if I thought that it had a chance I have no problem using anything including JB and dremel tools. Sometimes you just gotta do what it takes.

 

[eastbank]

i bought a real nice rem 722 in 308 for a good price and when i mounted a scope on it useing weaver bases i found out the front base holes were not straite in line with the barrel(maybe a good price because of that). after thinking it over and looking at it i dug out a set of redfield bases with the windage adjustments on the rear base, it took care of the problem and the rifle shoots 1-1-1/4" groups at 100yds right in the center of the target. eastbank.