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OK here is a thought. Off center scope base holes.

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d4570 View Drop Down
.416 Rigby
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Topic: OK here is a thought. Off center scope base holes.
    Posted: 08 January 2021 at 08:00
On my junkyard, 6mm rem the scope base mount holes don't run straight to the bore.
To fix this I have Burris mounts with 30* offset bushings. And I took a blank base and drilled the hole off-center to make it plum or at least close.
It is a Herders j6 ( ? ) Mauser 98 action. I'm kinda thinking about changing the barrel to a better twist like R5 1x10 or a bit faster.
I'm thinking about trying some longer/heavier bullets that the 1x14 won't shoot.
I have been checking around and most Gunsmiths will not fix the base mount holes. I guess the Mauser actions are tempered very hard and it never works. Here is a thought. The rear holes seem to be good it is the forward one that seems to be off. If I was to not change the rear holes and mount the rings and Use a lapping rod, I use a piece of steel the same size as my scope, but long. Then if I mount the ring and base to the rod, not the barrel. Then bed the base with resin and let it fill into the hole for more grip. basically, gluing it to the action? Do you think it would hold?
The problem with what I have is the off-holes set the base off-center of the round action is it Twists the ring and I think at some point the line of sight out at 600 yards and past will be off. I had a ring break where it attaches to the base so I know it is on a bind. Right now it is a Laser and I have killed one-shot many deer/antelope well past 400 yards. What do you think?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BEAR Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2021 at 11:03
I assume you have two piece Weaver bases?

If so, I'd plug the holes with a scew, lock tited in and heads ground flush.  Making sure the screw doesn't protrube into the bolt area (a common problem).  Then I'd get a new front Weaver base and drill new holes in it; they are aluminum but away from the existing holes.  Then drill and tap the front receiver ring to align with the bore and the new holes.  A good smith can do.  Many receivers are HARD, and might require some 'softening' at the new hole sight.  In the 50-60, this was common with all the mil surplus springfield and mausers.

I'd not epoxy!!!!   Why, as range officer I was assisting at a sight-in day.  One dude was having trouble getting his gun sighted in, and asked for help.  After watching him shoot two (30-06) I suggestedd his scope might be loose, and I got y gunsmith tools down to his bench.  As I touched the scope to wiggle it, off it came in my hand.  Seems it was just epoxied on (with J-B weld if I recall).  Both surfaces were a smooth as glass.  recoil shearedd it off.  Now, I don't know if it was done badly, no clean of oil, or what?

I've epoxied fron sight ramps on and they have never falled off; BUT front sight are very light weight compared to a scope and mounts.



How far from the cented line are the two front  receiver ring holes??

Just thoughts.
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d4570 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2021 at 12:57
"I assume you have two piece Weaver bases?"

Yes.
If the reserver was flat I would just do what I already did.
Get a blank base and drill a hole. With the holes off it moves the mace over the center line with only part of the base. I heed a base that is thicker on one side.
About 1/2 a bolt on one and like 3/4 a hole on the net one.
The few "smiths" I have talked with sad they would not attempt to do it.


Edited by d4570 - 08 January 2021 at 13:02
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Wing master View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wing master Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2021 at 14:39
I can understand them not wanting to do the job. If you plug the hole with a screw the screw material would likely be softer than the hardened receiver. Trying to drill a straight hole in half hard and half soft material would be difficult to say the least. I would think a good metal guy could anneal the receiver, drill the holes, then heat treat it back to at least close to the original hardness. 

It might be something to ask the machinest that helped you out on your water bug project about. 

Anyway, I think a solution might be to use the bases that you have now that are drilled close to the centerline of the bore and use Burris self centering rings. 

Just a thought. 

Wing master
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jsgbearpaws1 Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2021 at 14:50
Tamper with the action integrity with a strong possibility to make it no longer usable or the cheaper and safer route with adjustable rings....let me contemplate that for a bit...
...oh yeah! thats gonna hurt!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MapleHill Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2021 at 16:03
D, in my experience working as a diesel tech my whole life, trying to drill next to an existing hole is not gonna work, even if you put a screw in the wrong hole and drill next to it. The correct hole location would have to be completely clear of the existing wrong holes. A couple things I can think of...one would be a blank base like you mentioned. One where the front holes are totally clear of the existing ones (crooked). Another option is have the base permanently fixed to your receiver. I have a friend that was a sharpshooter for the FBI and they had the bases welded to the receiver of there service rifles, Rem 700s in there case. If your rear holes are correct (straight) then fasten the base with them and have a machinist/smith spot weld the front. I seen the gov't rifles and they were welded almost completely around! I wouldn't go that far, but a small maybe 1" bead around each side on the front by the holes would work. That fix would be permanent/semi-permanent so I would make sure it's what you want.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wing master Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2021 at 16:44
Good point JSG. 

Wing master
I have always considered myself to be quite the bullshitter, But ocasionally it is nice to sit back and listen to a true professional......So, Carry on.
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