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#6105034 - 12/27/15 07:42 PM Scope base drill holes 0.450 apart?
syncerus Offline
Pro Tracker

Registered: 12/01/08
Posts: 1989
Loc: Dallas, TX
Hi everyone,

I just acquired a customized small ring Mexican Mauser that's been drilled and tapped. Unfortunately, the mounts didn't come with the rifle. The front pair of holes are drilled in the standard Mauser pattern and a spare Mauser front base fits well. The rear pair appear to be slightly non-standard. My extra Leupold M98 two piece rear base has holes drilled about 0.500 apart. The rifle's holes appear to be drilled about 0.450 apart.

The online base charts put out by the major vendors are useless as they don't provide the distance between drill holes, yet I seem to recall having seen such a chart in the past. Can anyone point me to such a chart, or does anyone know for which rifle or make the 0.450 drill pattern is standard?

Thanks
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#6105071 - 12/27/15 07:52 PM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
If you discover the holes were tapped in the wrong place on the reciever you could have the scope base milled to fit. My one Rem 700 action had the forward most hole offset to the left (pitiful!) I milled out the base to match the holes in the action. If you don't have a machine shop near by, mail the base to me with measurements, and I'll mill it to your measurements.
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#6105263 - 12/27/15 09:25 PM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
thedoveshooter Offline
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Registered: 03/02/10
Posts: 1191
Loc: Tomball, TX
I know a guy that has at least a half dozen rifles built on Mexican actions. I can check with him to see what his are. (shoot me a PM if you would like me to check) But, in all honesty, custom rifles can be drilled and tapped for any bases imaginable. If I were you, I would just take the rifle to Cabela's, BassPro, or Academy and try as many as you can find until you find one that works.


Edited by thedoveshooter (12/27/15 09:26 PM)
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#6105343 - 12/27/15 10:07 PM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
RiverRider Offline
THF Trophy Hunter

Registered: 11/11/07
Posts: 6217
Loc: Wise Co.
I have a bag full of weaver bases. I'll look through them and see if I can find one with the holes 0.450" apart and then cross reference it...unless the question is fully answered before I can get around to it.
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Originally Posted By: Cleric
God I am hating caliber threads more and more

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#6105543 - 12/28/15 06:25 AM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
beech96w Online   content
Tracker

Registered: 12/12/06
Posts: 713
Loc: Fort Worth
I had a 1903 sporter once, I had to weld up one of the holes in a Redfield base, and match drill it to the receiver.

Not ideal, but not hard.
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#6105763 - 12/28/15 09:05 AM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
syncerus Offline
Pro Tracker

Registered: 12/01/08
Posts: 1989
Loc: Dallas, TX
For the record, this is the chart that I had remembered seeing:

http://www.brownells.com/.aspx/lid=11214/GunTechdetail/W-R-Weaver-Company-Mount-Base-Specifications

Unfortunately, I don't see a 0.450 spacing. frown
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#6105773 - 12/28/15 09:11 AM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
RiverRider Offline
THF Trophy Hunter

Registered: 11/11/07
Posts: 6217
Loc: Wise Co.
Well...so much for a dead end idea.
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Originally Posted By: Cleric
God I am hating caliber threads more and more

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#6105827 - 12/28/15 09:38 AM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
syncerus Offline
Pro Tracker

Registered: 12/01/08
Posts: 1989
Loc: Dallas, TX
I emailed Leopold technical support; with a little luck, someone will know something.

BTW, thanks for all the offers of help, everyone. I really appreciate it.
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#6106802 - 12/28/15 06:24 PM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
charlesb Offline
Pro Tracker

Registered: 04/07/10
Posts: 1408
Loc: West Texas mountains
Then there is always the option of drilling an existing base to match, instead of altering the rifle. - Just a thought.

A one-pice base or picatinny rail would work for that.


Edited by charlesb (12/28/15 06:26 PM)
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#6108184 - 12/29/15 01:37 PM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
nsmike Online   content
Extreme Tracker

Registered: 05/02/12
Posts: 4216
Loc: MN
I don't have a lot to add but I do remember that there was a different set of scope bases for the FN small ring Mauser and the sporterized 98. The Mexican Mauser is a small ring also which may be why the holes are .450 apart
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#6344166 - 06/22/16 04:38 PM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
syncerus Offline
Pro Tracker

Registered: 12/01/08
Posts: 1989
Loc: Dallas, TX
While this is a zombie thread, it's worth mentioning that I finally discovered the answer to my question. The drill pattern was 0.436" inches apart. The pattern is from some old Mauser/M70 Weaver pivot mount bases, of all things.

Whoda thunk it?
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#6345391 - 06/23/16 04:13 PM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
RiverRider Offline
THF Trophy Hunter

Registered: 11/11/07
Posts: 6217
Loc: Wise Co.
So, how did you address the issue?
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Originally Posted By: Cleric
God I am hating caliber threads more and more

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#6345403 - 06/23/16 04:28 PM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
booradley Online   content
Pro Tracker

Registered: 01/20/11
Posts: 1692
Loc: Justin, TX
Cabela's only has the bases for FN Commercial Actions.
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#6345430 - 06/23/16 04:45 PM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
Classic Rocks Offline
Pro Tracker

Registered: 09/18/12
Posts: 1850
I am currently dealing with this. Small ring Mauser that no small or large ring bases will work with the spacing the receiver is drilled for. I am thinking someone had a spare base/bases laying around and drilled for them instead of the standard spacing.

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#6345574 - 06/23/16 06:25 PM Re: Scope base drill holes 0.450 apart? [Re: syncerus]
syncerus Offline
Pro Tracker

Registered: 12/01/08
Posts: 1989
Loc: Dallas, TX
I just bought a set of the discontinued Weaver pivot bases and rings.

We will see what we see.
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