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Custom work on a scope base ?'s

This is a discussion on Custom work on a scope base ?'s within the Gunsmithing forums, part of the Firearm Forum category; Hi guys I have posted a thread in the optics section about my problems trying to find a one piece scope base for my Savage ...


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Old January 7th, 2017, 09:07 PM   #1
 
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Question Custom work on a scope base ?'s

Hi guys I have posted a thread in the optics section about my problems trying to find a one piece scope base for my Savage Model 99. From what I have found online my rifle looks to have been fitted up with a early Redfield JR 99R one piece scope base. When I got my rifle it has the 3 holes tapped and drilled on this gun for a one piece scope base. I found out at the LGS this past Friday that my gun according to the serial # was made in 1936! The mechanical condition of this rifle is actually quite good for the age. My problem is the spacing on the three holes on my rifle will not match up with any of the one piece scope base's now made! I bought a Leupold one piece scope base for a Savage 99 #49995 in hopes it might be able to get some machining done to it to make it fit the holes drilled in my rifle's receiver. Out of the three holes on this new base the back 2 holes are close but still off enough to not work. My question is this if I leave the rearward hole as is, can the next two holes be welded and then re-drilled to fit my rifles tapped and drilled holes. My fear is welding this mount will cause the temper and hardness to be to the point that it cannot be machined and drilled out to fit my rifle. If I leave the rearward hole as is my son in law said that the 2nd rearward hole that if the top was first drilled down just far enough that the shoulder of the machine screws would partially seat then another hole to drill out to basically elongate this hole that I could then use the 2 rearward holes. It appears that there would be enough metal on the forward receiver where the barrel threads in that another hole could be drilled and tapped into my reciever. Basically that on the receiver where the barrel threads in that one hole could be tapped into my rifle then be able to use this Leupold #49995 base on my rifle. I do not know if what I have mentioned would work or not. I can just use this rifle with open sights but my eyesight isn't that great at my age thus I use a scope. This rifle is a .300 Savage my intent is to just use it as a shooter now knowing that the alteration with adding 3 holes tapped and drilled hasn't helped the value either. Also on the very back of the receiver it also appears this rifle had been fitted with some sort of peep sight these two holes are now filled with the plug type of screws you see on top of the receivers of rifles for scope mounts. I have seen a rearward scope base called a Sith mount. I am guessing that the holes that are on the rear of my rifle for a peep sight would work with a Sith mount. I have actually seen a rear Sith mount online for sale probably on ebay. But if I found a Sith mount what can I do for a forward scope mount base etc?? I am just trying to get ideas etc if I can get a scope mounted on my Savage Model 99 or not!!! I do not want to spend a bunch of money if its a waste of time. I do not mind spending no more then $100 dollars etc I already have a good scope. The perfect solution would be to find the Redfield Streamline JR 99R Scope Base. one last question is there a one piece picatinny rail with a offset in it like most of your one piece base's that could be altered to fit my rifle. Where most of the picatinny rails are made out of aluminum. I have tried to google it and looked on Gun Broker and ebay so far nothing. Whew so sorry for going on and on. I welcome any comments & or ideas to get this rifle scoped. Thank you so much



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Old January 7th, 2017, 09:25 PM   #2
 
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When drilling new holes that are touching existing or older holes that have been welded shut there is a tendency for the drill to drift over to the softer welded holes.

Possibly the base might be cut apart in two sections so that blank undrilled steel might be on top of the holes enabling holes to be drilled in position then the base would be welded together to the correct length.

Some sight manufacturers make "gun smith" bases that may be contoured and then drilled to fit.

Welding the base will not affect drilling holes on undisturbed steel or base strength.

Sounds like a visit back to the 30's - M99's and such. That rifle is older than I and almost everybody visiting this forum.
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Old January 7th, 2017, 09:52 PM   #3
 
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Ok where can I find a gun smith scope base?? I was told at the LGS it might be easier to cut my Leupold base in half to match up the holes etc then weld it up. Yes this rifle is a real antique but surprising it cleaned up quite nice from when I found it. It could be reblued but thats more then I want to spend. I did a cold blue to help it out and it turned out good. It also needs some minor stock work etc. I wanted a project gun but not break the bank in the process. Like I stated its a shooter because of the modifications etc. but if you can point me in the way to get a gun smith base hey I will do it. I haven't been able yet to find a gunsmith maybe then I can get some things decided. Thanks for your comments and suggestions I wonder do the gunmith scope base's have the offset built in like my Leupold base does. If the Leopold base could be cut and rewelded to match up the two rearward holes I think that another hole drilled and tapped into the top of the rifle receiver would presto get a scope mounted thanks!!!
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Old January 7th, 2017, 11:06 PM   #4
 
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My research department came up with the following:

Brownell's

Picatinny Type - will accept Weaver type rings

296-000-145WB aluminum 59.99
296-000-144BB steel 69.99
100-003-790WB aluminum, white about $30
100-000-682WB aluminum, black?, 28.16

these are one piece, need to be cut down from about 6 inches, are flat bottomed and need to be radius cut and 3 holes drilled - the white aluminum would be ugly and need to be finished with some black coating that might be tacky. The 3 existing holes would work.

AND

The best would be the Leupold Gun Maker's (gun smith ?) 2 piece Base Blank, polished blue steel, rotary dove tail front, windage screw back -- these would need to be radius cut on flat bottom then drilled & countersunk. One hole would be needed to be drilled and tapped in the 99's receiver - 2 holes per piece -drill holes in base to match holes in receiver.

526-413-490WB front dovetail
526-413-500WB rear windage

I would go for the Leupold Gun Makers 2 piece set up using Burris Signature rotary dovetail ring front and windage screw back.

Possibly, you might be able to buy them directly from Leupold, Brownell's is sold out or needs to be back ordered for the front dovetail ring.

I like Brownell's Oxpho Blue - apply enough then rub a lot.

Last edited by BassMan; January 7th, 2017 at 11:22 PM.
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Old January 8th, 2017, 07:01 AM   #5
 
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As I explained in the PM, your best bet is going to be to just buy the base you want, take it to a smith and have it installed. Trying to custom make a base to fit existing holes, is going to be very time consuming, because of the way the Savage receiver is made.

Also, your multiple posts are confusing. At one time you said it had two holes in the front and two holes in rear and now you say it has 3.............so which is it?

But here is what I would do and I think would be the quickest and easiest. You say the rear holes are CLOSE on the Leupold mount. So that means the existing holes are close to what is considered standard.............SO, I would buy the correct Weaver mounts and have whichever hole needed it, slotted on a mill to fit your receiver. The rear is the issue because of curve of receiver. The front is flat, so you buy the correct weaver base for this, line up the hole you have and punch another in receiver to hold that base.

After looking at my own Savage, yours seems to be an easy fix, just likely not a home fix.
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Old January 8th, 2017, 12:05 PM   #6
 
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I can see why my post is confusing as well thanks! I have 5 holes drilled into the top of the receiver of this rifle the 2 most rearward holes are a tad larger these holes I was told at the LGS are for a peep sight. I rear Sith type of scope mount would fit this hole but then what to use forward? I have put screw plugs into these holes and going to forget about them. The next three forward holes are for the one piece scope base. The first one is just forward of the chamber indicator the next two are on the receiver where the barrel threads in these two forward holes are .75 apart. Here is what I gave thought to both msp3903 & BassMan have said. Today I came up with this. I mounted the Leupold #49995 one-piece base on top of the Savage 99 receiver I looked it over decided to use the rearward hole by the chamber indicator to fasten the scope base down to the receiver this is what I now find. The next hole doesn't line up at all, so just put a screw plug into this hole (receiver) But then the farthest on the scope base there is good metal right there on the receiver to drill and tap a new hole the receiver so now two screws holding this base down. I can now have one other thing to do for three screw fastening. I have the most forward screw hole still not being used thats on the receiver. I could have another hole machined/drilled into this scope base to line up with the farthest most existing tapped hole thats in the gun & presto this is done and get on with it. Doing this does make two forward mounting screws very close but enough metal to do it. My thoughts are why not use a existing hole with the forward hole already there. So I am going to leave the Leupold base on this gun and take it to a gunsmith and see if I can use what I have without having to cut and weld the current scope base that I have. This gun can be made into a nice little shooter its not a collector it could have been but then some dummy installed a scope then when I got it the dummy who had handed this gun down he had removed the scope base that I need!!! Oh well give me your thoughts I do appreciate the feed back thank you very much!!!

Last edited by gqucool; January 8th, 2017 at 12:44 PM.
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Old January 8th, 2017, 12:24 PM   #7
 
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Think about using a peep sight. I have bad eyesight and a custom peep sight on my mini 14 allows me to do minute of deer out to 100 yards. I am not going to shoot deer with a 556 except in a survival situation but just for an idea.
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Old January 8th, 2017, 12:31 PM   #8
 
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Ok, so we have two holes above the barrel tenon and one hole in front of indicator.......correct? No guarantee, but it would not surprise me if that front hole spacing was correct for Weaver base, or one could be easily drilled in base. Then maybe use the one hole in the back and drill the other in receiver where it needs to be.

While your plan with Leupold base doesn't sound bad, there is more to it than just the holes lining up. First the rifle needs to be clamped in a vice with barrel level. Then place the scope base on receiver and it has to be level as well. If a hole lines up with it level, well you have a starting point, if not............well there is going to be more to it.
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Old January 8th, 2017, 12:49 PM   #9
 
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Ok I am seeing your response before I finished my explanation yes you are correct msp3903. I can see using the two piece weaver base's also no machining to do to the base's just drill two more holes in the receiver. Thats not a bad idea, I still have the receipt on the Leupold base I can take it back! I do have a good supply of Weaver style & Weaver brand scope rings already. Great idea now I have two solutions but I think that msp3903 hit the nail on the head!!!
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Old January 8th, 2017, 07:20 PM   #10
 
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Why not drill holes in the scope base to accommodate the holes already in the receiver?

Jeff
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Old January 8th, 2017, 08:04 PM   #11
 
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Well that was the general idea, but I think that I lucked out & found the scope base that I needed!!!
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Old January 8th, 2017, 08:09 PM   #12
 
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Quote:
Originally Posted by weaselfire View Post
Why not drill holes in the scope base to accommodate the holes already in the receiver?

Jeff
Not that easy on a Savage, as the receiver is rolling down out from under the base. The base HAS to have the right radius and HAS to be mounted in the right position to be parallel with barrel
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