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  #1  
Old 10-05-2009, 06:58 AM
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Scope mount for 03A3


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Gentlemen,

Forgive me if this has been discussed before, but I did a search of the forum and came up empty.

I have a late-40's production Springfield 03A3. I have completed a rather nice sporterized stock for it and would now like to complete the gun with a scope mount. Do any of you have experience with the S&K "Instamount" which requires no drilling or tapping? I would really like to avoid making serious changes to this gun, in case I ever want to revert to the military look and feel.

Also, if any of you have shot this particular model gun, can you tell me if there is any need to avoid working up to the hotter loads for the '06? In other words, is this action a limiting factor, in any way?

Jason
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Old 10-05-2009, 01:49 PM
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Good choice

I have used S&K InstaMounts on several military rifles and they worked just fine. Your 1903A3 should be safe for published loads as listed in various reloading manuals and follow the recommendations for working up loads. All the best...
Gil
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Old 10-05-2009, 02:23 PM
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Quote:
Originally Posted by broom_jm View Post
Also, if any of you have shot this particular model gun, can you tell me if there is any need to avoid working up to the hotter loads for the '06? In other words, is this action a limiting factor, in any way?
I agree with Gill as far as factory loads or published reloads go, but as much as I love the '03 I must admit it is far from the strongest action available. The cone breech common to the '03 and the pre-'64 Winchester Model 70 facilitates loading but leaves part of the case head unsupported.

Just don't try to make a .300 Magnum out of it and it should be fine.

Good shooting,

The Old Guy
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Old 10-05-2009, 02:50 PM
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Had the Insta-Mount on a couple of 'a3's. If you have a different stock, you will be fine. The front band that circles the receiver just behind the recoil lug will require bedding in the stock.

Never had a problem with hotter than the then factory loadings and always felt confident with the three locking lugs.
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Old 10-06-2009, 04:41 AM
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Mr. Guffey,

I think the process you are referring to may be the double-heat treating process? If so, it actually only replaced the faulty visual heat treating system used with the old ordnance steel in Springfield Armory receivers between about SN 800,000 and about 1,200,000 million or so (with a few exceptions later due to some reintroduction of old stock) and at Rock Island Arsenal only briefly before they went to Nickel steel, if they didn't do it directly? I don't recall that detail. But I believe Springfield found the double-heat treating too labor intensive, and replaced it with nickel steel.

There is a write-up of the receiver failure history, here, but Hatcher is the source, since he was involved in the investigation.
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Old 10-06-2009, 07:09 AM
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Don't butcher up that fine old Springfield !!! I saw a Springfield 03 about a year or so ago that was milled for the pederson device and it had been heavily sporterized. I almost threw up right then and there. I tried to buy it, but it was somebody's long, lost, uncle's gun or something. Oh well, I tried !!! HD1
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Old 10-06-2009, 07:18 AM
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Fguffy - I'm well aware the 3rd lug on the 'a3's doesn't make solid contaact with the receiver upon closing, but as you say - it's there for safety. My bad for saying "locking" lugs.
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Old 10-06-2009, 07:20 AM
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I am hoping to keep the gun as clean and original as possible, but I'm interested in shooting it, not looking at it. The S&K mount will allow me to put the rear sight back on, should I ever choose to do so, but I'm tempted to get rid of the front blade altogether. It is currently not on the barrel, which leaves a large band of exposed metal where it is supposed to be installed. I am considering having that cut off, or a muzzle-brake installed, but will probably take the least expensive option and just have the front band/blade put back on. This will result in a slightly compromised view from the scope, but it has the least impact on the gun and that is why I'm looking into the S&K Insta-mount.

I'll be sure to use starting to medium loads until I'm confident their are no signs of pressure.
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Old 10-06-2009, 07:51 AM
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Mr. Guffey,

I'm well aware of the externally visible physical differences between '03 and 03A3, but was not aware the receiver steel specification had undergone yet another steel and/or process change since the '03 problems had originally been solved. Especially since Remington borrowed all the Rock Island Arsenal machinery for production when the British first ordered them. I do recall the 03A3's put together in the 1960's that are marked "National Ordnance" used new investment cast receivers.

I have also heard the heat treatment is different between the Remington and Smith Corona receivers from the WWII production, but have no first-hand knowledge of it. I've never had an SC 03A3. Perhaps you can verify or correct that heat treatment difference?
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Last edited by unclenick; 10-06-2009 at 07:54 AM.
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Old 10-07-2009, 06:21 AM
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I am mostly just interested in the S&K Instamounts, but the history lesson is somewhat fascinating. Mine is a Smith-Corona model...are there any quality issues I should be concerned about?
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  #11  
Old 10-07-2009, 09:13 AM
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Original question involved scope mount.

get the redfield one piece and you will like it.
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  #12  
Old 10-07-2009, 09:27 AM
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The S&K Insta-Mount will fit your SC just fine. That was the type I first mounted the S&K on. Again, you need to relieve the replacement stock in the front receiver area to allow for the encircling band. Other than that, not much to it. The scope will sit pretty high when mounted - hope the new stock has a good Monte Carlo rise to it.
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  #13  
Old 10-07-2009, 10:44 AM
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The after-market stock has a substantial (huge?!) monte carlo rise so hopefully I'll be able to get my cheek into the gun when shooting.

Langenc - Does the Redfield one-piece base require any drilling and tapping? That is something I want to avoid, at all costs.
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