The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Rifles Single Shot Rifles Ruger No 1 in 500 A SquareGo | New | Find | Notify | Tools | Reply | |
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I just dropped a barrel and action off, to have put together in 500 A2. The donor action is from a 7mm Rem Mag. What changes to the action do you think I will need to make to make this function. extractor? and if so what one do you recommend. Also he 7mm Rem Mag barrel, tropical sights and rib will be up for sale when I get it back. The bore is in great shape. | ||
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Several years ago I had one rebarreled to 50-140. I was able to get A2 ballistics with a rimmed cartridge. Although this has been about 30 years ago, I believe the smith used the extractor that came with the gun. The donor was a 375 H&H. He might have reshaped it a bit, but I know he did use the original and it worked fine. Keep us posted when you get it back. All ways regretted selling that gun. | |||
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thanks Congo. The 7 mag would have the same size head as the 375 so maybe I will get lucky. Shane | |||
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Hang on to your teeth...that A square will rattle everyone of them. DRSS Member | |||
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I am not sure what all of the above means.....except it might hurt a little! Waiting to here back from the guy mounting and chambering the barrel. From what I have found out it appears I will need to use the ejector from a Ruger No 1 in 416 Rigby, unmodfied. thanks to all Shane | |||
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Just to compare will known cartridges with a reputation for recoil. The first one is a 300 Weatherby Mag with a 220 grain bullet at 2800 fps and producing 3900 ft-lbs. The second one is a 375 H&H Mag with a 300 grain bullet at 2500 fps and producing 4250 ft-lbs. The 500 A-Square is an animal.   | |||
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my old ground squirrel gun was a 10 lb 378 Weatherby that was shooting 300 grain bullets at just shy of 3000fps. Now that was a kicker! | |||
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That will work.  What barrel length, contour, twist are you liking? What sights or scope mount? My 500 A-Square Ruger No. 1 is a re-barreled .416 Rigby, done about 1999 along with the BRNO ZKK 602 of same chambering:  Without muzzle brakes, the Ruger is 27" and the BRNO is 23". Same overall length. With muzzle brakes, the Ruger is 29" and the BRNO is 25". About the same weights too, bare. About 10.5 lbs IIRC. The Ruger No. 1 requires a heavier barrel to make that weight: A 6" cylinder knoxform then straight taper to 1.000" muzzle diameter. AMMO adventures:  The ACCURACY of a mild load in the McGowen stainless 1:10" TWIST:  I used to call the 500A2 my .510 JAB, as Art Alphin was a bit obnoxious to me at Shot Show.  The Ruger No. 1, was my first, just chambered with a 500 A2 reamer and throated a little longer. Standard 500A2 throat is plenty long, I now know. Only if you want to load the Hornady A-Max as long as possible do you need any extra throat. The bugholer bullet on above target is the Harlow AAA 705-grainer on far left in pic below, the GSC next to it is just as good, and now available Made in USA, on the Michigan-Indiana border.  | |||
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The barrel and action are at the gunsmith right now so I can not measure it. However, as best I can recall; the barrel is 21 1/2 without brake and another 2 1/2" with the brake. The barrel started out as a round blank and now it a tapered octagon and about .850 accros the flats at the end. It has a detachable machined quarter rib on it but I have not yet decided how to mount a scope on it; I need the quarter rib back so I can measured what size of slots I can have machined in it so that I can clamp the rings on. I know it is not wide enough to use a Weaver style slot. Should have it back soon and then I will post some pics. | |||
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Ah-so! You are doing a "sporter" instead of a "tactical" Ruger No. 1. Your tapered octagon is 0.850" on the flats at the muzzle, 21.5" sans muzzle brake ... about a 10-pounder or lighter? Twist? My BRNO .510 JAB got a barrel transplant to .500/.338 Lapua Magnum Improved. The take-off barrel is 23" sans brake. I could have an inch cut off the shank and re-thread for Ruger No. 1, remove the secondary barrel recoil lug, and have a sportie one too, iron sights only, express. That round barrel is about .870" diameter at the 23" mark. So it would be similar in mass to yours, and that is appealing. 500 Nitro Express ballistics will be a light load for you. | |||
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The bsrrelis a 1/20 Kreiger that started out as a 510KX on a enfield. I am having the threads cut off and then re chanmberd to the A Square and threaded for the Ruger. I am guessing around 10 lbs depoending on the wood. I will be picking up a semi inlet from Christrees as soon as I pick the blank; I can add or loose some weight there. I also have a couple of mercury recoil tubes. I could add one if necessary. The donor action was a 7 Mag with iron sights if you know anyone that might be looking for a good barrel/sights and rib. | |||
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can you give us some load data on 50 bmg bullets in our 500 a2? | |||
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You talkin' to me? You can get about 80% of a 50 BMG out of a rifle weighing 1/3 as much, using a 500A2 or the 50 Peacekeeper copycat. It's been 10 years since I experimented with 50 BMG bullets in the 500A2. I don't have the records here, unless I did a search on the Big Bores forum. IMR-4350 or H4350-Extreme: Start with 100 grains of powder. Use any bullet from 600 to 750 grains. Work up. I stopped at 750-grainer at 2250 fps in a 27" barrel, 1:10" twist. Chopping the barrel off by 4" will cost you 100 fps, in going from 27" to 23". One moderate load with IMR-4350 is shown in the target picture above. Now, I would use H4350-Extreme rather than IMR-4350, for temperature stability, and seemingly less lot-to-lot variation lately, using same charge weights. RL-15 or Varget-Extreme with 570-grainers: Start with 100 grains of powder and work up. Benchmark-Extreme with 450-grainers: Start with 100 grains of powder and work up. | |||
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The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Rifles Single Shot Rifles Ruger No 1 in 500 A Square
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