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I have a fascination with the odd and esoteric wild cats but from a practical point it is best to keep it simple.
One case that I keep thinking about is the 7 x 65R case. By using this case and a 280AI reamer you would end up with a 7 x 65R AI a rimmed 280 Improved. The same thing could be done in 6.5 mm. By using two reamers or a custom neck/throat reamer you could avoid the cost of a full custom reamer. The rimmed case is only an advantage in break open doubles, singles and falling block single shots with less extraction power than the Ruger #1.
For the #1 you couldn't go wrong with the 6.5/06 Improved. The 6.5 long Krag improved would be a rimmed option but more involved case forming. The 6.5 x 284 might be trickier to get positive extraction but the reamers and dies are readily available, as are cases. The 6.5 Rem Mag is no slouch in a 26 inch barreled rifle, but it is almost obsolete itself.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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Joined: Apr 2004
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Campfire Kahuna
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Campfire Kahuna
Joined: Apr 2004
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Tejano has several valid points.
However.......
Given that the SAAMI 6.5x55 will push a 140 to 2800+ and the SAAMI 6.5x57 will push the same to near 3200, you should easily be able to break 3000 with a 140 in the Epps (6.5x56R Improved).
Reamers are available, as are dies.
Use a 7x57 neck size die on .303 British cases, then neck size to 6.5. Fireform, and your good.
Well, maybe a touch more involved than that, but not much.
In a #1, you should be able to get everything possible out of that case.
Sometimes practical is right...... And sometimes, it ain't.
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Joined: Feb 2001
Posts: 894
Campfire Regular
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Campfire Regular
Joined: Feb 2001
Posts: 894 |
Tejano has several valid points.
However.......
Given that the SAAMI 6.5x55 will push a 140 to 2800+ and the SAAMI 6.5x57 will push the same to near 3200, you should easily be able to break 3000 with a 140 in the Epps (6.5x56R Improved).
Reamers are available, as are dies.
Use a 7x57 neck size die on .303 British cases, then neck size to 6.5. Fireform, and your good.
Well, maybe a touch more involved than that, but not much.
In a #1, you should be able to get everything possible out of that case.
Sometimes practical is right...... And sometimes, it ain't. You may have miss typed or????? A 6.5x57 will push a 140 grain bullet how fast? 8mmwapiti
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Joined: Apr 2004
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Campfire Kahuna
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Campfire Kahuna
Joined: Apr 2004
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Oops, looked at the facing page, not the 140 page.
Retract that last post.
If a 140 at 3000 is the bogie, you'd best look squarely at the 6.5-06 and push it HARD, or go AI with the same.
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Joined: Apr 2004
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Campfire Kahuna
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Campfire Kahuna
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Still, a 140 at 2800ish, ain't gonna bounce off much.......
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Campfire Regular
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Campfire Regular
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To get the 140s to 3000 fps one need the capacity of the WSM, 264 Win Mag, 6.5 STW, the 6.5/348 improved would be a rimmed WSM, The 6.5x68 or the 375 Ruger case necked to 6.5. I am sure there are more cases that can get it done but those are the ones that come to mind right now. I have a 6.5-06 and it will push 129 and 130 grain bullets to 3000 but will not reach there with the 140s.
8mmwapiti
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Joined: Apr 2004
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Campfire Kahuna
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Campfire Kahuna
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He's running a #1 with a longer barrel. The 6.5-06 might get there in that set-up; the 6.5-06AI should.
Agreed that the 6.5-348AI would and would basically be a rimmed WSM.
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Campfire Tracker
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If you lump together all the .506 to .510 rim diameter cartridges there are a bunch. The .506-8 rim is the 45/70 or 45/90 case and the .510 the 348 case. There are a couple of metrics and the 280 Ross in this same rim diameter range.
So check out what has already been done or is available off the shelf before dropping the hammer on the project. A completely new wild cat will set you back at least $4-600 over an existing one with dies already available. I have never done it as I never get past the $$$ research point. I always settled for a more common chamber usually an AI but not a full blown wildcat.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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Joined: Dec 2007
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Campfire Tracker
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6.5X307 Improved, or 6.5 Super Bower should be in our sights also as you ponder.
How about a 260 Remington rimmed improved?
OR
A 6.5X57R improved (just keep them out of a break action gun)
Last edited by LouisB; 12/11/10.
Some spelling errors can be corrected by a vowel movement.
~ MOLON LABE ~
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Campfire Tracker
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I'd no doubt go 6.5-284 and add a couple more inches of barrel length. Had one of those once that I let get away. Stupid, Stupid, Stupid...
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Campfire Regular
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I dont think you could go wrong with any 6.5 cat. I dont thing I would do anything that had a rim oun the case. Ive been tossin around the 6.5 WSM or Pronghorn as I heard it called once. But then experience sets in and I say why not the 260 AI.
My 6.5X284 falls a little short of what I had intended, but its a great round. Ive never owned anything that had WSM attached to it, but I think the concept is sound. Ive got a 264 with a somewhat fast barrel, but for some reason I feel like I need a 6.5 in short action. OK, lets do the short mag.
Joseph
Joseph
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The 6.5-348 would basically be a rimmed 6.5SAUM or 6.5WSM.  That is what I am talking about... Actually, that would be pretty neat. I am still trying to figure out what I want to rebarrel my #1 with and for some reason I am stuck on a 6.5mm and rimmed cartridges seem to have a certain appeal. I don't know why but I half expected a 6.5mm-30WCF Ackley would have approached a little closer to the 3000fps mark with a 120 grainer. I must say that the 6.5mm-348 really has me very curious. If the capacity is similar to the .264 Win or a 6.5mm WSM, that is right where I would want it to effectively push some of the heavier bullets. As far as bullets, I would really like to utilize either the Swift 130gr Scirrico or the Nosler 140gr Accubond. Although, I doubt I would use anything much heaver than a 120gr if I went the 30WCF based case. I would definitely go Ackley either way just for the reduced cases stretch and trimming. The slight/possible velocity advantage is nice but not my main concern. We did the 6.5/30/30 AI, bad idea. A better idea would be the 6.5BR or just a 260 Rem AI. 30/30 cases are very weak to be running any pressures in...what a pain!
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Campfire Ranger
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Campfire Ranger
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In a 14" barrel my 6.5 GR (sharp shouldered thutty thutty necked down) would push a 120 gr 2400 fps. I'd guestimate at 22" tube should get that 120 going 2700 fps. Unfortunately the 30-30 case is thin and prone to case head sepperation.
Assuming this is a project for a single shot and hence the use of a rimmed case, I'd propose and interesting mild mannered 6.5 that would shoot tiny groups and have mild recoil. A 6.5br rimmed. Take .444 brass, trim to 1.5" and neck it down. Sure, a little bit of work, but odds are you'd have the only one around, and it should be wicked accurate. Looks like 120's at about 2800 fps, and 140's at 2500 fps.
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