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Old 05-30-2013, 06:53 AM   #11
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If you wanted to do something different you could always do a 6.5 WSM or neck down a 330 Dakota case to 270 or 7mm. Those are the two best modern cases IMHO. Pretty much everything that can be done to a 30-06 or 308 case has already been done a thousand times before.
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Old 05-30-2013, 02:41 PM   #12
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First things first you can only push so much through a set diameter hole.

Once you get to overboar cartridges that gain is negated by the extra amount of powder you need to burn.

That 270-338 LM is going to be running some serious pressures and you need a 32"+ to harness all the power in the slow burning powders you are going to need to use in it. I am going to say you are going to get 300 to 500 rounds down the barrel before you have eroded the throat so much that you need a new barrel.
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Old 05-30-2013, 06:03 PM   #13
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JMO...and probably shouldn't respond,oh well.

Work on the basics.....as posted above,tooling costs are at issue.If you have access to a machineshop why not just start with a simple rebarrel?Stick with a std calibre and work on all the details involved....before adding the complexity's of a new chambering.Pick a calibre that has a proven track record....buy a reamer.Which is no small matter(so many good choices).IOWs,get your ducks in a row twds building rifles before worrying about wildcats?Good luck,in any event.
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Old 05-30-2013, 06:48 PM   #14
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Thanks for all the help I realize now that it is more complex than I had originally thought and much more research would be needed before attempting to design and fabricate a new cartridge.
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Old 05-30-2013, 07:00 PM   #15
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Yeah there is noting easy about it if you are trying to strike a good balance, and you will find that in the vast majority of cases the ideal balance already exits in a commercial cartridge (except for maybe the .358 caliber) You can put a twist here or make a short action there, but pretty much all the bases have been covered before.
Some common wildcats are REALLY good, one that comes to mind in the 6.5-06 it can duplicate the performance of the 6.5mm magnums and brass can easily be formed from any 25-06 you have laying around. A few of the AI wildcats are popular as well, the 280 AI is so popular that Nosler makes brass for it despite the fact that is never has been a standardized cartridge, same can be said for the 6.5-284 1,000 yard benchrest shooters put that wildcat on the map and it is not going away anytime soon now that you can buy ammo and brass for it, but it is not longer a "wildcat" I think Norma got it standardized.

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Old 05-30-2013, 07:11 PM   #16
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Most wildcatting nowadays revolves around 6mm, 6.5mm, 7mm and .338 calibers, they are in general capable of higher ballistic co-efficiencies then the in between calibers, before you 30 cal crowd has me lynched no I did not forget about you, the 30 calibers also are capable of radically high BC but more times then not they are the parent case hence not a wildcat (308, 30-06, 300 WSM, 300 Win Mag, and now even the 30 T/C)
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Old 05-30-2013, 08:39 PM   #17
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FWIW, your cartridge has already been done in the form of the 7mm Remington Mag., and the 7mm STW (which is actually the 8mm Rem. Mag. necked down to 7mm). Though not .277, but actually .284, they are very close. I suppose that either one of those could be necked to .270 and your proposed cartridge and rifle could be made if you wanted to go to the expense.
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Old 05-30-2013, 08:58 PM   #18
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I know it is a bit less common but I would opt for the 330 Dakota parent case over the 8mm RM anyday. 30 degree shoulder, about 85gr case capacity (about the same as the 8mm), long neck, beltless magnum, it would run neck and neck with the 7mm Ultra Mag for speed/trajectory and unlike the 8mm RM and ultra mag it will fit in a standard 30-06 length action. If I were trying to make the ultimate 270 that is how I would do it.

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