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new 6mm?

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Unread 12-26-2013, 01:03 PM
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Join Date: Feb 2008
Location: Goshen, IN
Posts: 846
new 6mm?

I'm looking for a new barrel for my encore and was wondering what cartridge would be best in a 26" barrel? Wanting a hot rod but don't want to be blowing un burnt powder out the end of the barrel. I plan on using for varmints and antelope out to 500 yards. Was thinking of the 6x47 lapua, 243AI, 240 weatherby or the 6x284. Heaviest bullet I was planning on shooting is 95 grain.
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Unread 12-26-2013, 03:02 PM
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Join Date: Feb 2012
Posts: 987
Re: new 6mm?

probably the best bet if you want more horse power then a 6mm rem would be to have a gun chambered in 6mm06. Its basicaly the same round as the 240 wby but no belt and cheap easy to find brass.
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Unread 12-26-2013, 03:57 PM
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Join Date: Apr 2007
Location: Fort Morgan, Colorado
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Re: new 6mm?

Any cartridge with a case larger than a 6mmRem is over-bore including a 6mm-06. If you have no issues with replacing the barrel after a rather limited number of rounds through it then the 6-284 or the 6-06 ought to do what you want. I will offer some non-solicited advise and you can reject it if you want, heavier for caliber bullets will actually hold their velocity better at longer ranges and will help reduce some of the throat erosion. If you can find a barrel with a 1/8" rate of twist you could easily stabilize 105 grain bullets and you might be able to do this with a 1/10" ROT since you are planning on using a 26" tube.
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Unread 12-26-2013, 04:01 PM
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Join Date: Oct 2011
Location: Western Pa.
Posts: 253
Re: new 6mm?

Looking at your 500yd range use and 26" barrel I would look into the 6BR. Easiest round in the world to load for...Lapua factory brass avail. and real easy on barrels.
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Unread 12-26-2013, 07:23 PM
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Join Date: Mar 2006
Posts: 899
Re: new 6mm?

I really like the 6-284! It is an awesome round. Check out the previous posts on it!
I'm sure the 6-06 will perform well also!
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Unread 12-27-2013, 12:13 AM
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Join Date: Jun 2010
Location: greenwood, IN
Posts: 4,057
Re: new 6mm?

The 6mm Remington is indeed about all the powder the 24 bore will burn contrary to popular belief. It doesn't matter whether you go a 30" barrel a 24" barrel, the results end up being very close to each other. The .240 Weatherby case is smaller in volume than the 30-06 case used in the 6mm-06, and yet with it's higher chamber pressure shows maybe 100fps faster velocity than the generic 6mm with the help a lot of free bore. Add that same free bore into a max load from the 6mm, and you'll see similar velocity.

The 6mm-06 has a very slight more case volume than the 6mm/284, and that round is famous for making barrel manufacturers rich. I shoot the .250 Savage case necked down to 6mm and improved. It will do 3000 fps with a little over 44 grains of H1000 and a 105 grain Amax. That's close to 150fps less than the 6mm with the same bullet, but also using about five grains less powder. But on the otherhand the better case design in the 6mm will probably give you a 50% increase in barrel life. Yet the 6mm improved case will give even better barrel life yet will be slightly overbore (not enough to be alarmed about). The .243 case is well known as a poor design, and is rather hard on barrels. Ackley did an improved version, and maybe increased the throat life 33%. Yet still way short of a standard 6mm Remington. Then we get into the 6BR that somebody mentioned here. That barrel will last 50% longer than the best of the rest with ease! It'll push that 105 grain bullet to 2800fps and some folks are getting 2900 fps; yet uses about 2/3rds the powder.

Of course if your one of the guys that only shoots a hundred fifty rounds a year, then any of these rounds will do you just fine. The only serious difference is the cost of powder, and that still is not much. But if your thinking about a barrel life of 1500 / 2200 rounds, then you better look for a non over bore cartridge
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Unread 12-27-2013, 01:45 AM
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Join Date: Jan 2011
Location: Spokane, WA
Posts: 3,941
Re: new 6mm?

The only thing wrong with the 6mm Remington is the current brass situation.

A lot of good choices listed, and my 2 cents is pick the one with quality brass, in good quantities readily available.
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