Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels and Ballistics


Reply

what 6mm

 
LinkBack Thread Tools Display Modes
  #22  
Old 03-25-2013, 10:28 AM
Platinum Member
 
Join Date: Jun 2010
Location: greenwood, IN
Posts: 3,604
Re: what 6mm

Quote:
Originally Posted by liltank View Post
See, that is what I'm trying to decide. I wanted to go 6BR. But then I got to thinking the Dasher would give me the same accuracy potential as the BR with a little more horsepower. I am thinking of using the 105 Berger Hunting or the 105 A-max. I am mainly going to use this for a high volume of fire rifle for varminting and try my hand at F-open. I want something that will get me to 1000 with good accuracy, but not burn the barrel out in the first season of usage. That is where I figured the Dasher and highly considering the straight 6-250 Rem. I figured neither are really that overbore and should sustain a barrel life of 5-7000rnds. Am I on the right track? What kind of barrel life would I expect from the BG? I am also considering the possibilities of using the 115's.
punching paper wether formal or informal is a form of target shooting. Big cases just don't do as well as some of the smaller ones. But the ideal prize is a case that's sized right and yet has the needed umph to take you to the yardage your shooting at. A thousand yards is pretty much the limit for a 6mm bullet, and honestly the 6.5 will do you a better job. (or a 7mm) The 6/250 is a nice little round, but it looks like the throat's gone at around the 1200 to 1400 shot mark. The improved version is slightly better, but nearly as much as must of us shooters would have hoped it'd be. The Ackley version is pretty good, but would be much better reamed with a 6mm Ackley reamer instead of the 6/250AI reamer. They have the same shoulder diameters and the same taper per inch, but the 6mm Ackley has a much better neck length. Unlike the .243AI or the 6/250AI. You ream it with the 6mm Remington improved reamer, and headspace it off a .250AI gauge. The 6BG works exactly the sameway, but uses a .300 Savage headspace gauge. That round fits nicely between the Dasher and the 6/250 improved, but with a .35" neck length. The 6SLR is really nothing much but a 6mm HLS improved that has another .010" added to the shoulder. That round has been done several other times with a 1.56" shoulder and a slightly different neck length, and also with the 40 degree shoulder as well. Great round by the way! The 6mm SLR necked upto 6.5 would be an even better round in my book

Right now there seems to be an interesting resurgence into the 6.5x57 improved case design. There are several out there with only minor differences. One uses plain jane necked up .257 Roberts cases with a 30 degree shoulder and the standard Ackley tapers (Kiff has the reamer prints on file). But others prefered the 40 degree ackley version. This seems to be a serious 1000 yard round that fits nicely between the .260 Remington and the 6.5-06. Dies are easy to come by as all you need is a .257 Ackley bushing die and you open up the seater to fit the 6.5 neck diameter. Recoil will be somewhat stiffer than the smaller 6mm cases, but you get .55 and up B/C's, verses .50 for a 105 Amax (the 107 Sierra being slightly higher)
gary
Reply With Quote
  #23  
Old 03-25-2013, 10:35 AM
Platinum Member
 
Join Date: Jun 2010
Location: greenwood, IN
Posts: 3,604
Re: what 6mm

Quote:
Originally Posted by blipelt View Post
The fact is barrel life and caliber depends on what you plan to do. Hunting rifle doesn't really matter what you use.

Calibers are regional and bias. Fact is I am favorable to a 6Dasher since one of the best benchshooters in the country lives here and was the first to use one. Information and help is easy to get. I know the history of the caliber, characteristics, and all the National Titles this little caliber has won since 2003.

Brent
a lot of guys are using the Dasher, and a lot of guys are having problems with the Dasher as well. Fire forming cases seems to be a problem with a lot of folks. Some guys are seeing a lot of neck splits too. The 6BG would flat smoke a Dasher seven days a week with less trouble forming cases. But on the otherhand the Dasher starts out using better brass, but as I said before creates other issues. If you used Lapua .243 brass to form the cases I see no advantage but a longer barrel life.
gary
Reply With Quote
  #24  
Old 03-25-2013, 11:17 AM
Silver Member
 
Join Date: Nov 2012
Location: Green River, Wyoming
Posts: 389
Re: what 6mm

I've got a 6x47 and a 6AI but I would really recommend the 6x47.

I'm using a 30" Lilja so 39 gr H4350 will make 95 gr Match Kings go 3100 fps (as good or better than many standard 243 Winchesters, to my knowledge).

As long as it's built right it's a super accurate and efficient round. (see attached picture)

As for deer and antelope it will do that too. I've killed antelope from 450 to 825 yds with it (at 800+ it's running out of energy so ya gotta hit 'em good ).

And it's extremely pleasant to shoot.

Best of Luck,
Attached Thumbnails - Click to View Larger
what 6mm-6x47edit2.jpg  
__________________


-The flexibility of your adaptability is the true measure of your intelligence-
Reply With Quote
  #25  
Old 03-25-2013, 11:54 AM
Gold Member
 
Join Date: May 2012
Location: Ohio
Posts: 560
Re: what 6mm

All good info here..I myself love the little plain ol 6br. Any perceived shortcomings IMO can be overcome with nothing but a bit more practice, and thats something that the 6br can give you at an affordable level. I know some guys that I shoot with use the 6x47 for our 1000 yds matches and they definitely have more horsepower than my br does however they all seem to have more issues @ 850+ yds with vertical than I do. Just something to think about. Having said that if I ever build another 6 it will be a 6x47 hands down. Great brass, still good barrel life, great bullets & relatively low recoil to get you to 1000 yds .
Reply With Quote
  #26  
Old 03-25-2013, 06:53 PM
Platinum Member
 
Join Date: Jun 2010
Location: greenwood, IN
Posts: 3,604
Re: what 6mm

I made an error in my post, and got to thinking about it awhile ago. The data in the Hornaday manual for the .300 Savage is incorrect! It should have a 1.55" shoulder length, and the 6BG has an over all length of 2.040" max. There was actually two different 6BG's. The first one has the same taper perinch as the .300 Savage, and the second one has the same taper as the .243 and 6BR per inch. Personally I'd rather have the .010" taper per inch that Ackley used, but with the 30 degree shoulder. All Bob did was to simply fix the short commings of the .243 Winchester, and yet still use their brass.
gary
Reply With Quote
  #27  
Old 03-25-2013, 08:54 PM
Platinum Member
 
Join Date: Apr 2008
Location: Central ND
Posts: 1,021
Re: what 6mm

Gary I can't say I had any problems with the 600 brass I fireformed last year. I split 4! But then again like I posted before help is close and experience well no one else compares. I look forward to seeing the 6 BG in Calf. next month at the benchrest and F-Bench Nationals. I am sure if it is good as you say some will be shooting it. Guess we will see what comes out on top.



Brent
__________________
"Amazing things can happen when preparation meet opportunity" Richard Schatz


"The will to win, compares little with the will to prepare to win" Donovan Moran
Reply With Quote
  #28  
Old 03-25-2013, 11:03 PM
Silver Member
 
Join Date: Jul 2008
Location: Base of the Bluemountains aka Gods Country
Posts: 466
Re: what 6mm

hey cb what about the 6-47 do you like better over the 6AI ?
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes



All times are GMT -5. The time now is 08:58 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC