Originally Posted by liltank
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)