Long Range Flat shooter??????

Curt · #8 02-02-2006, 09:18 PM

Thanks guys for all the great advice, but now I have more questions. I've done a search for the 280 AI and turned up some information, but the search is bringing up alot of other stuff too. Anyway it sounds like I should stay with the 280AI since I don't want to rechamber the original barrel. I am leaning towards a Pacnor barrel in the Remington varmint contour and 26" long, I think I need a 1-10 twist for shooting up to 150-160g bullets. Mostly I think I will be shooting 130-140g bullets. Pacnor offers alot of different barrels from 3,5,6 groove and they offer a polygonal rifleing also. What would be the advantage to one of these goove barrels over the polygonal rifleing or visa vesa. Also fluted or no fluted barrel.

As far as the reverse conversion goes, you never know what may come down the road and if the pre 64 is worth more in its original state than I can always "restore" it to that state if I keep the old barrel and stock. Again guys thats for the info and keep it coming!

ILIKA308 · #9 02-03-2006, 07:03 PM

I HAVE A 280AI WITH A SCHNEIDER BARREL ON IT. MR SCHNEIDER BUILDS SOME OF THE BEST 7MM BARRELS ON THIS PLANET. 1 IN 10 OR 1 IN 9 WILL DO WHAT YOU NEED TO DO. JUST MY OPINION.

Bart B · #10 02-04-2006, 11:16 AM

The most accurate barrels I know of have 4 or 5 conventional grooves.

And none of 'em are fluted. Fluting a barrel changes its bore/groove diameters; moreso at the ends of the flutes than between the ends. A fluted barrel is less stiff than one of the same diameters and countours than a solid one because metal's been removed from its outside. A fluted barrel of the same weight and basic contour of a solid one is typically less than 5% stiffer; not enough to be critical.

And fluted barrels don't cool as fast as a coarse sand blasted one. If any barrel is properly stress relieved after rifling it won't bend when it gets hot.

If one must have a fluted barrel, I think it's best to have the unrifled blank fluted before it's rifled, then cut rifle the bore, then stress relieved and lapped to uniform bore and groove diameters. Krieger and Obermeyer do this better than anyone else.

Northman · #11 02-04-2006, 11:48 AM

If you are going to shoot mainly in 130-140 grain, I would go 6,5. The new sirrico II 130 grains has a BC of .571..

Maybe a 6,5-06. Only gives 200 fps more than a 260

The 7mm is nice from 140-150 in a 7-08 with hunting bullets in .5++ BC. If you want a higer bullet weight, you need to step up to 280. I would go for a 280AI just for the fun of it. You only get 100-200 fps more with a 24"-26" barrel. But thats almost equal of the 7mm Rem Mag with 10 grains less powder.

But, since you have along action, the 6,5-06 or 280AI, seems to give the best compromise. Where I live, the minimum weight of a bullet is 140 grain, so my pick would be a 280AI.

uncleB · #12 02-04-2006, 07:54 PM

[ QUOTE ]
The most accurate barrels I know of have 4 or 5 conventional grooves.

And none of 'em are fluted. Fluting a barrel changes its bore/groove diameters; moreso at the ends of the flutes than between the ends. A fluted barrel is less stiff than one of the same diameters and countours than a solid one because metal's been removed from its outside. A fluted barrel of the same weight and basic contour of a solid one is typically less than 5% stiffer; not enough to be critical.

And fluted barrels don't cool as fast as a coarse sand blasted one. If any barrel is properly stress relieved after rifling it won't bend when it gets hot.

If one must have a fluted barrel, I think it's best to have the unrifled blank fluted before it's rifled, then cut rifle the bore, then stress relieved and lapped to uniform bore and groove diameters. Krieger and Obermeyer do this better than anyone else.

[/ QUOTE ]I think I could dis agree with almost everything you posted but to keep Len's Living room happy I'll leave it at that.
UB

royinidaho · #13 02-04-2006, 08:09 PM

Yep...

Desert Fox · #14 02-04-2006, 10:50 PM

If I were you, my choice would be the 280 AI. You'll have better selection on bullets. For long range, Nosler Ballistic Tip 140 or 150 grain are hard to beat. My first long range rig was a rebarreled 1909 Argentine Mauser chambered for 280 Remington. The 24" Douglas in No.4 contour is very accurate. If you preferred Pac-Nor, I suggest get their Super-Match. I have a 25"-3 grove Pac-Nor 1 in 12 twist on my 308 and it's an excellent barrel. [img]/ubbthreads/images/graemlins/wink.gif[/img]