Building a Black Rifle.

[gbal]

Thats a gamechanging calibre.

more 'namechanging'....unless it's a 6.6

[baldie]

Baldie will no doubt chip in if he spots this, but my understanding is that the Creedmoor has the boiler room to handle the 140 grain bullets, whilst maintaining an overall length that will still allow it to magazine feed from an AICS. Of course, the 6.5x47 will do the same, but many people say that it is better suited to the 123 grain bullets.

 

That was exactly the design brief for the Creedmoor Shuggy.

 

The two factory loads are 120 and 140 grain A-max. Both feed from a std AICS mag on the lands. This is the major design advantage this case has. It has the powder capacity to shove the 140 fast enough too, unlike the 47. It also has the same shoulder angle, so the powder burns inside the neck and not the barrel throat, and it has a long neck, which all the "accurate" cartridges do.

 

Norma are now making brass for it. There is absolutely nothing wrong with Hornady brass....it looks identical to nosler custom to me.

 

Its also easily formed from various other cartridges.

[gbal]

Dave,all agreed-the 260rem still has just an edge on capacity,and the basic case is well proven-and works well in 'precision-tactical' magazines where nothing finicky is tolerable.Good stalking cartridge too (commercial ammo off (some) shelves,inc 140g deer loads.)

Much of the improved design featurs in the Creedmore were 'aimed at' the competition shooter who reloaded,and these may well add up to such an advantage-maybe even a bit more barrel life,but not if run hotter,of course.Availability should improve.

The basic reviews seem to hold: 260 for tactical/stalking,factory rifle choice; Creedmore for the target competitor/absolute precision in this group; 6.5 x47 flavour of last month,rightly so,and a fine all rounder. Rifle and ammo/component availability do come in,and do differ and likely will continue to do so-there won't be enough Rugers for everyone (which may not be too disappointing,in the end.) They do heavily overlap of course,despite the niches, with appropriate rifles. Spoilt for choice,and there are the oldies too.

Gbal

[Cumbrian 1]

 

The two factory loads are 120 and 140 grain A-max. Both feed from a std AICS mag on the lands. This is the major design advantage this case has. It has the powder capacity to shove the 140 fast enough too, unlike the 47. It also has the same shoulder angle, so the powder burns inside the neck and not the barrel throat, and it has a long neck, which all the "accurate" cartridges do.

 

 

Hi Dave,

 

What velocity would you expect from the creedmoor and the 140 amax combo say in a 26" barrel?

[gbal]

SAAMI specs performance of commercial loads for the 260rem :

 

Fed 140 SMK 2700fps

Rem 140 core lock 2750

Nosler 140 part 2800

 

These are 24" barrel,but allowing for that,and the slightly less capacity of Creedmore,give an indication of non hotted performance. ( three 120 g loads -Rem,Corbon,Fed come in at 2890,2900,2950fps respectively for comparison).

gbal

[Cumbrian 1]

SAAMI specs performance of commercial loads for the 260rem :

 

Fed 140 SMK 2700fps

Rem 140 core lock 2750

Nosler 140 part 2800

 

These are 24" barrel,but allowing for that,and the slightly less capacity of Creedmore,give an indication of non hotted performance. ( three 120 g loads -Rem,Corbon,Fed come in at 2890,2900,2950fps respectively for comparison).

gbal

 

Interesting, my 6.5x47 pushes the 140 amax at 2809fps (that is the trued velocity for my ballistics) I would have thought the larger capacity of the creedmoor would of pushed them more towards 2,900fps+ but I suppose someone who is handloading will be able to get better performance out of the round.

[gbal]

Cumbrian,agreed- these are validated commercial loadings from a 24 inch barrel,at SAAMI pressures.

NO doubt handloaders often push up pressures,hence velocities...SAAMI though gives 'apples to apples' or as near as we can get,if no SAAMI loadings available.Then it's "xfps' ..'and no pressure signs' whatever that means.

Velocities too have to be true valid chrono ones-not adjusted from drop data-important though that is for the particular shooter.(the drop data may well reflect small input imperfections-scope hight etc etc and measurement errors-small but contributary).

 

OK-that said,there won't be a lot in it.260 has the largest capacity. Case design is a factor though,in 'efficiency',but won't be a big factor between these three. The 'mythical?' 260 nosler will be different,even from the 264 win,and sell equally not well-except it doesn't always work out like that! :-)

g