Grendel at extended ranges?

[txgunner00]

Let's compare case dimensions and bore capacity:

6.5 Creedmoor: Shoulder 30 deg; Neck Length 0.2852 in.; Case Volume 52.4 gr H2O; Bore Capacity 1.6
260 Remington: Shoulder 20 deg; Neck Length 0..2595 in.; Case Volume 54.8 gr H2O; Bore Capacity 1.7

The term "Bore Capacity" is defined at the end of the thread at http://www.gunandgame.com/forums/general...ion-2.html. The barrel is defined to be at bore capacity when the case volume gives one grain of powder per square millimeter of throat area. The note indicates that doubling the bore capacity reduces observed barrel life to about 1/4 of that of the .308 Win & .223 Rem cartridges. Nothing was said about neck length and shoulder angle.

Using this relationship suggests that the 6.5 Creedmore might see 10% more barrel life than the .260 Remington. Using the 3000 rounds generally seen by precision shooters of the .308 and .223, we could expect a difference in barrel life of about 150 rounds out of a total of about 1700 for the two.

Is this enough to make up for the difference in component costs?

Sounds like an SAT question is in there somewhere...

What would the assumptions be for average brass life? There wouldn't be much if any difference in cost for the rest of the components.

Midway prices mostly

6.5 Creedmore brass-

$32/50 for Hornady,
[SIZE="1"]$110/100 for Lapua[/SIZE]. scratch that- wasn't supposed to be here

260 Rem. brass-

$53/100 for Rem,
$50/50 for Nosler
$110/100 for Lapua
$107/100 for Norma

Once fired .308 brass- ???