Sub 16in barrel: 7.62mm or 6.5mm

[call_me_ski]

In another thread it seemed that some would prefer a 6.5creed or a .260rem in a 13.5-14.5in barrel than a 7.62nato. I was surprised by this and it goes against other opinions I have heard.

What does everyone think about this?

[Firefly]

You can if you really want to.

Like I guess if you are messing with vehicles or want a huge suppressor but for regular fart around use....why?

[ALCOAR]

http://https://rifleshooter.com/2016/02/6-5-creedmoor-effect-of-barrel-length-on-velocity-cutting-up-a-creedmoor/

My real question I would have if it were for serious use is what effect it has on the terminal ballistics of 6.5cm. The above article gives you enough info to form your own conclusions in terms of Dope differences b/t barrel lengths. It however says nothing of barrels shorter than 16".

[corey4]

The link doesn't work

[CoryCop25]

It’s my understanding that with a shorter barrel, the heavier weight bullets get a little wonky. So the Creedmore’s bullet weight may be the key to this issue.

[markm]

Sub 16 makes ZERO sense for either round. You're robbing the cartridges of too much burn time.

[ALCOAR]

The link doesn't work

Weird, sorry about that. Here is the same article, and the link works for me when I preview it....

https://rifleshooter.com/2016/02/6-5-creedmoor-effect-of-barrel-length-on-velocity-cutting-up-a-creedmoor/

[dpete]

You might want to consider the other 6.5 out there. 6.5 Grendel. Not as fast as a C'moor but short barrels are easy to find, the shorter cartridges use faster powders, and the smaller frame rifle is great for treestand hunting. 123-129 grain bullets out of a 12.5" barrel will hit 2200 fps easily and Nosler 129 gr. ABLR expand down to 1300 fps.

[MegademiC]

Sub 16 makes ZERO sense for either round. You're robbing the cartridges of too much burn time.

This. 300blk throws 110gr projectiles to over 2200fps
6.8spc 115gr 2400fps per google. If Im paying the money and weight for 308/6.5cm, its gonna be at leat 16”, brobably 20”
,

[FlyingHunter]

Sub 16 makes ZERO sense for either round. You're robbing the cartridges of too much burn time.

Truth. OP - study the ballistics and you will find that markm is right on the money.

[Vegasshooter]

In talking with guys in the industry that I know and trust very much, they are getting better performance out of their 16” 6.5CM than they do with 18”+ .308’s.
Better ballistics, better energy on target, and softer to shoot. My only 6.5CM gasser is my GAP-10 (for now), and it is a 22” Bartlein. Nor exactly a fair comparison. It will STOMP any .308 out past 1200yds.
I am VERY much looking at going to a 16” 6.5CM and shooting the 120-123’s up to the 140 ELD’s.
That should give me a 16” gasser that will go to 1000yds super sonic. My .308 takes 185 Berger’s to be super sonic at 1000.