Any updates on 6.8 X 51

To my knowledge the case is reloadable. I just purchased 100 cases and waiting on them to arrive. I’mgoing to re-size 50 of them to 6.5 Creedmoor. The other 50 I’m going to attempt to neck down to 6mm and see what happens. The 6.8 doesn’t have much options for projectiles compared to others.

Yea if you necked it up to 7mm or down to 6.5 you’ll have a lot more options

I've been shooting hybrid cases since they first came out in many calibers.
They can be altered to fit any 308 case head cartridge, like 6.5 CM, 7mm-08, 308, 338 Fed, 358 Win, 8.6 Blkout, 6 Dasher, etc.
But I haven't chambered a .277 barrel, because quality reamers were not available...the high pressure of the case has scared most off and some concerns are validated.
Sig had a few civilian rifles chambered for it at first, then stopped.

I’ve seen someone else on YouTube said to make 6.5CM they just trimmed it down to length and then ran it through a die.

I think I’m going to try cleaning and then annealing. Then trim to length of CM case and lube the he’ll out of it and run it through a 6.5 die. Think that would work?

leungken said:

I am thinking on adding a new caliber to my rifle collection, and is chewing on the idea of 6.8 X 51

Click to expand...

And screw the barrel onto "what"?

No thanks.
Not sticking my eyeballs behind a receiver designed for max 65 kpsi with an 80 kpsi cartridge in the chamber.


Call me crazy... yep, those engineers are just too damned conservative- it'll be fine...

I’m not necessarily saying you have to run the pressure all the way to 80k but maybe give it a bit more and they suppose to give a little more case capacity. I think we’re gonna start seeing more HP cartridges in general over the years. About to release the 7mm back country. I’m sure the other manufacturers are gonna come out with some too.

45-90 said:

I've been shooting hybrid cases since they first came out in many calibers.
They can be altered to fit any 308 case head cartridge, like 6.5 CM, 7mm-08, 308, 338 Fed, 358 Win, 8.6 Blkout, 6 Dasher, etc.

Click to expand...

I'll probably regret it, but I'm curious: where can one find more information on these 'hybrid' cases?

New Seekins Havak’s are available in 277 Sig.

What Troops Really think of the Army’s new XM7 rifle

And it’s a total POS. US Army and PEO Soldier cherry-picked only positive comments from soldiers, while deleting these, so one of them went to Reddit.

“I was recently quoted in multiple publications saying nice things about the Sig XM7 / Vortex XM157, and unfortunately, the 10 minutes worth of critiques I had before saying one nice thing didn’t quite make the cut,” u/vindictivevader wrote in an r/army post. The user, who appears to be Sgt. Colston himself, goes on to explain the issues that he experienced during the live fire and about 2,000 rounds through one XM7. “I have never seen a weapon have so many malfunctions. Namely, failure to extract/eject even when properly cleaned (checked by sig guy) and on adverse gas setting using the GP round.” When new weapons are fielded by the military, product experts are sent by the manufacturer to train the end users. The XM7 is designed to be run with its suppressor and the adverse gas setting allows increased gas into the system to cycle the weapon more violently in case it is dirty. “two-piece casing blows apart occasionally, stuck casings are common in the XM250.”


The XM157 was touted as an advanced digital optic that takes the guesswork out of long-range shots using lasers and computers. However, a digital scope is bound to have teething issues. “The Vortex XM157 is shit. I usually like vortex products, but this one is bad,” u/vindictivevader wrote. “Several ocular focus adjustment rings/diopter adjustments just randomly migrated, the brightest setting is nowhere near bright enough (almost invisible on a sunny day)…Severe zero migration on the lasers.”