Look at the specs and wondering if a 6.8 SPC could easily be rebarreled to a 6mm ARC? Would it be hard to get to feed correctly? Would you need to open up the bolt?

The bolt face would have to be widened and possibly extractor modified. The correct magazine width and follower for each cartridge may also be different. Feeding might be a problem. Better off going 6mm SPC and using 90 grain projectiles. Easy to neck down the old 6.8 brass in one go. Dies for 6mm SPC are readily available from CH4D.

Does anyone have any data on how fast the 6 SPC will run with a 90 grain bullet?

Yes. In a 22" barrel you can get 2950 fps without going too high in pressure. However, it will depend on the length of your magazine and the throat length of your chamber. If you seat out to 2.44", 2950 fps is easy. If 2.30" then it might be a struggle. Do an 8 twist barrel.

C4HD has very nice 6mm SPC dies. The SPC has a slight edge in case capacity over the ARC, so you can use ARC data in the 6mm SPC.

And in a Howie mini, you get 5 in the mag instead of 4 with the ARC, and they feed better than the ARC. Oregunsmithing do a 6.8 SPC magazine and follower which is different to their ARC magazine and follower. Internal length is about 2.48"

Thank you all - good stuff.

Isn’t Wayne Yorks 24 York essentially the 6 SPC?

I know he did a .25 on the SPC case. But then you have 100 grain .257 projectiles which have poor b.c.'s compared to 90 grain .243 projectiles and slightly slower.

Thanks to all for this good info. I have a CZ 527 that has been re-barreled to 6.8 SPC. Thinking I might need to send it off and make a 6 SPC out of it. Would make a hell of a combo pig/deer gun.

You might find that the 6.8 SPC using 110's at around 2800 fps is actually better than a 6mm SPC with 90's at 2950 for deer and pigs. Don't underestimate the 6.8 SPC. If coyotes as well, the 90 grain 6mm would be very good.

Pass the 22 PPC AFI and hold the fluff. Hint.



SniffleKchunt hasn't ever seen or shot any of it. Pass the Lapooey brass. Hint.

Fhuqking LAUGHING!................

Dumbschidt, we're talking 6mm, not .22

SniffleKchunt,

It will only come as a "surprise" to you,that abandoning the .277" Goat Fhuqk,requires a barrel/bore swap...you "lucky" kchunt. Hint. Congratulations?!?

Due the fact that I simply shoot it all,as you Google and Guess aloud,I'll greedily take the 22PPC AFi and make it 7" RPM. Mainly because I've a "few". Hint.



Fhuqking LAUGHING!.............

Of course you would need to rebarrel your 6.8 if going to 6mm. The OP said that already....fhark you're dumb.

SniffleKchunt,

Gals who "know" and "do" as "much" as you,will ALWAYS be best served by asking questions,rather than giving "answers"...you "lucky" kchunt. Hint. Congratulations?!?

1-7.5" ARC here. Hint.




Fhuqking LAUGHING!................

Alright, I will ask a question. Do you want to tell us about what happened when you were in Oregon?

'Nother 7" RPM 22PPC AFI here...you "lucky" kchunt. Hint. Congratulations?!?



Fhuqking LAUGHING!...............

Basically, except that his requires more case forming or he'll sell you brass at $2+ per piece.

If you decide to part with that CZ 6.8 and just pick up a 6ARC, let me know.

I’ve had plans for a 6.8 SPC bolt gun for years and never made it happen.

For my hunting needs, the 6.8 fills the niche better than the ARC.

If the bulk of my hunting shots were beyond 200, I’d be all over an ARC.

You are right about the 6.8 SPC. My pig gun is a Ruger Mini 30 rebarreled from 7.62x39 to 6.8 SPC. I shoot hogs and coyotes with it and it is a hammer. I haven't reloaded for it but shoot factory 110 VMAX & 120 Sierra Pro Hunters.

I've made my gradual progression from 6.8 SPC to 6.5 Grendel and finally to 6mm ARC. For general shooting I much prefer the ARC good 6mm target and hunting bullets at useable velocities, at mag length without encroaching into space better used for powder.

Don't know why anyone would bother with 6 SPC wildcats now that the ARC is available, seems like a lot of pain in the ass to get similar speeds with varmint bullets, and not be able to use the heavier bullets at all. More effort and money for less capability, flexibility and industry support.

I don't know anyone who would want to hunt at normal distances with 90 grain bullets out of a 6mm SPC and have a relatively flat trajectory over that distance when they can fantasize about hunting game at 600 yards with a 6 ARC and never have to get away from their computers. And who would be stupid enough to want an extra round in the magazine and have cartridges that feed smoothly? No one, surely.

SniffleKchunt,

You've never seen,let alone shot ANY of it...you "lucky" kchunt. Hint. Congratulations?!?

'Nother 22 PPC AFI here amidship,in 'Bravo chassis,betwixt Garrow Hummer and Vudoo 22LR. You better Google those too. Hint.



Fhuqking LAUGHING!...............

You sure like ugly rifles.

They are masterpieces of beauty compared to what he looks like. Think fire hydrant with a nose ring.

I've got 10, 15, 20 and 26 round mags from ASC, Duramag and Cprod that have worked fine for me with Grendel and ARC, feed well, I'm not worried about one extra round.

My ARCs have run 85gr, 90gr, 95gr, 100gr, 105gr, 108gr and 112gr bullets just fine, in fact my latest loads have been 90gr TGKs at mag length out of my 18" at a bit over 2,800 fps (best accuracy, but have run up past 2,900 fps). I can run lighter bullets if I want to, it's just not my only option, and I get away from my computer and behind rifles plenty, dick.

Not everyone wants large magazines protruding from their rifle when they are wanting a very light slim rifle, dich-hed. What's the next cartridge you're going to "progress to"?

They are ARs you chode, you were the one complaining about losing one round capacity, now the standard mags are too much? Don't see myself moving away from the 6 ARC anytime soon, it fixed most of the things that I didn't care for in the the SPC and Grendel, and the industry support is catching up to the Grendel. It's about the best you can do in an AR for general purpose thus far. SPC has the weakest support out of the bunch at this point, it was the top option when I had mine 12-ish years ago, but has really fallen off.

Everyone on this thread has been talking about bolt-action rifles not ARs you chode-head.

It's just as easy of a decision for bolt actions as for ARs, a 6mm wildcat based on a dying parent case would be my absolute last choice, and only if the OP couldn't get a new bolt head, or the bolt cut and the rifle had some kind of sentimental importance. Otherwise modify the bolt and get a barrel, or sell the rifle and get one of the several factory 6mm ARC rifles or even prefits being offered. Going that route OP would have factory ammo if needed, cases soon to be released from Starline and Petersen and higher pressure ARC bolt gun book load data, to dial the performance up even further.