Hello.

Can anybody give me some spesifications on this cartridge, please?
Is it a true .408"-caliber?
How many grains of water do the case take?
Approx. velocities?
Where to get cases, and approx. price?

I was awake last night, wandering about this things!

From the Accuload data base
Bullet diameter 0.4080
Trimmed case length 3.320
Max OAL 4.420
Standard twist 1:13"
SAMMI pressure 70,000
Rim diameter .640
Water capacity 165.3gr

Try this website, (http://www.cheytac.com/) I think this will answer most of your questions. I believe that the .408 Cheytac is based on the .505 Gibbs case. I don't know which would be the more expensive but, necking a .505 down to .408 might loose you some cases. It might be better just to suck it up and by the Cheytac cases.

The Cheytac cases are much stronger than traditional Gibbs and you would be in a world of hurt if you ran 70K over and over in a Gibbs case. Probably have loose primers after one or two firings. Also, a lot of bolt thrust. I'd be sure to have the right action for it.

Word has it that Jamison brass for the Cheytac and 505 Gibbs use the same basic web design and are probably priced similarly. I am building a 505-416 one day just to avoid the dearth of .408 bullets and I plan to try necking Jamison Cheytac brass to .416 if they'll fire-form.

FWIW, Quickload says 3.040 case length, 169.0 gr water. MOAL 4.515 and max psi 63,817. Don't know which is right.

quote:

Originally posted by tiggertate:

FWIW, Quickload says 3.040 case length, 169.0 gr water. MOAL 4.515 and max psi 63,817. Don't know which is right.

By golly, I believe you nailed it Tigger, lengths, water capacity with Jamison brass, and the recommended maximum average pressure. That would allow the excursion toward 70,000 psi, which the Jamison brass would handle, no worries.

A .416/.408 Chey-Tac would make an excellent RIPoff cartridge for my stable of wildcats, if I wanted to get into wildcatting with 50 BMG type actions, but then, why not just do a .416/50 BMG RIPoff?

Please use the American system of nomenclature! Don't be so stuffy faux-British! Yours would be a .416/.505 Gibbs if you speak American.

The .416/.408 Chey-Tac has already been done and shown by one of our Aussie friends here.

Barrett has already done the shortened 50 BMG as a .416 Barrett.

I would rather shoot a .416 Rigby at 65,000 psi (dang, .416 Weatherby) than fuss with a .416/.408 Chey-Tac that would be limited to 55,000 psi in a CZ 550 Magnum action, due to the bolt thrust issues with the .640" diameter case.

I just measuerd my sample (was at work earlier), and with a headstamp of "408 Chey-Tac XM-2" my NUE (New Unprimed Empty) measures 3.028 in length.
Looks like I should go into my copy of "Accuload" and make a correction to the database, eh?

RIP Why not look at doing a 416/50 Spotter (12.7x76) instead of the 416/50 BMG (12.7x99)? The smaller case capacity would be more inline (although still overbore) than the BMG case, and a inch shorter action wouldn't be a bad thing either.

quote:

Originally posted by tiggertate:
The Cheytac cases are much stronger than traditional Gibbs and you would be in a world of hurt if you ran 70K over and over in a Gibbs case. Probably have loose primers after one or two firings. Also, a lot of bolt thrust. I'd be sure to have the right action for it.

Word has it that Jamison brass for the Cheytac and 505 Gibbs use the same basic web design and are probably priced similarly. I am building a 505-416 one day just to avoid the dearth of .408 bullets and I plan to try necking Jamison Cheytac brass to .416 if they'll fire-form.

FWIW, Quickload says 3.040 case length, 169.0 gr water. MOAL 4.515 and max psi 63,817. Don't know which is right.

Look at 416 PGW. It's a neck down of the 408. apparently PGW was thinking of doing a whole lot of wildcats off the 408 several years ago and only did the 416. The story of how the dies for the 408 got around from person to person is interesting in its own sake.

quote:

Originally posted by RIP:
A .416/.408 Chey-Tac would make an excellent RIPoff cartridge for my stable of wildcats, i

tigger's already got the reamer 505/416 (heh) is in exactly pairing with the 500/416 NE, 450/400, etc.. and equally as valid as calling it a 416/505, as neither system hold the patent on "being easy to understand" :LOL

jeffe

quote:

Originally posted by Tailgunner:

RIP Why not look at doing a 416/50 Spotter (12.7x76) instead of the 416/50 BMG (12.7x99)? The smaller case capacity would be more inline (although still overbore) than the BMG case, and a inch shorter action wouldn't be a bad thing either.

As pointed out, Barrett has already done it.

And PGW has already done the .416/.408 Chey-Tac, as well as the Aussies.

I better quit trying to be "different" and just go hunting, maybe even with my old .375 H&H.

Nomenclature rules: Americans speak "American." USA is boss in this department. Forget the faux-British names for new cartridges please. It is annoying.

quote:

Nomenclature rules: Americans speak "American." USA is boss in this department. Forget the faux-British names for new cartridges please. It is annoying.

Since they were naming cartridges before we were born, I figure I'll follow them. Nothing "faux" (that's French, by the way) about it.

quote:

Originally posted by interboat:

quote:

Nomenclature rules: Americans speak "American." USA is boss in this department. Forget the faux-British names for new cartridges please. It is annoying.

Since they were naming cartridges before we were born, I figure I'll follow them. Nothing "faux" (that's French, by the way) about it.

"Faux" is a French corruption of the Latin "falsus," pronounced like "foe," and of common English usage to mean "artficial" or "phony." I am a foe of faux-British cartridge nomenclature.

Very annoying when a cartridge name begins with a caliber designator that doesn't reflect the bore of the rifle barrel in some way.

Just my honest sensibility. Of course, I see no reason to extend my pinky finger when I drink tea from a cup either.

I would much rather wake up and smell the coffee. Adapt convention to reality rather than live in the past with a FAUX-BRITISH nostalgia for cartridge designation.

BTW, many on this side of the pond prefer to start a rifle cartridge name with something that reflects the caliber of the bullet, or some semblance of it. It is only logical, for what the rifle does, it does with that bullet flying through the air.

I'll just call it the 416 Crackhead in honor of your ramblings, RIP

quote:

Originally posted by tiggertate:
I'll just call it the 416 Crackhead in honor of your ramblings, RIP

Progress!

At least you are starting the nomenclature properly.

Just to ramble some more:

Saeed pronounces "Fox Network" as "Foe Network" or "Faux Network."

Misguided as he is, he still calls his cartridge the .375/.404. He ain't stupid after all.

quote:

Originally posted by RIP:

The .416/.408 Chey-Tac has already been done and shown by one of our Aussie friends here.

Ripster, it was done long before that, by the Canadians. The caliber was called the .416 PGW (for Prairie Gun Works). I think that I finally new something that you didn't!!!!

HERE'S the chambered calibers.

quote:

Originally posted by woodsracer:

quote:

Originally posted by RIP:

The .416/.408 Chey-Tac has already been done and shown by one of our Aussie friends here.

Ripster, it was done long before that, by the Canadians. The caliber was called the .416 PGW (for Prairie Gun Works). I think that I finally new something that you didn't!!!!

HERE'S the chambered calibers.

Geez Woodie,
You are not reading too closely, as this was pointed out by another member above: I Bin Therbefor

I knew about that one long ago too, I just don't always include everything I know in every post. It is old hat, I know, and I suffer from selective memory and sometimer's disease.

You are to be commended for pointing out the .416 Barrett a while back, right after I read about it in a gun rag.