Unless I am mistaken both the 416 Barrett and 416-600 Overkill would have 200 grain case capacity.
A 416 Barrett will cost you big bucks where a 416 rigby 550 CZ conversion to a 416 Overkill could be done for a few hundred dollars. This would give 408 Chey-tac performance but at lower pressure since there would be a 20 grain capacity gain. And equal the 416 Barrett. Rob, have you done a 416 Overkill? What is your opinion on this?

sounds interesting....

You should get what ever you want.

Boomstick- No I never did a .416 Overkill. The lowest we went was a .458 Overkill. my concerns would be barrel life. The same reason I don't own a Chey - Tac. I have my doubts a barrel would last 500 rhea.-Rob

Agreed barrel life would not be great but if the same as the 416 Barrett would get. You could get a 30" bull barrel and keep shortening as accuracy falls off but I would think maybe 1000 shots. Shoot 400 grain Barrett bullets @ about 3,000 fps for a nice 1,000 yard paper puncher.

The 600 Overkill is relatively low pressure compared to the .408 Chey-Tac or .416 Barrett.
Bolt thrust must be OK with the 600 OK?

A .416/600 Overkill to equal the .416 Barrett (395 grainers at 3250 fps) would require a 50BMG capable action, due to bolt thrust issues.
But then could the brass stand the pressure in the .416/600 OK?


You cannot shoot full pressure .408 Chey-Tac loads (70K psi) in a CZ 550 Magnum for very long.
The action life would be much less than the barrel life!

Could a .416/600 OK work at sustainable pressures in a CZ 550 and equal the .408 Chey-Tac?

I think .416 Weatherby ballistics would be more realistic in a CZ 550 Magnum, by whatever route, and that can be done with the smaller Wby/Rigby cartridge case,
unless you want to go to a 50 BMG action,
but then why not just use the .416 Barrett for tops? And have a switchbarrel 12gaFrom Hell for it too?

Buy a 416 Wby off the rack and be done with it or buy a McM G30 action and build a phat bbl'd 416 Wby. None of these overbore iterations of whatever up to and including BMG based combobulations are gonna overcome the laws of physics. If you wanna get waaay out there you'll need a BIG bullet moving VERY fast and that requires a big case. MUCH bigger than anything in the 250 grain capacity range. You'll need to make your own action and have a friend to help you tote it around and be your spotter.

Boomie,

You think too much.

quote:

Originally posted by Bitterroot:
Boomie,

You think too much.

sometimes.. amen!

Fwiw- I'll bet money a CZ 550 will take a 85 kpsi blue pill and stay together. Been there and done that! Horneber cases would easily take 65 Kpsi. The problem is both the throat and muzzle erosion when burning 200 grs of powder through a .416 hole. My competition .50 BMG barrel died at 1000 rds and I loped off the muzzle every 250 rds. Looked like the craters of the moon after 500 rds from the throat forward. Have to say that a steady diet of 70KPSI rounds would not get me very excited. I've never been a fan of the .408 Chey-Tac anyway.-Rob

quote:

Originally posted by Bitterroot:
Boomie,

You think too much.

Yeah... Guilty

quote:

Originally posted by Bitterroot:
Boomie,

You think too much.

Sure, but they are good questions and he is never mean spirited ...

What you guy's think about my 416-505 gibbs, I have barrel and reamer, and a montana ph action on the way. I will order dies this weekend. I am thinking I should be able to get about 2800 fps with a 28" barrel with a 350gr or 400gr tsx on about 140-150 grs of rl22. I like the shape of the reamer, feeding should not be a problem with the ph action.
I should be able to get a about 1500 yards before it drops subsonic.

JD

JD

JD- You do realize that you can get 2800fps with a .600OK with 750 gr bullets don't you? There are not enough Aerodynamically designed bullets for the .416 to be a long Range cartridge unless you have a design made by CNC. Thats why we tried a .50-.600OK for 1000yrd competition. To make use of the great bullets available.-Rob

Rob, what are getting in velocity with 750 A max bullets on the 500-600 OK?

When we pushed them real hard, 2750 fps. With 800gr Bore riders 2800 fps. It was a pretty efficient cartridge nearly equal to the .50BMG. Trouble was it was only legit in the unlimited class and the Mule we built wasn't competitive with the 100lb class guns.-Rob

Well that's pretty cool to get that close to the 50 BMG considering it can be built on a ZC550