I was wondering if anyone has widcatted the 505 gibbs. I know of the 530-505 woodleigh, but necked down to say, 475,458, or even 416, should make an interesting round. I'm just curious..

Not sure where my reply disappeared to ...



Anyway.



408 Chey Tac is (more or less) 505 Gibss based, as is the 416 [strikethrough]Taylor[/strikethrough] Prairie Gun Works. A 338 variant is under development.



Not sure of any 475 or 458 versions.



Edited because I am a moron. Dr. Taylor was (one of) the developer(s) of the 408 CT. The "normal" version is the 416 PGW, which I inadvertently called the Taylor (after Doc), which has nothing to do with the regular Taylor series of cartridges ... I think I will just go to bed ...

okay...

take one of the most expensive and hard to find brass...

make a wildcat off it...

when the weatherby 460 cases offer all the capacity one could ever use

jeffe

There's the 470 Royale, I believe, which is full-length, necked to .475"; sounds like a beast to me, but I have to agree, Rigby/Whetherby has as much room as needed for most abuse.
The 470 Mbogo would've been a shooting star in 1912. Alas.

.470 Mbogo is an awfully manly cartridge...

There's a 416 PGW or Prarie Gun Works, which is based on the Gibbs case (I think?).

It was just a thought,I agree that the Rigby/Weatherby is a better choice, just wanted to be different. I think the 470Mbogo is great, someone should have thought about that 100 years ago,I'm working on getting the funds for one right now, kinda hard with a 16 month old girl and another on the way, but who knows!!!!

And here is a case you can make from Gibbs/Cheytac
basic brass.Thr hairiest thing you can do with that case.
I built these first ones from Nyati case, but others will do also.It is fourth one, 550 HE belted case, made from Nyati the third case..Ed

I have a barrel and a bunch of cases , reloading dies(after a fashion) that I got in the purchase of a Hoffman .505 Gibbs with Mag. Mauser action in about '72. I made the mistake of selling the Hoffman to someone, but the other stuff stayed around. The case is shortened to 2.75 inches, neck reamed in a .458 bullet diameter. I haven't a clue what it is called. If anyone has a clue about this 'cat it would be interesting. I haven't even measured case capacity, but I expect it could be made to run 2400-2450 FPS without to much work.

'416sw' who posts here made a 416/505 but Bertrams brass was not able to provide much more speed than a normal 416Wby.
Horneber's brass is the other option.
A chey tac wildcat would be even easier as mentioned.

416PGW- 3000fps with 400gn
375PGW- 3150fps with 300gn
458 or 475- 2800fps with 500gn
etc.

Well, the gentleman in our shop who developed his version of a 338-408 (or 505 if you will) has taken it out for some test shots, and it would be an understatement to say that it is turning in some amazing groups.

Using the 300 gr Sierra Match King, his muzzle velocity is 3140 fps with single digit spread (less than 5 fps) and no pressure signs on the case. He test fired it at 100 yards and the difference between F215 and WLRM primers was significant. He then "simply" dialed it in for 1,000 yards, stuck a target up and proceeded to fire a 3-shot group that was independently confirmed at 1.96" ....

Best we can tell the 300 SMK is still trucking at 2100 fps at impact on target (you should see the dust cloud, they say it is impressive when it strikes the back stop) and he plans to try it at 2000 yards after getting a solid 5 or 10 shot group sub 2" ... all this with no more than 27 rounds through the rifle ...

Wish I could shoot like that ...