Is there enough shoulder left to head space off of? If it has been done, wich i'm sure it has,what is it called and do i need a special reamer?

Paul K

Have no fear 470 Mbogo has done it for you!
Enjoy!!!

There is a big difference between a 416 Rigby being just necked up and the 470 Mbogo. It has been done before by a couple of people. On the 460 Weatherby case it's called the 475 A&M. It is listed in Cartridges of The World with some really bizzare ballistics. I still haven't figured out why they keep publishing those ballistics.
Take good care,
Dave

Sorry Dave I forgot the Mbogo has a lot more case capacity.

You can headspace off of .010 with no issues. I have built two .470 Mbogos. they are great!-Rob

how about a 475 on the 505 Gibbs case? I just happen to have a reamer...hmmmmmmmmmmmmm?

Rich
DRSS

Rich,
To illustrate your point, some of my dummies:



Above are a fireformed 470 Mbogo and a .475/.505 Gibbs mockup aka ".475 Kifaru."

The Brothers Gibbs: .408, .475, .505, .510

RIP ;; is that what the 408 CheTac is ,, a 505 necked to 408 ??? Quite a useful looking round...

gumboot458,
Yep, the .408 Cheyenne Tactical is a .505 Gibbs necked down for .408-cal/400-grainer and the case shortened by about 0.1" and given a shoulder that looks to be about 20 degrees like the .338 Lapua and the .395 Tatanka.

I think Saeed has the 416 Rigby Improved necked to 475. On the non forum part of his site I think he has some top groups whot with.

If memory is working for me he comverted a Dakota 76

quote:

Originally posted by Robgunbuilder:
You can headspace off of .010 with no issues. I have built two .470 Mbogos. they are great!-Rob

Thanks Rob, I didn't know just how much of a shoulder you needed to have to head space off of. I personally just want to neck up the Rigby case to .475. I think this will give me all i need. A poor mans 470.

Paul K