Anyone ever make a .423 on a .416 Rigby case? Seems to me would be the best of atleast 3 worlds

best? LOL .. you must work for a die, brass, bullet, and action company!!
expensive brass, odd duck bullet, and long actions? best of three worlds for draining your wallet!

The .423 Dakota, AKA .423 Dakota-Lapua, is the Rigby case shortened to 2.5" and 30-degree-shouldered. At least two rifles have been made in that caliber.

I simultaneously developed the .423/.338 Lapua Mag., unwittingly RIPping off Dakota, eh? At 2.7" case length, with the unadulterated .338 Lapua Mag. simply necked up (20-degree shoulder unchanged), it did no more than the standard .404 Jeffery with 2.85" case length. So I took the barrel off that one and did the .395 Tatanka (2.9" and 20-degree shoulder with .395" neck length and .395" bullet diameter, wow) with that Dakota 76 African action.

I have thought of necking the .395 Tatanka up to .423, same full length .416 Rigby case with 20-degree shoulder. That would be the ".423 Tatanka," of course.

If you recall, there was once a ".416 Ruger" built for Bill Ruger. It was simply the .416 Rigby with a 30 degree shoulder, instead of 45 degrees. It was done on a Ruger No.1.

The ".416 Tatanka" was a .404 Jeffery necked down to .416, by someone named "Bo" long before I independently thought of using the word "Tatanka" (Lakota for "bison bull") as a cartridge name.

Now I am merely boviating and bloviating ...

.423/.416 Rigby?
Nope, never seen one.

Wait.
Better check the Howell book for that .423/.416 Rigby, anybody got a copy handy?
It may be Friday night before I get a chance to look that one up.
I vaguely recall looking it up in Howell before.
Sometimer's Disease has set in again ...

Close but no cigar. Here is what I was looking for, from Dr. Ken Howell's designing and forming CUSTOM CARTRIDGES for rifles and handguns:

430 Gibbs: the .416 Rigby necked up to .435 ala 425WR:


.423 Van Horn Nitro ... The Master, Gil Van Horn, beat Dakota to this one, long ago, a shortened .416 Rigby with a .423 bullet, like the .423 Dakota-Lapua. Gil had to turn the belts off .378 Wby brass. 1970's?:

I posted drewhenrytnt's question on the Big Bore Forum to see if sumbuddy who know would see it there.

It is done.
.423/.416 Rigby 2.9" 20-degree: The .423 Rigby

Long live the .423 Rigby!

L to R:
.423 Rigby
.423/.338 Lapua Mag.
.423 Dakota-Lapua


.423 Rigby, top
and
.395 Tatanka, bottom:


.423 Rigby with 320-grain GSC HV: