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BOS and BOSS belted brass
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RIP has a blown out Rigby case to .510”
The 460 WBY case has been necked to .510” in a 500 A2 and 495 A2
The 460 Wby has even been necked to .550”!

But let’s get to something interesting...

Following the BOS and BOSS ethos...
Take the 460 WBY case
Trim off the belt
Add a new belt on the .582” casehead to .555”
Voila!
Belted Ultra Mag! BUM
Belted Ultra Mag Straight! BUMS (.510, .500 and .475)
Maybe call it the Belted Straight Ultra Mag or BSUM (Now that is sexier, sounds like busom) and Belted Ultra Mag BUM (Butts and boobs lol)

There we go,
BUM and BSUM

The real advantage really lies in a non rebated belted case for DG purposes or a case that does not need to headspace on a shoulder and/or a slightly longer modified RUM case (Think of a longer and belted 338 Edge like case)

For my tastes, a belted RUM to 510, 500 and 475 are interesting and would be something new.


577 BME 3"500 KILL ALL 358 GREMLIN 404-375

*we band of 45-70ers* (Founder)
Single Shot Shooters Society S.S.S.S. (Founder)
"Bubba" by the grace of God.

Four legs good! Two legs baa-d!

E Pluribus Popularem et Republican (Out of many, Democrat and Republican)

“We hold these truths to be self-evident. All men and women created … by the — you know — you know the thing.”

Joe Biden.
 
Posts: 26123 | Location: Where tech companies are trying to control you and brainwash you. | Registered: 29 April 2005Reply With Quote
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There are many paths to a similar result, but after seeing what MoreBS has done with his belt forming dies, I prefer the idea of a belted big fifty case. A belted RUM case requires more work and provides less taper for extraction purposes - this is likely why the 500 MDM was developed using 0.500” bullets, ie it simply didn’t have enough taper to use 0.510” bullets.

As outlined earlier, it could be formed from relatively inexpensive 338 Lapua brass, with a belt formed the same diameter as the donor case head. None of the case forming requires any lathe work, so relatively easy to form. The body ahead of the belt is reduced to 0.565” for a non rebated, belted case with a case that has adequate taper for good extraction using 0.510” bullets.
 
Posts: 391 | Location: Melbourne, Australia | Registered: 19 June 2006Reply With Quote
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I hear you.
8 thousandths difference between the Rigby and the casehead of the WBY case though.
With 20 thou for a belt, that leaves about 33 thou for taper with a .510” bullet on the Rigby and 25 thou for belting a WBY case down 20 thou for a belt or 18 thou for a .555” RUM size casehead with a slightly beefier belt. Both would work fine. In my mind, I can’t justify the extra cost and work for belting the Rigby case when the 500A2 and 495A2 are so similar but wildcats are about fun and a mental disorder in which I am the most insane.


577 BME 3"500 KILL ALL 358 GREMLIN 404-375

*we band of 45-70ers* (Founder)
Single Shot Shooters Society S.S.S.S. (Founder)
"Bubba" by the grace of God.

Four legs good! Two legs baa-d!

E Pluribus Popularem et Republican (Out of many, Democrat and Republican)

“We hold these truths to be self-evident. All men and women created … by the — you know — you know the thing.”

Joe Biden.
 
Posts: 26123 | Location: Where tech companies are trying to control you and brainwash you. | Registered: 29 April 2005Reply With Quote
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A belted Rigby or WBY case would be easy to get to feed from a Rigby donor gun considering the case geometry.


577 BME 3"500 KILL ALL 358 GREMLIN 404-375

*we band of 45-70ers* (Founder)
Single Shot Shooters Society S.S.S.S. (Founder)
"Bubba" by the grace of God.

Four legs good! Two legs baa-d!

E Pluribus Popularem et Republican (Out of many, Democrat and Republican)

“We hold these truths to be self-evident. All men and women created … by the — you know — you know the thing.”

Joe Biden.
 
Posts: 26123 | Location: Where tech companies are trying to control you and brainwash you. | Registered: 29 April 2005Reply With Quote
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Seems as if something like a longer basic .284 Winchester case might be a good starting point (0.501" base; 0.473" rim) from which to swage a belt for a BOSS tapered case. You could get Peterson to make some basic brass with these dimensions:
https://www.petersoncartridge....brass/wildcat-tubes/

Alternately, 9.3x64 Brenneke brass is long enough and close to those dimensions (0.507" base; 0.496" rim) but is expensive.
 
Posts: 105 | Location: SC | Registered: 10 March 2017Reply With Quote
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If the 284 Basic was just a little longer, it would make a nice 444 Belted!


Get Close and Wack'em Hard
 
Posts: 285 | Registered: 15 March 2004Reply With Quote
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