THE ACCURATERELOADING.COM WILDCAT FORUM

Page 1 2 

Moderators: Paul H
Go
New
Find
Notify
Tools
Reply
  
BOS and BOSS belted brass
 Login/Join
 
One of Us
Picture of boom stick
posted Hide Post
Turn the page...
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)
 
Posts: 27589 | Location: Where tech companies are trying to control you and brainwash you. | Registered: 29 April 2005Reply With Quote
One of Us
posted Hide Post
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: 499 | Location: Melbourne, Australia | Registered: 19 June 2006Reply With Quote
One of Us
Picture of boom stick
posted Hide Post
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)
 
Posts: 27589 | Location: Where tech companies are trying to control you and brainwash you. | Registered: 29 April 2005Reply With Quote
One of Us
Picture of boom stick
posted Hide Post
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)
 
Posts: 27589 | Location: Where tech companies are trying to control you and brainwash you. | Registered: 29 April 2005Reply With Quote
One of Us
posted Hide Post
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: 118 | Location: SC | Registered: 10 March 2017Reply With Quote
one of us
Picture of MoreBS
posted Hide Post
If the 284 Basic was just a little longer, it would make a nice 444 Belted!


Get Close and Wack'em Hard
 
Posts: 404 | Registered: 15 March 2004Reply With Quote
one of us
Picture of Wildcatter
posted Hide Post
What about just blowing out a 240 Weatherby straight? Much less fiddly work than cutting belts on cases. That would give you a belted 06 case albeit with a 0.472” rim diameter. You may be able to squeeze out a case length of 2.450”. I thought it strange no one had mentioned it. I sure like the idea of a 400 or 416 Whelen with better headspace control on a short light Mauser 98!

RC


Shoot the largest caliber you can shoot well, and practice, practice, practice.
 
Posts: 788 | Location: Central Texas, U.S. | Registered: 20 December 2001Reply With Quote
one of us
Picture of MoreBS
posted Hide Post
Been thinking about the 400 BOSS.

What size to make the base.

I have some 40-90 Sharps Straight brass, it has a .477 base.

I need a new reamer for this brass, and my brother just got a slotting head for his old Bridgeport!

So, I need to start my drop block actions for the 40-90 brass. 2450 fps out of a 350 grainer is expected. 46,000 psi. not hot loads.

Back to the BOSS, 300 win Mag brass. Belt will be .500-.505, Base .480, with a .473 head.


Get Close and Wack'em Hard
 
Posts: 404 | Registered: 15 March 2004Reply With Quote
One of Us
Picture of boom stick
posted Hide Post
quote:
Originally posted by MoreBS:
Been thinking about the 400 BOSS.

What size to make the base.

I have some 40-90 Sharps Straight brass, it has a .477 base.

I need a new reamer for this brass, and my brother just got a slotting head for his old Bridgeport!

So, I need to start my drop block actions for the 40-90 brass. 2450 fps out of a 350 grainer is expected. 46,000 psi. not hot loads.

Back to the BOSS, 300 win Mag brass. Belt will be .500-.505, Base .480, with a .473 head.


Let me think n this a bit.


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)
 
Posts: 27589 | Location: Where tech companies are trying to control you and brainwash you. | Registered: 29 April 2005Reply With Quote
one of us
Picture of MoreBS
posted Hide Post
The reamer would be .480, brass would be .476-.477".


Get Close and Wack'em Hard
 
Posts: 404 | Registered: 15 March 2004Reply With Quote
One of Us
Picture of boom stick
posted Hide Post
Ok, here are some thoughts...the name infers the 06 case. If you want to headspace off the mouth for every day shooting and plinking, you could use cheap and plentiful 06 brass and when things are more serious, use the more expensive and rare Belted Ought Six brass. You could use the larger case capacity 9,3x62 brass or 370 Sako brass but that would leave a sloppy chamber for 06 brass use.
I think the use of nominal 06 brass makes this a more desirable and practical wildcat(oxymoron, I know)
I would love to see the success of this cart.
Fun to see the ability to use 425 WR, 44-444, 404, 416 and 400 bullets on this case.
popcorn patriot


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)
 
Posts: 27589 | Location: Where tech companies are trying to control you and brainwash you. | Registered: 29 April 2005Reply With Quote
one of us
Picture of MoreBS
posted Hide Post
Ok, but there could also be a BSS, Belted Sharps Straight.


Get Close and Wack'em Hard
 
Posts: 404 | Registered: 15 March 2004Reply With Quote
One of Us
Picture of boom stick
posted Hide Post
As far as dimensions, I see the easiest way to go would be a the 06 taper straight to the .411“ opening so you could use a 06 reamer with a 411 neck throater reamer pilot with the only difference being the belt dimensions. this would make forming brass a breeze with regular 06 brass.


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)
 
Posts: 27589 | Location: Where tech companies are trying to control you and brainwash you. | Registered: 29 April 2005Reply With Quote
one of us
Picture of MoreBS
posted Hide Post
quote:
Originally posted by boom stick:
As far as dimensions, I see the easiest way to go would be a the 06 taper straight to the .411“ opening so you could use a 06 reamer with a 411 neck throater reamer pilot with the only difference being the belt dimensions. this would make forming brass a breeze with regular 06 brass.


You cannot use 06 reamer and brass, you would need to have bigger brass for the belt. Sure would be nice if you could.

I have the belted 405, made from 06 brass. Was not able to test it on a deer this year. maybe next!


Get Close and Wack'em Hard
 
Posts: 404 | Registered: 15 March 2004Reply With Quote
One of Us
Picture of boom stick
posted Hide Post
Sorry for the confusion, I was thinking of the flexibility of having the option to use regular 06 brass and headspace off the case mouth in addition to the BOSS brass if you use a rebated rim to .470 or use a second bolt with the right bolt face diameter.


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)
 
Posts: 27589 | Location: Where tech companies are trying to control you and brainwash you. | Registered: 29 April 2005Reply With Quote
One of Us
Picture of boom stick
posted Hide Post
I see the belted 444 BOSS being a hit. Short action thumper.



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)
 
Posts: 27589 | Location: Where tech companies are trying to control you and brainwash you. | Registered: 29 April 2005Reply With Quote
  Powered by Social Strata Page 1 2  
 


Copyright December 1997-2023 Accuratereloading.com


Visit our on-line store for AR Memorabilia