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Originally posted by Bwana-be:
Anyone heard of a cartridge with a .530" or .532" rim AND base size?
In other words, Take the H&H case, turn the belt off, blow out to size of rim.
I'm thinking it would be a great way to compromise mag cap with powder room, now that so many are on the "beltless bandwagon." (Not to mention the "Law of Diminishing Returns bangwagon.")
Basically, the way A-Square took the dimension of the Weatherby and made the Pegasus and Excaliber.
Could the Ultra be full-length resized to this extreme? Seems if it were, the brass would end up being so thick as to negate any powder capacity advantage over the original belted, but maybe not.

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Originally posted by jeffeosso:

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this is the remingtion ultra mag... which is the 404 jeffery... a-square is the 416 rigby case, which roy weatherby added a belt to to get the 378 case.

you could, in theory, take the 338 rum, trim to 2.5, and have the ability to gain a couple grains.

cheers
jeffe[/QB][/QUOTE]
RUM is quite a bit bigger than the H&H.
.550/.532 vs .464/.532 (or .530)
The quest is for a nonrebated, nonbelted, fullsize magnum case, which would look like this:
.532/.532/2.85
As for trimming to 2.5, that's already been done by Dakota.

I think I may have found a close contender, though.
The Rigby 350 has a base/rim of .519/.525 and a length of 2.75".
Now, if that case could be had, and could take being blown out to .525" at the base, then minimal taper to neck, say to around .5" then you'd have what I'm talking about.
Seat a .358 cal, 310 gr bullet out to 3.6" or so, and load it up to about 2700 fps and call it a day.

quote:

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Originally posted by Bwana-be:
Thanks all, for the replies.
Mostly just thinking of how to maximize that powder room without changing boltface or mag cap. The belt takes up space that could be used in a blown-out config.

Paul, as far as why not to use the 404 case, well, I don't have a good reason. I just like trying to come up with something new, then seeing if it's useful enough to try to pull off.
Don't know if the Ultra cases could take being swaged down that much, and the point is to have max interior; not sure just where the brass would end up.

My pet project is a .358 cal, and seems the blown-out H&H case (a la STA or 358-8mmRem) is plenty big, maybe a bit beyond need, which is how I prefer.
I'll end up with the STA, as I keep coming back to it, and I'm sure I'll love it.
(But there's gotta be a cat out there waiting for my name to be put on it!)

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As a 35 nut I understand. So far I've only played with 38 sp, 357 mag, 357 Max, 357 Herret, 35 whelen AI and the 350 Rigby. I still want to try a 358 win, 350 rem mag, and while I figure the 350 Rigby is all I need, I keep getting the urge to build a 358 STA.

Honestly, after dealing with fireforming 35 whelen ai brass, forming 350 Rigby brass, and forking over serious coin for 500 Jeffrey brass, I'd like to have something that uses factory brass, or is very easily formed. I think the 358 STA is a winner for a hot 35, you won't gain much with a bigger case, and I just don't see the benefit of spending the $ for custom reamers and dies, or going through masochistic manuvers to make brass. In hindsight, a 358 Norma would have likely been a better choice then the 350 Rigby, though it wouldn't have cleaned up the throat in my barrel.