OK, the Swift is rimmed with base diameter 0.447. Has anyone done anything on this case in terms of catting? Mainly interested in those that perhaps shorten it a hair. Looking at making a rimless variant by using 6.5x52 Carcano brass that I have in excess ....

There is a 17 SWIFT ; JDJones has a 6.5mm minidreadnought on the Swift case; I don't know if either of these is shortened.

the_captn

JD Jones has a 6.5 Dreadnaught on the Swift case. Sean

One of the first 6mm's that I saw was the 240 Cobra. I think it is a Swift necked up.

The 220 Weatherby Rocket is/was(?) basically an Improved Swift.
You could shorten it to make something very close to PPC brass to fit a .473 boltface...........

Marty,my lone sample of the .220 Swift mikes .4415".Clymer's prints for the .220 Swift and the .240

Cobra lists a base dia.for the reamers of .445.The base dia.of the 6.5x52 is listed at .451".



I don't know what the reamer specs.are on the .257 and 6.5 Mini Dreadnaughts are but they are about .090 longer than the 6.5x52 case.



All my 6.5x52 and 7.35 Carcano mike between .4467-.4471.



You could short chamber any of he wildcats built on the

standard .303 Br. case,not the Improveds.



WC

My recollection is that the .220 Swift case is not much changed from the 6mm Lee Navy case (the parent case?). So when Guns and Ammo needed 6mm Lee Navy cases to fire in an original rifle, they made them from .220 Swift cases. Does that count?

The 6mm Lee Navy{.236 Lee Navy} was the parent case for the
.220 Swift,the rim dia. was increased to fit the standard Mauser bolt face.

The .220 Swift can and has been used to form 7.62x39,7.62x45,6.5x50 Jap,6.5x52,6.5x54 MS,and 7.35 Carcano
however though useable,it is less than ideal for most of them.

For the 6.5 Carcano to be used for a rimless version of a wildcat based on a shortened .220 case the 6.5 Carcano base would need to be swaged or turned about .005.

The 6.5 Carcano could be used for the .276 Petersen or a
rimless 6.5x50 Jap.

WC

As I write this, I'm having an 8mm barrel built using the 220 Swift case. It's for my contender and I'm calling it the 320 Swift. Hopefully it'll be finished by the end of the month or beginning of next month. I've also considered making a 416 (420 Swift?)for my contender.
I was told the you can't use the swift case in a contender only the encore--we'll see.

RAS323,

It would be dangerous to chamber a Contender in .220 Swift
because the Swift is loaded to pressures that are too high for the Contenders design.If the .220 was loaded to levels
suitable for the Contender frame you could safely use it,but if a factory loaded Swift were fired in it,there could be dire consequences.

There is no reason the case could not be safely used in the Contender for a wildcat as long as you held the pressure to a safe level.

WC

.257 Dart (Swifts cut to 1.90" and expanded to .257"...similar to the .250 Savage)

.401 Bobcat (Swifts cut to 1.40" and necked to hold 10mm bullets).

Lee Martin
www.singleactions.com

Lee -

Looks like we think a lot a like ... your 458 Devastator (or was it the Bone Crusher) is VERY close to my 458 SOCOM, but I went the rimless route. Heck, depending on when you did the conversion, I could have loaned you the dies, reamer, etc. Figure you can cut the recess for the rim ;o)

Tell me more about the Dart, what is the overall loaded length? It might fit the bill nicely. Any chance the tooling (dies, reamer, etc) might be available?

Thanks!

Marty....my .458 Devastator is a little shorter than your .458 SOCOM (case length = 1.40"). I designed and built the round way back in 1994 and have only worked with it in 5-shot Ruger Blackhawks. The .257 Dart is very (and I stress "very") close to a .250 Savage. There's an article on my website that provides a history of the round and case dimensions (I didn't design the Dart, but had worked with it in benchrest guns for a few years).

Lee Martin
www.singleactions.com