.50/.30 type 7 (SALVO SQUEEZE BORE)

New member here (First post!)
I found a cartridge at a local gun show this weekend - item #5 in the picture. The seller was asking $100 for it. He told me it was an experimental round that was dropped because the "plastic around the darts left a deposit inside the barrel of the gun. I was hopeful that some of you might be able to provide more insight and let me know if it’s worth the money. He told me he had a letter explaining the history behind the round but the show was winding down and he was putting things away. The show will be back in a few months.

Chip, nice selection you got there.
Though these are not related to flechettes (arrow shaped projectiles) but these are squeeze bore cartridges “only”.

.50 BMG SALVO Squeezebore! Fun stuff. The premise was that five stacked copper cones (140 gr. each) would be fired from one casing. The barrel would taper or at the end of the barrel there would be an attachment that would continue the bore, but tapered from .50 caliber to .30 caliber. This would cause the projectiles to shed their wrapping and stagger while increasing pressure and velocity.

Other posters like Lew can give you details that would be more better.
Diagram showing projectiles being squeezed and separating

Picture of barrel with unfired cartridge, stacked projectiles, single projectile, and fired projectile

Diagram of squeezebore in the 9/30 pistol variant

Diagram showing barrels

Three types shown. The left is your example while the right is type 10

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The picture (above) is just something I found on the internet. Not part of my collection (sorry for the confusion).

So what I am seeing in bullet #5, the part that LOOKS like fleschette’s are really ribs on one of several projectiles contained in the cartridge?

The seller claimed a value of $250 but he was selling for $100. Any idea if this is a fair price (contingent on condition of coarse).


Right, the skirts of the projectiles in yours are knurled.

As for pricing, Last I saw the Type 10s were $25/ea for pristine examples. I don’t know about Type 5s.

I picked my example up for $20 CDN, but has black grease all over it… it isn’t the best example I’ve seen, but it is good enough for me.

Welcome Chop

The most valuable ones would be #4 it your introductory photo, BUT ONLY if the bullets are magnetic, as those were the 1st variation. If not, its a common variation. So other than the 1st or an inert / dummy round these mostly trade in the 15-25 dollar range.

These type designations {on the .50’s) are not a formal military designation but one that Ron Fuch’s devised for collectors to easily describe the type of projectile in trades & such.

Also all of these have WW II headstamps and as such the headstamp is not much of a consideration as to a variation.

Think that is my photo of the three bullet variations.

Dave your variation with the black grease is I think excess asphalt-type case mouth sealant, & to me, a valid variation

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Pete thank you for that information! I will log that in my notes. I feel better about my particular cartridge now!


Gentlemen… This gun show is back in town this weekend and I was going to take another look at the .50/.30 Type 7 cartridge if the seller still has it.

Can you guy’s give me any idea of what a good price would be? I understand that it depends on condition but the seller was asking $100 and was hoping to find out if that’s fair.

Thanks for your help.

Chop…Pepper here…“rare” for cartridges is sometimes more circumstantial than “by the book”. At a lot/most gun shows, any cartridges that don’t fall in to normal gun/shooting/hunting circles becomes described as “rare” (many times noted to be “experimental”, etc…) This is done with no ill intent but from shear ignorance (not a bad word)…add in a tricolor tipped Israeli 50 and the adjectives can go crazy :)

I’m off my soap box.

I will say that several of the .50 SALVO/squeezebore/multi-ball variants can be found at “cartridge shows” (I speak for US shows). I would say with certainty that every year several variants are at the annual SLICS show and can be found in the $5-$20 range. I have never encountered a $100 variant, let alone a $250 example!

So if circumstances are such that this opportunity is “right”…“beauty is then in the eye of the beholder” and the money is judgmental.

I believe the most valuable (what I paid) example in my collection is the far left with a thicker more opaque white sabot than similar sabots (I have it marked $35…assumed my purchase price).

The sectioned examples are Paul Smith’s work and the x-rays I took at my work.

You know us cartridge nuts…if a sabot is more or less thick/long/dark shows more/less of one of the projos…it’s a “variant” :)

I will look at my trade stock in the mean time.

Enjoy our fraternity, the Forum and especially buying/trading/being gifted examples that strike your fancy.!

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Thanks Pepper.

From earlier discussions on the thread, it seemed that the asking price was obviously high. I was hoping to get a number that I could counter with that was fair and not simply a low ball offer (although the seller might interpret it as such).

My interest in this round is simply that I haven’t collected any of them yet.

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For what it’s worth, I have a couple of variations of the type 7 rounds in my collection. I paid $12 for one at a cartridge show in 2009, and $32 for the other at an auction in 2010. I personally wouldn’t go much over $25-30 for one of these.

“My interest in this round is simply that I haven’t collected any of them yet”

Sounds like you caught the sickness 😁

That funny. I work in the fireworks industry and we have a saying directed at newcomers. They get done with a show and say WOW, THAT WAS GREAT!!! We say… “He has smelled the smoke!”

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There’s a belt full of them for sale on Gunbroker for $12.50 each round, so…

(do a search for squeezebore)