ppkheat

Yes it did. We studied and compared the .45 vs 9mm strike very carefully. The 9mm caused a bit more damage and impression. Feeling behind the impact points, the 9mm left a noticeable ding in the cast, it actually bulged it back maybe 1/16" from flat, at about 3" diameter. The .45 didn't push it back at all in the same manner.

This was only a one-shot-of-each-caliber comparison. To be more conclusive I'd have to shoot this test multiple times to see if a pattern emerges.

If and when I get the chance, I'll try to repeat it and see if that pattern does emerge. Provided I have enough undamaged tub left?

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CopperKnight

Very good. Sounds like a lot of fun. At least the son-in-law was smart enough to stay behind the gun.

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Tangle

I hear ya on the one shot thing. My instructor at Blackwater said that in all the penetration tests and demos he'd seen since he'd been at Blackwater, the 9mm was unsurpassed in penetration for the major handgun rounds, i.e. 9mm .357 sig, .40, .45ACP.

So I'm really curious to see the results if you have enough tub left to do some more tests!

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pgrass101

I heard that 9mm FMJ is second in penertration to 7.62x25 of all major combat loads

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jackdog

Nice pics good post

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Supertac45

I know AP does a job of destroying cast iron.

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Sig Man
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PatrioticRick

Good read and good pics. 9mm & 45acp like to see more on that.

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nn

Sounded like fun.
Are you starting the PPKHEAT of truth?

dr_cmg

I would like to see what .357SIG and 10mm would do. I wonder if the porcelain coating is helping the tub to withstand the shots. I don't know how the porcelain is applied, but doesn't the surface it is put on have to be prepared. In the two tubs we have (neither is double wall) the outside appears to have been left in the rough, but the inside where the porcelain is looks like it was smoothed. This is real apparent around the holes for faucets, etc. Isn't the porcelain coating fired after being placed on the cast iron? If so, does this act as a heat treating of the iron and does the bonding of the porcelain increase the strength of the iron?

Just wondering why the tub doesn't act like other cast iron.

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George

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P95Carry

George ... AFAIK the process of enamelling will not change the cast iron's metallurgical properties -- by its very nature it will always be brittle and I'd not think the thin layer of glass would significantly ''strengthen'' the whole thing - not anyways when it comes to localized impact.

The one thing which I see as a variable is the presence of voids - a variable depending on the nature of the iron's original inclusions (how ''clean") .... and then the quaility of the casting process.

Good cast iron would probably take more punishment than poor examples - where size and quantity of voids could embrittle it further ... enabling major stress lines.

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