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Commercial versions of the bowling ball mortar are available from a couple of sources. Check out the ads on sturmgewehr.com. There are some available there now, I think.
Met a park police Lt. who told me that as a youth, he was part of a "Union" mortar crew that re-enacted for the public. Instead of the two or less ounces of powder they normally used, they, while inebriated, poured in a pound. Now, we're talking about 20 pound mortar round and not a can o' baked beans. Well, the report was pleasing enough and the ball sailed into the air like it was designed to - and out of sight. Opps.
They formed a skirmish line and marched forward in the direction of the ball. About a mile later, they found it and happily enough, no car or person was beneath it. The poor sober soljers got a royal chewing out from the Park Ranger for that stunt but they knew they deserved it.
Anyone in San Bruno CA should swing by Tabor Engineering. Frank Tabor has one for bowling balls and while not pretty, it works. He once demolished a tree with it.
When the Doc wrote he was 'downrange' to get the next photo, I think he meant he was on the other side of the firingline. Wish he did take photos of the impacts too.
What they need to do is set up ten pins down range and shoot for a strike.
From my limited knowledge, they use a cut-off ox-acetelene tank mounted on an "X/Y"/motar mount.
Drilled to accept a standard percussion cap & use some amount of black powder as the charge. You pull a string & the cap takes the whole thing off & away - basically a percussion muzzle loader - just at a higher elevation.
Betcha Bill ll (w/4 Ls) could fill y'all in some..... he's made some things.
BBWs shoot a standard bowling ball about 500 yds+ downrange & in fairly sodt dirt, you'll have to dig to rcover the shot.
Nighttimes, they'll fill the fingerholes with a "paste" that gives quite the nice tacer effect.
In any event, the spin of the ball always whistles like an SOB .... firing turns the ball into a dot in about one heartbeat.
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