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Offline machinehead

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handgonne caliber
« on: May 16, 2005, 05:05:49 PM »
With all the talk about handgonnes it has got me wanting one.  This is a pic of the one i want to build.  

I will be using aluminum bronze full hard.  The original one came out to 17mm .669 which i believe is pretty close to .69.  A guy made an original one 17mm and when he fired it he patched the ball.  Are others patching theres?  To my understanding a .69 caliber bore is .69 and the ball is undersize to accommodate the patch.  So a ball for a .69 caliber may be .68.  When buying a mold, will a mold stated to be .69 caliber be undersize or right at .69.  As you can tell i've never messed with buying a musket ball mold.  How would a smooth bore instead of riffled bore effect my bore size if using patches?
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Offline Cat Whisperer

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handgonne caliber
« Reply #1 on: May 17, 2005, 01:23:23 AM »
THAT one caught my eye too.

Patching is a controversial issue with cannons.  If you do go that route, I would HIGHLY recommend that you have a VERY smooth bore.  Patching with round ball is generally done so the round ball will be twisted by the rifling.  It also increases pressure - that is the hair-raising part with home-built/designed shootin' irons.  Windage provides pressure reducing clearance - yet with all that pressure behind the ball you still get good velocity.

IF you patch, you will select the patching material to accomodate the clearance beteen the ball and the tube.  Different materials will give you a selection to choose from.

I use 3/4" copper tubing in mine - that makes the bore about .90 in diameter.  You could well use 1/2" tubing and the bore would be just above .625".  That also is just right for 20 gauge - so you could use shot cups for loading 20ga or slugs or round ball or ....
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Tim K                 www.GBOCANNONS.COM
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Offline machinehead

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handgonne caliber
« Reply #2 on: May 17, 2005, 07:17:38 PM »
20 ga does sound preaty good.  there is alot more avalible for .62 than .69.  it might even get me into a black powder shotgun.  this is going to turn into a expensive venture, like everything else.  this thing not being a sniper gonne i believe ill just ream it to .625 and call it a day.  the old indexing head will get a work out on this bad boy.  it would be alot simpler to just have straight walls but one is about 1.5d egrees and the other .68 degree.  oh well  i have to have somthing to take up my time.
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Offline Cat Whisperer

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handgonne caliber
« Reply #3 on: May 18, 2005, 01:20:28 AM »
Not to complicate things, but you could steel sleeve it with a section from a fully rifled 20 ga barrel.
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Tim K                 www.GBOCANNONS.COM
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Offline claypipe

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Re: handgonne caliber
« Reply #4 on: June 01, 2005, 12:56:13 AM »
Quote from: machinehead
With all the talk about handgonnes it has got me wanting one.  This is a pic of the one i want to build.  

I will be using aluminum bronze full hard.  The original one came out to 17mm .669 which i believe is pretty close to .69.  A guy made an original one 17mm and when he fired it he patched the ball.  Are others patching theres?  To my understanding a .69 caliber bore is .69 and the ball is undersize to accommodate the patch.  So a ball for a .69 caliber may be .68.  When buying a mold, will a mold stated to be .69 caliber be undersize or right at .69.  As you can tell i've never messed with buying a musket ball mold.  How would a smooth bore instead of riffled bore effect my bore size if using patches?


Another handgenade in the works. :roll: Doesn't anyone here know anything about metalurgy?  :eek:

Claypipe
Gonnemeister
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Offline Third_Rail

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handgonne caliber
« Reply #5 on: June 01, 2005, 03:20:17 AM »
What are you talking about? If you know so much about handgonnes, you'd know what he proposes is safe.
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Offline claypipe

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handgonne caliber
« Reply #6 on: June 01, 2005, 04:47:51 AM »
Quote from: Third_Rail
What are you talking about? If you know so much about handgonnes, you'd know what he proposes is safe.


No, not really, since I don't want to repeat myself, please refer to my post in this thread:
http://www.graybeardoutdoors.com/phpbb2/viewtopic.php?p=391204&sid=449dd525b0b57e0aa32a956cc9cc10f5#391204
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