Cannon Ball

How do I build (safe and legal)a tennis or golf ball cannon?

I want to know how to build a safe and legal cannon to shoot either tennis or golf balls.

Will high pressure pvc work?
Thanks.
what do I do?
I want to launch a small, non-lethal object a few hundred feet.

well No.1 there isn't any such thing as a legal cannon. Or potato gun. I have made several and nothing as it turns out is legal.I made several with schedule 40 PVC that have exploded in our faces. I am currently working on one that shoots T-Shirts into crowds for stage shows. I can't disclose those details yet. I am still in the final steps and it will be patented. I will however follow up on this at a later time. (nothing is safe that shoots) Please don't mess with this.

Very Old Civil War time Cannon Ball
Very Old Civil War time Cannon Ball
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CIVIL WAR ORIGINAL RELICS DUG EXPLODED ARTILLERY SHELLS or Cannonball Bullet
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CIVIL WAR ORIGINAL RELICS DUG EXPLODED ARTILLERY SHELLS or Cannonball Bullet
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AMERICAN REVOLUTIONARY REPLICA MINIATURE CANNON AND CANNON BALLS ON A BASE
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CAST IRON CANNON BALL 5 Antique CANNONBALL
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CIVIL WAR ORIGINAL RELICS DUG EXPLODED ARTILLERY SHELLS or Cannonball B
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CIVIL WAR ORIGINAL RELICS DUG EXPLODED ARTILLERY SHELLS or Cannonball Bullet
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8 lb CANNON BALL
8 lb CANNON BALL
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Civil War Cannon Ball Fragment east of Glorieta NM
Civil War Cannon Ball Fragment east of Glorieta NM
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Old Rare Vintage Antique Civil War Relic Confederate Cannonball 2 Grape Shot
Old Rare Vintage Antique Civil War Relic Confederate Cannonball 2 Grape Shot
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Vicksburg Civil War Dug relic CS Artillery 6lb Borman fused CannonBall
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Vicksburg Civil War Dug relic Artillery GENUINE CannonBall 6lb 367 inch
Vicksburg Civil War Dug relic Artillery GENUINE CannonBall 6lb 367 inch
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Civil War Dug relic LARGE Artillery CannonBall 13 inch Mortar Ball Fragment
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Vicksburg Civil War Dug relic Artillery CannonBall 2 inch
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Dug Civil War Artillery Relic 15 inch Cannonball Vicksburg
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CANNONBALL 10 lbs 4 CAST IRON CIVIL WAR PEACH TREE CREEK ATLANTA
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CIVIL WAR ORIGINAL RELICS DUG EXPLODED ARTILLERY SHELLS or Cannonball Bullet
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CIVIL WAR ORIGINAL RELICS DUG EXPLODED ARTILLERY SHELLS or Cannonball Bullet
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TEXAS 4 POUNDER CANNONBALL FOUND AT THE ALAMO IN 1860
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VTG 4 1 2 SOLID STEEL CAST IRON CANON BALL 14 LBS
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Cannon Balls and Cannon Shot
Cannon Balls and Cannon Shot
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BATTLE  SIEGE OF VICKSBURG MiSSiSSiPPi CIVIL WAR Cannon Ball With COA  DISPLAY
BATTLE SIEGE OF VICKSBURG MiSSiSSiPPi CIVIL WAR Cannon Ball With COA DISPLAY
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OLD BUILDING FIND 3 INCH CANNON BALL REPRODUCTION
OLD BUILDING FIND 3 INCH CANNON BALL REPRODUCTION
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Castiron Civilwar Cannon Ball 2 1 2wide Dug In Pa
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Castiron Civilwar Cannon Ball 3 wide Dug In Pa
Castiron Civilwar Cannon Ball 3 wide Dug In Pa
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Guaranteed authentic cannon ball
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Civil War CONFEDERATE Side Load Cannonball FUSE with Paper Intact Cedar Creek
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FUSE SECTION OF A 12 LB CANNON BALL CIVIL WAR RELIC
FUSE SECTION OF A 12 LB CANNON BALL CIVIL WAR RELIC
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CONFEDERATE 12 LB POLYGONAL CANNON BALL PIECE CIVIL WAR RELIC
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Borman Cannonball Fuse Glorieta Civil War Site New Mexico
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7in solid shot cannon ball from Fort Donelson area
7in solid shot cannon ball from Fort Donelson area
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Time Remaining: 4d 12h 26m

2 POUND CANNON BALL Original Civil War Era Cast Iron 25 Diameter Vtg Antique
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Time Remaining: 4d 14h

CIVIL WAR CANNON BALL
CIVIL WAR CANNON BALL
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Time Remaining: 4d 15h 3m

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Civil War 6 LB Solid shot Cannon Ball
Civil War 6 LB Solid shot Cannon Ball
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Time Remaining: 5d 4h 42m

4 pound cast steel ball May be cannon ballor shot putor mill media
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Original Canister Cannon Ball 1st Minnesota Monument Documented Gettysburg PA
Original Canister Cannon Ball 1st Minnesota Monument Documented Gettysburg PA
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Iron Cannonball Fragment Valverde Civil War Battlegound NM 3 4 thick
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Union Confederate Civil War Era Cast Iron Grapeshot Cannon Ball 2  susquhanna
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Civil War Artillery Relic 9 lb Cannon Ball w seam
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Civil War Canon Ball Shot fragments Fort Early Lynchburg VA 1A13
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Civil War Canister Shot Grape Shot or Small Cannonball Holder
Civil War Canister Shot Grape Shot or Small Cannonball Holder
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Original  Authentic CIVIL WAR or Earlier 9 Pound Cannon Ball 4
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CIVIL WAR UNION ARTILLERY 6 POUNDER CANNON BALL WITH BORMANN FUSE CORINTH MS
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Rare Crude Huge Antique Civil War Relic Canon Ball 2 Canister Shot Confederate
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ANTIQUE CIVIL WAR ERA CAST IRON CANNON BALL 2 INCH DIAMETER FROM ALTON IL
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Antique Heavy Civil War Era Cast Iron Grapeshot Cannon Ball 2 Inch Diameter
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Civil War Grapeshot Cannonball
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CIVIL WAR COFEDERATE ARTILLERY 6 POUNDER CANNON BALL WITH BORMANN FUSE
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