GB dia varies

[buzz36]

I bought 12 golf balls the other day to shot in my new canon and found 4 out of the 12 have a dia greater then 1.719 my barrel is at 1.70 the other 8 balls  micked at 1.67 to 1.69
I sure thought GB were  lot more common in size
well im going to make a ball sizer to test befor i go to the range next time
 

[ironball]

Most cannon makers use 1.750 for golf ball diameter, just for that reason.

[GGaskill]

The Rules of Golf specify only a minimum diameter for a golf ball (Wikipedia reference); competition between manufacturers for the "longest ball" keeps them as close to minimum as possible.  Since the minimum diameter by rule is 1.680", I would be surprised to find them much larger than that.  Certainly one .040" larger would be a surprise.  Was that box a box of practice rejects?

There are a number of diameters used for bores.  I use 1.719" (1 23/32").  The 1/40 rule would be 1.723" (43.76mm) which is not a standard drill diameter.

[buzz36]

yeah my sample ball was 1.68 so i made my bore 1.70
im going to hone my bore a little anyway  as teh tooling marks seem little rough and see were i end up
the balls i have were to be  pro  recycleds?? Im not a golfer and have no idea about anyone who is

[Artilleryman]

Buzz36, You probably already know this, but a good way to gage your projectiles is to have a tube that has the same ID as the bore and about 3 calibers long to roll your projectiles through to see if they are "fit" to use.

[jamesfrom180]

I believe my barrel is 1.75" and the retrieved balls I have fired all show a 3/8" "drag line" or band where it appears the ball deformed and was in intimate contact with the bore.  I would suspect that when using a golf ball as a projectile the deformation of the ball is alot greater than most cannon projectiles.

[Double D]

Check the reference sticky the there is information there giving the official specifications for a golf bals

[Cat Whisperer]

We've always recommended the 1.723" dia. here.  I've made a bunch at 1.75 but they need a bit of patching.  Even at the 1.72 diameter there will be an occasional ball or two that are TIGHT.

I picked up 5 gallons of them at 5 cents each at a yard sale once, so I don't bother picking some of them up.