Cannon Balls in Scale

Out of curiosity I looked up the the diameter of naval cannonballs by gun sizes, then calculated the size (in mm) of shot/BB/ball bearing to replicate that size cannonball. I only calculated for 1:96 scale because that's what I'm working in at the moment. If you would like to convert to a different scale, just divide the "Diameter (mm)" column by whatever your scale is.
BTW, I'm thinking these sizes might need to be adjusted down slightly to account for paint thickness in a model but I may be wrong.
GunDiameter (In)Diameter (mm)1/96
64-pounder7.55191.772.0
42-pounder6.84173.7361.8
36-pounder6.7170.181.8
32-pounder6.4162.561.7
24-pounder5.82147.8281.5
18-pounder5.3134.621.4
12-pounder4.62117.3481.2
9-pounder4.2106.681.1
6-pounder3.6793.2181.0
4-pounder3.281.280.8
3-pounder2.973.660.8
 
A friend shoots trap and skeet, and just happened to have steel shot in sizes very close to what I needed. Problem is, if you don't have a friend, you probably have to buy a pound of shot to get the gram or so you need.
Or a box ofshotgun shells (25 ea)
 
I think that if you went into a gun shop and told them that you need 2 grams of shot they would probably give it to you. Or go to a range after a shoot and drag around a magnet.
 
Gun Shop would be your best bet for proper size for the scale you are working on. Dragging or digging the ground at a gun range for your proper size would be very difficult. I used to shoot a 45 caliber flintlock pistol that I built years ago, and you really don't want the balls that size unless you are building very large ships.
 
Thanks, Greysteele for the useful iron cannonball size chart! I expanded it a bit using MS Excel and here are the results.

GunFull Size Diameter (In)Full Size Diameter (mm)1:96 Scale (mm)1:84 Scale (mm)1:75 Scale (mm)1:64 Scale (mm)1:48 Scale (mm)
64-pounder
7.55​
191.77​
2​
2.3​
2.6​
3​
4​
42-pounder
6.84​
173.736​
1.8​
2.1​
2.3​
2.7​
3.6​
36-pounder
6.7​
170.18​
1.8​
2​
2.3​
2.7​
3.5​
32-pounder
6.4​
162.56​
1.7​
1.9​
2.2​
2.5​
3.4​
24-pounder
5.82​
147.828​
1.5​
1.8​
2​
2.3​
3.1​
18-pounder
5.3​
134.62​
1.4​
1.6​
1.8​
2.1​
2.8​
12-pounder
4.62​
117.348​
1.2​
1.4​
1.6​
1.8​
2.4​
9-pounder
4.2​
106.68​
1.1​
1.3​
1.4​
1.7​
2.2​
6-pounder
3.67​
93.218​
1​
1.1​
1.2​
1.5​
1.9​
4-pounder
3.2​
81.28​
0.8​
1​
1.1​
1.3​
1.7​
3-pounder
2.9​
73.66​
0.8​
0.9​
1​
1.2​
1.5​
 

Attachments

  • Cannonball Size Calculator.xlsx
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Not that there's a big difference, but the tables I've used indicate diameters somewhat smaller than the above (not that you'd ever see it in scale). Just for additional reference:

British Cannonball Sizes

As specified in Borgard's Standardized Ordinance:

Mass of Cast Iron ball (lb)Diameter (in)
43.05
63.49
94.00
124.40
185.04
245.55
326.10
426.68

And of course the bore size of the cannon barrels were always larger, by 4%-5%, as noted by the above source. I think that may be where the tables posted previously came from (bore, rather than ball, diameter). Good article, though; you might want to check it out. An article on the same site shows the most accurate representation of Armstrong pattern barrels that I have found.
 
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