Punch size for different diameters

[Sparkitoff]

I'm curious is anyone is punching their own cards with a "store bought" punch (that was not intended as a shotgun punch). I'd like a 12, 13 and 24 gauge punch but I can't decide what fraction of an inch or millimeter diameter to get. My 12-gauge is exactly .730 (but I don't know the equivalent fraction of inch, the 13-gauge is 18.3 (so I guess I need an 18mm) and the 24-gauges both measure .575. Maybe something like a Harbor Freight punch kit? I see punches with just single and double digit #'s, like 8,9,10,11, 12... Not sure what to get.

 

[Trev]

I think that if you multiply the decimal by the denominator that you want to use that your result will be the numerator.
0.730 x 8= 5.84 so 5.84/8 is the fraction or 0.730" x 32 = 23.36 which I would round to 23/32"
"13-gauge is 18.3" ?
0.585" x 64 = 37.44 or ~ 37/64" or ~19/32" or about 9/16'

I think your 13ga might be about 45.44/64 or ~11/16
eta- I think cards are a bit oversize aren't they? You may want to round up a bit, Idk

 

[Jappo]

I might have to do the same thing. I ordered some op wads for what I thought was 16 gauge. .672" Well they were about a couple hairs too small.

 

[smoothshooter]

I'm curious is anyone is punching their own cards with a "store bought" punch (that was not intended as a shotgun punch). I'd like a 12, 13 and 24 gauge punch but I can't decide what fraction of an inch or millimeter diameter to get. My 12-gauge is exactly .730 (but I don't know the equivalent fraction of inch, the 13-gauge is 18.3 (so I guess I need an 18mm) and the 24-gauges both measure .575. Maybe something like a Harbor Freight punch kit? I see punches with just single and double digit #'s, like 8,9,10,11, 12... Not sure what to get.

I would just buy a set and surely one or more will be the right size.
Even though I avoid buying Chinese stuff at every opportunity, I made an exception and one of their punch sets. One of them was the right size for my immediate needs, and I have since found a use for a couple of the others.

 

[Trev]

The math is so easy - 0.250 x 4 = 1 so 1/4 to check the work 1/4=0.25 even by long division. 0.5 x 4 = 2 so 2/4 or 1/2

 

[smoothshooter]

I'm curious is anyone is punching their own cards with a "store bought" punch (that was not intended as a shotgun punch). I'd like a 12, 13 and 24 gauge punch but I can't decide what fraction of an inch or millimeter diameter to get. My 12-gauge is exactly .730 (but I don't know the equivalent fraction of inch, the 13-gauge is 18.3 (so I guess I need an 18mm) and the 24-gauges both measure .575. Maybe something like a Harbor Freight punch kit? I see punches with just single and double digit #'s, like 8,9,10,11, 12... Not sure what to get.

I believe Dixie Gun Works has a selection of quality arched punches that are identified by gauge.

 

[bud in pa]

I use EMT tubing from Lowes. I just check the inside diameter, cut it to length and grind a sharp angle on the outside.

 

[FlaminCrow]

Most of those would probably do best with a metric. For ex.
12ga = .700, multiply your decimal by 25.4.
.700 x 25.4 = 17.78mm.
18mm would probably be a good seal.

 

[The Crisco Kid]

Anyone with a lathe can make any size punch you want.

 

[FlaminCrow]

Number punches generally are standard number gages unless metric is designated.

 

[Trev]

Harbor Freight punch kit?

This what HF has at my store- 3/32 in., 1/8 in., 5/32 in., 3/16 in., 1/4 in., 5/16 in., 3/8 in., 7/16 in., 1/2 in. $8 but not shotgun size

 

[The Crisco Kid]

Check out Circle Fly wads. They come in quite a few different sizes and are around $11 per 1000. Log Cabin sells them.

 

[WALT53]

This what HF has at my store- 3/32 in., 1/8 in., 5/32 in., 3/16 in., 1/4 in., 5/16 in., 3/8 in., 7/16 in., 1/2 in. $8 but not shotgun size

9 16/ is 54 cal 5/8 is 20 g also we’ll work for 24 g and 3/4 for 12 g and 7/8 for 10 ga and that’s it I think for standard punch sizes . There was a gentleman on here who was making punches to size maybe it was Ohio ram rod not sure sorry .