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Longshot4 · January 15, 2016, 08:25 PM

About these 45 ACP Winchester cases. I don't think I explained the difference well. Since I cant send a Picture I will try to take some measurements. I took my basic DeWalt twist drill bit box with 29 bits from 1/16, 5/64, 3/32, 7/64, 1/8...

The smaller flash hole (standard size) is 5/64"
The seat or flat surface around the hole is very close to 5/64"<

The unusually large flash hole size is 1/8" witch if my calculations are correct is 3/64 larger than the standard flash holes.
The seat of flat surface around that hole is some thing less than 1/16" I'm guessing 3/64".

With what I have this is the best I can do.

January 15, 2016, 08:25 PM	#14
Longshot4 Senior Member Join Date: February 22, 2014 Posts: 868	About these 45 ACP Winchester cases. I don't think I explained the difference well. Since I cant send a Picture I will try to take some measurements. I took my basic DeWalt twist drill bit box with 29 bits from 1/16, 5/64, 3/32, 7/64, 1/8... The smaller flash hole (standard size) is 5/64" The seat or flat surface around the hole is very close to 5/64"< The unusually large flash hole size is 1/8" witch if my calculations are correct is 3/64 larger than the standard flash holes. The seat of flat surface around that hole is some thing less than 1/16" I'm guessing 3/64". With what I have this is the best I can do.