large vs. small flash holes.

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large vs. small flash holes.

Post by james r chapman on Thu Aug 13, 2015 11:58 am

I've noticed a large variation in primer flash holes in my mixed brass.

anyone experiment with what's the better choice.

I know when I'm making up .32 s&w blanks for my son, I have to drill the holes larger to limit primer set back.

any opinions out there?

Jim C

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Re: large vs. small flash holes.

Post by Rob Kovach on Thu Aug 13, 2015 12:09 pm

There was an old thread about this a year or 2 ago...

Some people said it's a big deal so I tested it out with my machine rest.

I usually get just under 3" groups with my mixed brass 200gr LSWC loads over 3.8gr BE.
I dug out 5 Winchester cases with large holes and 5 Winchester cases with the small holes and shot those as a group.  It came out just under 3" and I couldn't tell which holes were from which flash holes.
I then dug out all different headstamps looking for different flash hole sizes and other anomalies.  I grabbed a couple split cases and loaded 10 of those.
It came up to be a 3" group....nothing noteworthy.  I had a helper watching in the scope when I let the split cases fly---he said they went right through the middle of the group.

.45ACP is very forgiving...I wouldn't worry too much about brass unless you always hold 9 ring or better on the long line.

Rob Kovach
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Re: large vs. small flash holes.

Post by james r chapman on Thu Aug 13, 2015 12:23 pm

OH, I hold there, the shots just don't go there, lol

thanks for the answer...

I'll just make sure the holes are open then...

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Re: large vs. small flash holes.

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