I once did some experimenting with 9mm lengths....
I went through a large quantity of sized 9mm Luger cases. I found that the vast majority of them were shorter than the trim length. There were not enough of them that were longer to do a real accuracy test, so I bought a bunch of 9x21mm cases and cut them down to exactly the length they were supposed to be for the Luger round.
In accuracy tests between the trimmed ones and the random (shorter) ones, the ones trimmed to the exact length they were supposed to be had 25% to 1/3 smaller group sizes.
Unfortunately, I rapidly went through the trimmed ones, losing them in various ways, it was a lot of work and it was expensive, so I don't do that anymore.
Complete thread:
- Reloading -
Art,
2013-09-25, 19:18
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- JimT did an article - Paul, 2013-09-25, 19:58
- I usually trim the cases for semi-auto pistols once -
Hobie,
2013-09-25, 21:25
- I've been reloading since I was a little kid (literally) -
cas,
2013-09-25, 21:28
- I've been reloading since I was a little kid (literally) -
Lee J.,
2013-09-25, 21:53
- I've been reloading since I was a little kid (literally) - Art, 2013-09-26, 06:52
- I've been reloading since I was a little kid (literally) -
Lee J.,
2013-09-25, 21:53
- I usually trim the cases for semi-auto pistols once - Lee J., 2013-09-25, 21:34
- I've been reloading since I was a little kid (literally) -
cas,
2013-09-25, 21:28
- Reloading -
Lee J.,
2013-09-25, 21:25
- Reloading - Bud, 2013-09-26, 08:08
- Triming handgun cases - Charles, 2013-09-26, 10:46
- I've never trimmed a 9mmP case.... - JD, 2013-09-26, 14:35
- I once did some experimenting with 9mm lengths.... - Harry O-1, 2013-09-27, 07:51
- Been reloading for years . . . - Kentucky, 2013-09-27, 09:18