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Posted: 6/4/2014 5:19:34 PM EDT
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resized a huge lot of 9mm nato brass today, I had my die (hornady) set up from an old range brass lot.
I did not check them with a case gauge till after I was done (brain fart).... 90% of the brass drops below the lower step in my lyman case gauge.... I am not sure how the 9mm case gauge works, Does this mean the brass is just short? or does this mean I sized it too much and am screwed now? |
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I just played with the die some, they are coming out below the lower step even if the die has a gap between the shell plate. I'm going to guess the case gauge is more like a go or no go setup.
It indexes off the case seating rim correct? so guess these are just short cases. |
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you could also load a couple dummy rounds with no primer or powder and see how well they chamber and extract from your gun.
I just checked a bunch of mine with a Dillon case gauge and they are all just a hair below the top edge. If you get a lot of light primer strikes in test firing, then the cases could be too short, but I've never run into that before with 9mm. I think you're ok |
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The 9mm headspaces on the case mouth. I would guess the Dillon gage checks the trim length?? In other words, you dont want the case head above the gauge. But most 9mm brass will never need trimming. Dillon PISTOL case gages do not have the steps
mentioned in the rifle gage section. The pistol gage is used to determine overall length and case diameter. Designed to maximum SAAMI cartridge length and minimum chamber diameter. OAL is achieved by seating the bullet to the proper depth at station three of your loading machine. Insert a completed round into the gage and set it on a clean, flat surface. If the bullet extends from the top of the gage, the round is too long. To seat the bullet deeper into the case, adjust your seating die down in 1/8 turn increments until the proper OAL is achieved. |
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Pistol Case Gages are a "go/no-go" gage for a loaded round. Or in other words, if a loaded round drops all the way into the Case Gage, it will fit in your handgun's chamber.
Dillon's Stainless Steel Case Gages are made to SAMMI minimum chamber dimensions and are accurate to within plus or minus .001" - which allows you to quickly check all critical dimensions of your loaded ammunition, including maximum overall cartridge length and base diameter. |
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gotcha, so by the bullet dropping below the lower step its just showing the round is semi short. long as its not above the higher step should be good to go.
I play with my rifle dies to keep it between the steps to make sure I am not over sizing the rifle brass. Figured pistol would be the same. Learn something new every day here. |
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