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Posted: 7/25/2017 10:28:17 PM EDT
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So I have that Hornady Small Primer Pocket reamer, and Hornady Primer Pocket uniformer.
I decided to take one case and make a test, I attached the Primer Pocket Reamer to the cordless drill and started processing it, for some reason I noticed there was no "natural stop" in other words, I kept the drill rotating for 3 seconds and the pocket seemed to be reamed, however, if I continue holding it even for 30 (!) seconds, I still see the brass dust coming out...so my conclusion is, the more I keep holding it the more I will be taking off the brass? dryflash3, I just remember you confirmed there should be some natural stop with that tool, but from what I see now the more I do it the more dust comes out? Picture attached 
In that case, my question is: 1) did I over-ream it? 2) how do I really know when to stop? Maybe just give it a quick 1.5 second "touch" and done? How to feel it ? I guess same would apply to the primer pocket uniformer from Hornady which I attach to drill, although, there I see less brass dust coming out... |
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The stop is the end of the reamer. It's there.
Ensure you insert reamer plumb  (straight) into the primer pocket. Did you also uniform that case in the pic? You do need to verify the depth the uniformer cuts with your caliper. Use the end of the caliper where the shaft sticks out. Go to page 36 at this SAAMI Link for primer pocket depth. |
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I did uniform that case in a pic.
ok page 36 of that spec says depth should be 117-123 mils. it was kinda hard to make that measurement, but here is how I roughly made it, looks like 121 mils, looks legit? 
Also, do I first ream and then uniform? Or Uniform and then Ream? |
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ok i think i measure same, 121 mils, i also did measurement by taking the whole length of the device and the whole length without protruding part and took difference which equals 121 as well, so I guess my depth of uniformer is 121 mils.
so do I uniform first now? and then do reaming? or the other way around? |
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Quoted:
Ream first, then uniform. If the primer pocket has a crimp the uniformer tool might not even fit until it has been reamed or swaged. The Hornady reamer will cut until the blunt end reaches down to the depth of the primer pocket. If the primer pocket depth isn't uniform, the amount of chamfer the Hornady reamer cuts will also lack uniformity. I like my decrimped brass to be cut as consistently as possible, so I use Hornady's pocket uniformer first (adjusted to SAAMI), and then use the Hornady reamer afterward. |
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Quoted:
I did uniform that case in a pic. ok page 36 of that spec says depth should be 117-123 mils. it was kinda hard to make that measurement, but here is how I roughly made it, looks like 121 mils, looks legit? http://i.imgur.com/i6vTRJF.jpg Also, do I first ream and then uniform? Or Uniform and then Ream? Don't measure the reamer. Your doing it wrong. Measure a uniformed primer pocket. Stand end of caliper (opposite end from the jaws) on end of case, extend the shaft that protrudes into the primer pocket. Look at measurement. Done. |
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Quoted:
I'm going to have to disagree. The Hornady reamer will cut until the blunt end reaches down to the depth of the primer pocket. If the primer pocket depth isn't uniform, the amount of chamfer the Hornady reamer cuts will also lack uniformity. I like my decrimped brass to be cut as consistently as possible, so I use Hornady's pocket uniformer first (adjusted to SAAMI), and then use the Hornady reamer afterward. So it's best to ream first, the tiny amount the uniformer removes from the bottom of the primer pocket doesn't matter to crimp removal. |
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Quoted:
and if i measured above or below SAAMI spec, how do I adjust that uniformer? I see there is a bolt which I can take out, but I don't think I can adjust how deep it uniforms? Or do I press the cutter somehow? I couldn't press it 1. Lock the calipers to the depth needed. 2. Push the cutter squarely onto the base of the caliper. 3. Slightly loosen the set-screw on the uniformer, then allow the step measuring portion of the caliper to move the stop to the dimension required. 4. Carefully lock the set-screw. 5. Measure the amount of cutter exposed beyond the stop, and repeat and say bad words as necessary until it's perfect. |
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