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Posted: 6/27/2012 5:00:54 AM EDT
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loading for 556 i have noticed a HUGE difference in how different brands of once fired brass resize.
this has caused me to only buy once fired military brass as it is 99% of the time all the same brand. what i do not understand is that the resizing process is the same, on a single stage, yet one brass can resize within spec and another be under-spec and another over spec(only happens with different brands of brass). I assume this is due to different brass thicknesses and hardness? |
| Another reason for the difference in sizing effort might be due to the chamber dimension of the firearm that the cartridge was fired in. For example, a cartridge fired in a tight chambered .223 match barrel will likely not expand as much as a round fired in a 5.56 military chamber. |
| Not all cartridge brass is the same composition, so it is all going to be a little different. I've even noticed the changes over the years from the same manufacturer.... a perfect example is Federal .223 brass from the last 8 ( ? ) years ago... it was too thin in the primer webbing. That stuff resized wonderfully for me... but would get loose primer pockets after one or two heavy loadings. |
| The only brand case I notice that requires more effort to resize is Prvi Partizan, PPU. The only brass I segregate for short line use is PMP b/c it is much heavier. I also remove "large letter) (older thin-webbed) Federal, S&B, and anything Chinese from the reloading pile. Those get scrapped. |
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In my experience this type of thing is more noticeable with rifle brass , pretty much you don't see it with pistol stuff.
Before I ever started loading for the AR I had stacked up a pretty good sized supply of brass so the simple solutition was to sort by headstamp/brand and to deal with one type of brass at a time. only brand of brass I have ever reloaded is lake city With pistol brass there are a couple odd brands that cause problems and if I notice I just scrap them but other than that it all goes into or comes out of one bucket for each caliber |
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