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Posted: 12/30/2012 6:15:15 AM EDT
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First off, I would like to thank everyone for all the information available here. I have learned so much.
I am getting ready to set up my Hornady resizing die using once fired LC brass, and thought that I would check some commercially loaded, unfired rounds, in my Wilson case gauge. When I drop in a new Remington cartridge, it is below the lowest land by a couple of thousandths. I can't really get a good measurement, but there is movement between when the cartridge is seated against the gauge, and when I push it up against a straight edge placed across the lowest land. When I place a Gunn re-manufactured cartridge into the gauge, it is in between the lands of the gauge, just like the instructions say it should be. I only have experience using Dillon gauges, and want to be sure I am setting things up correctly. I find it difficult to believe Remington doesn't size their cases properly, but the 60 cases I checked are out of spec, according to my gauge. All of the Gunn cartridges are spot on. Any thoughts or comments? Thanks, HD714 |
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My thought is that most factory ammo will be like this, but having never gauged any, can't say for sure. Factory ammo needs to fit any minimum dimension chamber that might be out there while at the same time the factory is not concerned about any wear or stretching on the brass in regards to future reloading. So they size the cases on the small side to ensure they will chamber.
Going forward use your case gauge to verify proper resizing. With the Gunn ammo they have probably set their resizing using a case gauge and you are seeing that when you check that ammo. |
 Set your sizing die so the end of the case is between the steps. Factory rounds gauge low, but their goal is to fit in any firearm of the caliber. As handloaders, we custom tune our ammo. Check out the 300 blk master thread, it's on page 2 at the moment. One thing about Wilson gauges, keep it oiled, it's not SS like the Dillon's, it will rust.
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