5.56 NATO (outsides) 223 REM (inside) NATO case lengths appox. 1mm longer, do not have mic so I cannot tell the exact dimensions.
hmmm, so this would cause a big problem while reloading? you would have to cut the 5.56 down the mm to get it to the .223 lenght? This is a great post, please elaberate, since Im really debating getting a bullet press etc, and .223 will be one of the calibers that I will be making. Thanks
The case wall is thicker and the primer pocket differs as well, I believe. But if you have a 5.56 chamber, you can fire either, so just reload it to the case's specs.
you reload you'll be checking case length on all your empties, trim them to specs called out in your loading manuel for the caliber you have.
They gotta fit into the hole :<)
A few bucks worth of tools and you will be ready to go http://leeprecision.com/xcart/Case-Trimming-Tools/
I use the trimming tool on all shot brass as it is also a case length gauge so it won't cut if not needed, why take the chance of rounds being out of spec.? It's hard to rectify once the bullet is seated. I would head to the auto parts store and pick up one of those $20 digital calipers to make sure that your final product is within spec. I don't like guess work when it comes to re-loads, sometimes seating dies mysteriously get out of adjustment so it's a good tool to have on hand....imho
if it really goes in a bad direction!
I meant I wouldn't trim the 5.56 to .223 specs. You could do it, and make a round whose external dimensions match the .223, but I would caution that the charge shouldn't exceed the .223 specs. The 5.56 is capable of higher charges. But if you have a rifle that can chamber NATO, I would stick with that on the original brass.
I always load to .223 spec. since only two of my three rifles can chamber NATO, no sense in the risk of an ammo mix up and somebody getting hurt or killed.
Hmm, good point I didn't think of. Yeah, best to back it down. You can always back it down. Least common denominator is best.