Originally Posted by
rjtfroggy
The 5.56 case is a military chambering, the cases are thicker and I believe develope more pressure than the civilian 223 chambering.
When reloading these cases the primer pocket needs to be reamed out so that a primer can be put in and the load needs to be adjusted because there isn't enough room for the powder charge with out compressing the load.
Most modern or up to date newer guns can probably handle the extra pressure but the "liability Lawyers" are looking to make a score on the end users who hurt themselves.
I believe the same warning goes along with the 7.62 and the 308 cartridge swaps.
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