FALSE! Are you quoting misinformation? Or, is that your personal theory, and interpretation? That goes for 7.62 LC, but is false, unsupported, often repeated, myth for 5.56. I would like to see your factual reference for that claim.5.56 brass is considered military brass and is thicker than regular commercial 223 brass. The internal dimensions are smaller on the 5.56 brass which causes higher pressures than the 223
Conjecture, interpretation, opinion.and are able to with stand the preasures the .223 have shorter leades which will increase the pressures in your chamber possibly causing catastrophic damage to you and firearm.
Actually you can, and many people do so.You can shoot 223 in a 5.56 rifle but not the other way around.
This assumes the components and assembly details are the same in each cartridge. That's not happening. Same thing with the 7.62 NATO vs. the 308 Win.The reason you can not shoot 5.56 in your 223 is that 5.56 brass is considered military brass and is thicker than regular commercial 223 brass. The internal dimensions are smaller on the 5.56 brass which causes higher pressures than the 223.
Best way to not void the warranty is to not shoot it. I don't know of any of the commercial manufacturers that will honor a warranty if you use reloads. I believe the principal danger is doing reloads near max charges without knowing what the possible reduced case capacity can do to your pressure--particularly if there's a risk of bullet set-back when chambered.I don't want to damage my rifle or void its' warranty.