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MoJo wrote:NATO spec ammo is loaded to a higher pressure than American +P ammo.

9mm NATO is not loaded higher than +P

The SAAMI pressure limit for the 9×19mm Parabellum is set at 241.32 MPa (35,001 psi) piezo pressure.[20]
The SAAMI pressure limit for the 9×19 mm Parabellum +P is set at 265.45 MPa (38,500 psi) piezo pressure.

The service pressure Pmax of the 9 mm NATO is rated at 252 MPa (36,500 psi) where C.I.P. rates the 9 mm Luger PTmax somewhat lower at 235 MPa (34,100 psi).

From http://en.wikipedia.org/wiki/9%C3%9719mm_Parabellum" onclick="window.open(this.href);return false;

Though, the "For use in submachine guns" would concern me slightly. Many reports of excessive pressure and extremely hard primers.