First off there is NO SAAMI standard for .380 +P. It is an attachment some people arbitrarily attach to an ammunition label that means little. Anyone who markets .380 +P ammo is NOT a SAAMI member.
To get higher velocities with any ammo you must either exceed standard pressures of lighten the projectile (or both).
Not sure what you are asking. Is it safe to shoot a few of these listed rounds through your BG? Probably. Excessive pressures WILL lead to accellerated wear and MAY cause blown cases and damaged guns.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball