Dunno about DoubleTap ammo, have never tried it.
However, I have verified for myself (and posted in other threads in this forum) that some standard pressure ammo has higher speeds out of my BHP and Kahr than some +P rounds, so wouldn't be surprised if some +Ps go faster than some +P+s. The +P designation refers to pressure, not velocity. You would think higher pressure would equal higher velocity, but 'taint always so.
elb
However, I have verified for myself (and posted in other threads in this forum) that some standard pressure ammo has higher speeds out of my BHP and Kahr than some +P rounds, so wouldn't be surprised if some +Ps go faster than some +P+s. The +P designation refers to pressure, not velocity. You would think higher pressure would equal higher velocity, but 'taint always so.
elb