This definition appears very rarely
See other definitions of BP
Samples in periodicals archive:
Primer removal and bullet pull Handloading, Reloading, and Bullet Casting
Hero teachers: Women jump in front of bullet, pull fire alarm to alert others in theater shooting
If you use anything less than +P in one of those revolvers, you risk potential bullet pull (usually in the 4th to 5th rounds) sufficient to lodge a bullet far enough...