Pulling PRB:
In the process of breaking in new M/L instructors, they express a "slight" fear of experiencing a Dry-Ball. We purposely create this point of "Murphy's Law and Dry-Ball a round. Thank God for pure lead as it's very forgiving and the ball is extracted with slight effort, using a screw-jag. ... ..
SABOTS;
I have to admit that I have never tried "pushing" a Sabot but have extracted a number f them, using the same screw-jag and they actually pull easier than PRB.
Possible problem:
By pushing a Sabot, it's possible that the petals/skirts are working against you. When I pull a Sabot, I'm pulling on the projectile and dragging the Sabot. Kind of like pushing a rope....
Be Safe !!!