cur_dog

Lead copper bullets tend to obturate in the sabot, asmall amount - especially thinner copper clad pistol bullets)as the charge is ignited. This action helps to insure that the bullet does not slip in the sabot and does add a bit of benefit in that the sabot will pushed up against the lands and groovesto aid in rotation. If you purchase Barnes bullet/sabots you will know what I mean at they fit the bore really tight to begin with, insuring that there is neither slippage in the sabot or slippage of the sabot across the lands and grooves.

I a recent discussion with Del Ramsey where I expressed aconcerned about loose fitting sabots - he enlightened me to this concept. He was less concerned about the sabot slipping by the riflings as his concern about the bullet slipping in the sabotfailing to get to rotaion speed for stabilization. The all copper bullets do not obturate and therefor could slip in a loose sabot.