Daryl, I think you make a very valid point about the potential impact on accuracy.

In the case I mentioned, if the card disc 'wad' was to remain adhered to the base of the projectile after it exits the bore, accuracy may well fall away. Equally, of course, if the base of the projectile is being cut by gas, accuracy will almost certainly go south. How you resolve this dilemma I really don't know. In some cases it may be a case of just selecting the lesser of two evils - whatever that may be in your particular case.

There is a somewhat similar problem with paper patched projectiles. I'm a huge PP bullet fan (it just seems like such an beautifully elegant solution to leading - and PP bullets look so cool) but, there is always the potential for a portion of the patch, or more precisely, the twisted tail section of the patch, to stick to the base of the projectile after it exits the muzzle. Trimming the tail from the patch can help BUT it also greatly increases the potential for 'patch slip' while loading a M/Ler.

Life, as they say, was never meant to be easy............