Hummmm.

Not sure if we are all talking about the same thing here , that's why I asked Bonanza the question. His post seems to indicate that you can get a rifle to regulate ie both barrels shooting to same point of aim with a different weight of head and different charge, but with a lower POI. Yes that I can see and is no different to re-regulating an old double.

However what I cant get my head around is using a lighter weight head and less velocity for a practice load and getting it to shoot to the same POI as the full house loads, shoot together yes but the same POI??. My experience with pistols and BA rifles suggests that it cannot be done. And If you drive the lighter head faster to raise the POI then you end up with the same recoil or worse because of a faster recoil pulse.

Regards