From above link:

" Finding a suitable sub-base for the popular .50 caliber is relatively easy. For the past couple of years, a number of Savage Model 10ML II shooters have simply been cutting the gas seal from the rear of a 28-gauge Winchester "AA" plastic shotgun wad, then loading just this cup over the powder charge. The sabot and bullet are then seated right down on top of this. The arrangement works very well, allowing these shooters to maintain great accuracy even when the weather turns hot."

Hmmmmm....wonder how well the home-made 28-gauge sub-base would perform when shooting conicals. Could this base replace using acouple of Wonder Wads? Is there a need to purchase the MMP sub-bases at all with this easy option available??

Time to pick up some AA 28-gauge wads and hit the range!!