Mealman, my concern would be whether your 1911 Parker,especially in the light "0" frame was up to a diet of the pressures Kent Tungsten matrix shells generate and the old wood up to the recoil stresses. And, whether the gun is suited to 2 3/4" shells. If the Parker is in fact a 1911 dated gun it should probably have 2 9/16" chambers and would have originally been built for lower operating pressures than those we currently find in commercial shells made in the USA. Might be cheaper to get yourself an inexpensive beater like a used Rem 870 as a duck gun specialist and feed it whatever you like.