The main point is the OP is asking for an ELK load in a Omega 50cal 1-28 twist rifle. That pretty much makes a PRB about the worst option on the table regardless of laws. The twist and rifling depth are not well suited for PRB and probably wont shoot them well with anything hotter than a plinker load.
The rifle and twist though have a good potential to shoot full bore bullets if the QLA is not poorly machined. They also have more than adequate energy for hunting elk.
