You don't need to buy those expensive bullets. Get a 1000 pack of Speer 50 grain TNT bullets. They are excellent, and will cost around $85. I have used a variety of bullets on PDs and the TNTs are as good as any, and better than most. Expansion on varmints is explosive.
That said, the TNTs are made for velocities under about 3,500fps. Speer makes a different bullet for higher velocities.
If you must have a 55 grain boattail bullet at a low price, then see what Remington and others have available. Again, premium bullets don't make a lot of sense for this application.