Not sure of the Contender either, don't have one, YET
From the articles I have read the Grendel has a pressure of 42,000 psi . It was made to fire in AR 15's/ M16s so the pressure had to be under 45,000 for the 5.56 action.
Have been reading where some shooters are getting more pressure though in bolt guns when hand loading. With the high B.C. I think some shooters for pistols will like it.
The dies for the Grendel is $48.50 from Lee. Guessing you could get some "custom" dies from Hornady also but have not looked into yet.