Mate you have most bases covered, it is however, nice to fill the gaps too, which your .243 did nicely. I’d grab another .243 if you liked the cartridge or maybe try something in 6.5mm. Grendel is a lot of fun mate, CZ make a nice one in the 527.
I love my Creedmoor too, but be prepared to cop a shellacking if you end up with one.