that's great, that means you can shoot lead or coated and take it apart to clean it periodically. that will save you lots if you choose to go that route (lead or coated).
Palmetto makes a pretty cheap 203 gr coated bullet for the BLK. price depends on quantity. Order a small quant first to test.
I hear there are some chamber issues on some 300 BLKs....and I'd rec a Sheridan slot gauge for 300 BLK but be aware your chamber may not be in spec depending on where you got your rifle.
Coated bullets in this caliber is a bit temperamental, because they are sized up a bit. You need to bell the case a bit more than you would with jacketed. Order a small quantity and carefully determine your OAL etc.
the 300BlkTalk forum is a good resource, also, taking care to corroborate all the info I gleaned there...
C