Does anyone know of any good plinking bullets for a Searcy Classic in 500 NE. Looking for something cheap that will still shoot well (paper) and be safe in DR bbls.

I saw these at Midway;

http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=636982

The same company offers 300gr, 450gr and 550 gr bullets in FN and RN. Any comments?