Nipple wrench and some spare nipples. If thats the cva hawken, it uses the 6-1mm thread. i likme the hollowbase spitfire nipple that cabelas sells.

i'll be shooting mine later on this evening too. You should also get some of lanes powder tubes to hold your powder charges/ projectiles.
http://thepowerbeltforum.powerguild....tubes-t395.htm

Best money you will spend.

check over the rifle and make sure the tang screw it tight, check all the screws for tightness before ever attempting to load. Remove the nipple and lube it a bit and inspect inside the drum for a blocked flamed channel, debris, and look especially for any worn or broken threads on both the nipple and the drum.