you must be in some good prairie dog towns to be using a .223. Many years ago, we had "exclusive" use of a white mans ranch down in the middle of the Rosebud Rez in SD. We'd blast through 700 rounds in a 12 hour day and they'd still be running over each other. I even "regressed" to a 22 magnum as they were that close. He sold out and moved on. Then we had to hunt public lands etc and opening shots started at 500 yards. I moved up to 243's which were good to maybe 750 yds on a good day. I even have a 6.5 x .284 set up for 1000 yards. Last time I went was in 07. Got rained on for 6 our of 7 days in Gillette, WY. It is a LONG drive from Phoenix (about 1400 miles one way) I think my dogging days are over sadly. All my friends are getting old and crippled. Heck, one of em who is a good 20 years younger then me can't even shoot anymore!! Sad ENJOY it while you can!! I had about 8 good years of it out of about 13 years. Got rained out more then once. I better get off this topic. and now back to gun cleaning!!! I just use Hoppes number 9, and CLP and it's worked great for many years. Never any rust, and I used to live in MN with all that humidity.