Quote Originally Posted by Jerry R View Post
Actually, with moly coated bullets, we had zero signs of pressure. Normal extraction, no flat primers, no smudges around the primers. Bore just ahead of the chamber still looks factory fresh. We took 1K each of 75gr 243 and 55gr 223. Worked the close mounds (out to around 400 yards) with the 223 - or until we shot 100 rounds, then swabbed the bore, put it in the cleaning cradle and ran the 243 until either 100 rounds or distance exceeded our abilities. Then we either finished the cleaning and swapped calibers again, or moved the setup to another location.
Pressure doesn't really burn out barrels, but could be defined as a contributing factor to higher velocities. Pressure is more important to accuracy and preventing catastrophic failure. Heat dude, lots of heat from high velocities is what eats up barrels. I'm with Former11B, and if you keep running them that hot you'll burn those barrels out at <1K rounds.