Perfect reply! we tend to all think in the same way. To date my CZ550 22-250 has 4400 rnds down the tube, been hot enough to brand cattle and still does .50 5 shot groups, yes it slowed 150 fps. When I see keyholes its new barrel time. My other 22-250 was built in 1951 purchased used and zero idea of round count .25 is normal grouping for this one, 30 inch barrel means 3850 fps with a 50grn Nosler Ballistic tip over CFE ,223, Lapua brass, Federal 210M primers.