Not only is it ecpected, a 10" bbl .223 just might surprise you... Mine did! I routinely get an inch, and when everything is clicking, it'll do 3/4-7/8", and that with a Burris 3X. I use 40, 45, &50gr bullets. I just can't get the velocity with 55 grainers, in ten inches, that I want. The 5ogr semipointed Sierras seem to work like a controlled-expansion rifle bullet, when used on larger game like 'yotes. I did find that mine likes the bullets close to, if not into, the leade. Try it! You'll Like it!