I recently posted that my 223 Ultra 1:9 didn't care for BT bullets. Well yesterday it found one it liked. 55 grain HPBTs Seirra, and these where bullets I pulled with an inertia puller because my wife said they kicked too much in her 22-250. These bullets also had a "waist" around the shank from the Lee Factory crimp die. I almost pitched them but decided to reload these for my 223 and figured I would plink clay pidgeons with them at a later date.
Yesterday I took the 55 grain seirras to the range and shot a couple of 3/4" group @ 100 yards, which is pretty much the best shooting I am capable of with this or any other gun.
I then let the gun cool and fired a 3 shot group at a 200 yard target and got a 1.45" group @ 200 yards. This gun has the factory trigger which it probably why most of my groups spread more left to right than up and down.
I made up for a good 223 group by then shooting a miserable 45/120 group, almost 10" @ 200 yards.
After shooting the 3 shot 223 group @ 200 yards, I fired a fourth round by the "Free Recoil" method. It grouped the same left to right but the POI was several inches higher, it is the hole near the top of the target a little to the right. I normally shoot my 35 cal and down handis by holding the front of the receiver at the pivot pin with my left thumb and index finger. On the free recoil 223 shot my left hand was not on the rifle.
BB