My Ultra 223 took some time to break in and I shot it in with many rounds...and some frusteration
Ditto on the break in required for the .223 barrels. On my first outing with my .223 I was frustrated to the point of giving up on it. It would group a few fairly tight, then throw a flyer regardless of the load.
I've put about 200 rounds through it now. Before taking it out yesterday I gave the barrel a good cleaning with copper solvent then followed with typical bore cleaner. I was also trying a new load which used the 50 grain Remington PSP over 25 grains of H4895, commercial cases and CCI BR primers. The flyer situation seems to be eliminated.
Like many others, I've learned that Handi's are very sensitive to how they're placed on the shooting rest. I've also learned that they have to be handled with an easy hand when shooting from a rest.
My .223 is really starting to demonstrate consistency now. I still have to work on my benchrest technique for this rifle,... and some more load development is going to be in the works,.. but from yesterday's performance I'm convinced that 1 MOA is attainable with my Handi.
I have several other rifles of various types which I've been working with for a while, but this little, basic breakdown single shot is proving to be the most enjoyable that I've experimented with in a long time.
There's just something very satisfying about it's elemental simplicity.