Recently I purchased a CZ 527 American chambered in .22 Hornet. It's a beautiful rifle but after shooting about 150 rounds of factory ammo (single feeding rounds into the chamber as is standard practice when shooting for accuracy) I was wholly unimpressed with the rifles performance. Blaming the poor accuracy I decided to work up some hand loads. Using the fire formed brass I neck sized the cases, uniformed the flash holes and trimmed all cases to the exact same length. I then weighed each case, bullet, and powder charge and separated them into 5 round matches lots. I also made sure to seat the bullet .002" off of the lans. All said and done the loaded rounds were all within .0005" In length from ogive to case head and all matched lots weighed within .05 grains of each other. Happy with my workmanship I headed to the range. The rifle performed better than it had but wouldn't throw a 5 round pattern under 4" @ 100yards. Hardly acceptable in my book. A bit disappointed I loaded up the 5 round mag and figured I'd just plink off what I had left and consider dumping the rifle. To my surprise the first 4 rounds, when fed from the mag, all grouped under 0.35" @100 yards, the fifth round (now with an empty mag) threw about 1" outside the group. I shot 3 more groups with similar results. I figured maybe the rifle had just settled in so I shot 3 groups, now single feeding them as before, and again the rifle wouldn't pattern under 4" @100 yards. Switched back to feeding from the mag, 4 rounds in one hole last round flier. I can't figure out what is casing the rifle to do this! It's driving me insane lol. Anyone had this kind of problem before and found possible remedies or have ideas as to a possible cause?