thanks for the input, mine is making one big hole with 50s and 55s, awesome gun. wanted to try the 75s that I bought a couple of years ago for the mini and ar, but wont feed. hoping to use them in the new cz, guess it's time to experiment and find out myself. I''m sure I can get em stable, by getting them to 2700fps+ but wonder how long before they tumble. My goal is 400yds, I'll let keep ya posted. JR