I gave a trio of CZ 527s in 7.62x39. My first shot so well, that I couldn't bring myself to spin the barrel off. I have a Walther 6.5mm barrel and a reamer, waiting for rifle #2, and haven't decided what to do with rifle #3 (yet). If you need to borrow a reamer, let me know.
RL-7 is the powder for the 7.62x39mm from my perspective, offering both accuaracy and speed.
26.7 RL-7
150 gr.Sierra .311"
R-P Case
7 1/2 Primer
2208 fps
28.0 RL-7
130 gr.Norma SP .310"
R-P Case
7 1/2 Primer
2341 fps
John in Oregon
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