So I worked on my CZ quite a bit to get it feeding properly. Not an expert but a fair amount of analyses of the action. I actually changed mine to Lott recently because the Win Mag works through tighter angles to get into the chamber so I think the Lott is more reliable feeding wise. The camming action that you talk about is normal. By the time the front of the bullet is in the chamber, the magazine springs job is all but done. The round cams up off the feed ramp and chamber mouth and slides up the bolt face. If it hangs up there, it is likely to be three possibilities. The bolt face is not smooth, the claw extractor is not smooth or the little rim around the top of the bolt face is not smooth. These three surfaces will work if you run the bolt vigorously but I was amazed at how much easier that little part of feeding smoothed up when I polished these surfaces. The bullet actually forces itself under the extractor and you can polish off the corner to make it slip under more easily. But it is a fine line, that tension is what makes it a controlled feed, to much space and the cartridge is not held, too much tension and rough edges and you have rough and hard feeding. I marked the contact points on this pic of my CZ 550 bolt. Also check the bolt face is smooth. If there is a bump or rough surface on those key points, it will make that lttle bit of the load cycle feel harder. With the different angles of the Lott, it may even hang up as the rim slips under the claw. I took the claw off and polished those 3 surfaces with 600 grit paper. I was amazed how much easier it made the loading. Or just shoot 500 rounds and it will wear smooth.
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