Like many of us have had issues with CZ barrels not able to utilize load data from standard manuals due to the tight throats, which do not allow use of OALs listed. Have three such pistols and found a solution using a Manson reamer. The cost of the reamer was like $40. Have now modified all 4 of my pistols with no damage to the reamer. None of the pistols took more than 3 turns to accomplish the task. You do have to heavily oil both the reamer and the barrel during the process. My results have been excellent, with no loss of accuracy and in one case a significant increase in accuracy.
My purpose in doing this was to ensure safety with my children, who might grab the wrong ammo and create a issue by forcing the slide closed. Yes, I have one of those children, sadly I used to be one.
Bottom line is it does work, and the barrels were not damaged and unusable. Think the total time it took for even the first one was less than 15 min. No pressure was required and very little metal was removed. I did clean and check with each complete turn. It would be very easy to take off too much, so caution must be taken. I used a dummy cartridge that used a bullet that had caused issues, but was dead on OAL listed (XTP 124 gr). After it would pass the plunk test, I made one more full turn to provide for a margin of safety.
Have put at least 100 rounds through each of the pistols with no issues and all remain 10 ring accurate. Amazing as the one pistol was not so when I started. Also have noticed an increase in velocity in two of the pistols and have not tested the other two.
Hope this helps others who have similar problems. Best wishes.
JW
