My conversion resulted from a mate giving me an action followed by another friend giving me a .30 caliber target barrel which allegedly was worn out. I used a D bit to cut the chamber, threaded and thinned down the barrel . Shortened it to about 18" and bushed the firing pin hole to prevent the primer extruding into it which sometimes happens with Martini Cadet conversions. This results in the action jamming shut as the breechblock cannot lower with primer metal protruding into the firing pin hole.
Developing loads for a Cadet conversion is fairly easy. The action is a very strong little number let down by a lack of mechanical advantage in the extraction process. Knowing this ,I began by using an Australian powder AR 2207 which is about equivalent to IMR 4198 . I kept upping the charge , commencing at about 13 grains , until cases began to stick . Ended up using 16.5 grains of 2207 behind a 160 grain GC cast boolit for a velocity of 1650 fps as measured by the chrony.
Best group so far at 100 yds is 1.5"
Heath
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