I bought a Masterpiece arms 9mm with fake can. It was a purchase just "in case"
I got to playing with it and found that I can load 1.3 gr of Win 231 under the Lee 125 RNFP boolit and it cycles fine. It is a hoot to shoot and 'bump fire'.
That load wont cycle my other 9mm's so I color the primers to keep them separate.
Surprisingly accurate if aimed and have no problems hitting a B-27 @ 80 yrds