Many import guns come with instructions on loading powder by weight and not by volume, powder by weight comes out lower in grains than using a volume measure. If you are using a volume measure 20 to 25 grains is alright.
I don't think this is true...Pyrodex really threw a lot of confusion into things after it's per-volume data came out. Pyrodex NEEDS to be used on a VOLUME base...but true Black will cross from volume to scale weight to within +/- 1gr..
I have read inserts from the late 1800's loading info and they spoke of long range competitons and the huge importance of keeping loads weighed exact, and went so far as to list how much vertical stringing you should expect from just volume dumping and being out of semitry only one (1) grain of powder.
I once tested my little brass volume measure and found that, on my electronic scale, that the 25gr volume charge weighed right at 25gr of 3fff. Then to my real surprise I tested it with 4ffff and found that the 4f granulation was the same volume to weight as the 3fff. (Both Goex powders). I thought the 4ffff would weight more on a volume to weight but it does not differ from 2ff or 3fff enought to notice.
To the original question...your brasser is about as strong as the steel frame revolver, at least for the first few shots because the pressure is held by the exact same cylinder as the steel guns...you don't have to worry about it exploding in your face.
But to fully load the brasser will VERY QUICKLY destroy it by battering it apart...just stick with 15gr or a little more and you will be smiling down the sights of your brasser for many years. The occasoinal full load will most likely leave its mark on the frame, but won't result in shrapnel
