25-18 gr Sounds good to me, I don't want the Brasser to be a powerhouse as I have the steel frames for that. I just ike the look of the full circle Brass Frame on the imitation '58. Sometimes I just pick up my Brass Framed Navy Model and admire it, cause it DOES look good!
I actually shoot the Brass Navy Model quite a bit but I do it with 20gr and below. It operates really smooth. I think the Brass Fraqme acts like a bearing surface for the internals.