I've been on GT for a few years and this is the first time I looked at the reloading forum, and this thread is interesting to me. I loaded up some 110gr JHP's over BD and have had signs of excessive pressure in my GP100 - like very difficult extraction and flattened primers. They seem OK in my Contender OTT .357 Mag barrel though.
I shot max loads of BD under 158 JSP's when my GP100 was the only thing that I had to shoot silhouettes with. These seemed fine.