RE: 100 gr. verse 150 gr.
Jeff,
based on what I've seen with my Knight in-line, I would say the 50gr increase in powder should raise the bullet up to 3 inches.
However, I would also expect your accuracy to drop fairly drastically with that charge. With a fast twist barrel, it is easy to over-spin lighter bullets and sent then flying into places you don't want them to go. My gun's max charge is 120gr and I reserve that load for 400gr PR sabots; 350gr sabots get between 100 & 110gr; 300gr sabots get around 90gr; and any bullet smaller than that gets used as a fishing weight because my gun just don't like 'em.
"Every moving thing that liveth, I give unto you as meat" (Gen 9:3)
Trust God..........but keep your powder dry!