Are you using MAC/PC or mobile device? I only use the App on computer. If I read your question correctly:
You've got the .30 cal 44.75g JSB shooting 955 FPS which equals 95 FPE.
and you want to know how many FPS the 50g pellets will produce without changing anything
According to Chairgun; the .30 cal 50g will shoot 926 FPS for 95 FPE also.
Holy crap Fred. Are you sure your Bobcat is shooting 955 FPS? Thats a bit more than average.