I've always had to use lookup tables or go to various web resources while working up loads and doing energy calculations for round ball, so a few weeks ago I started making a little app for myself to do that stuff. I think it also might be interesting to folks around here who do shot or PRB. I even put in a chart that calculates energy and drop using Stephen Wardlaw’s drag model - very similar to the one I've used at ctmuzzleloaders.com
This morning I put it up on the iOS App Store for a few bucks:
https://apps.apple.com/us/app/round-ball-shot-calculator/id6756200604I'm not asking anyone to buy this or anything right now... With an App Store listing, I can generate a limited number of free download codes. I'll just send you one if you PM me and want to check it out and provide feedback (I'm sure I haven't thought of everything). At the very least, it's pretty fun to mess around with.
Share and enjoy!
