Ballistic Swiss (Army) Knife
GRT
Gordon’s Reloading Tool is neat but in limbo after the dev suddenly died. There is a team trying to reverse engineer it and make progress but no published progress after a couple years. The latest available version is from 2021.
BSK
The Ballistic Swiss Knife is a web-based tool by Jozef Remeň in Slovakia. IMO it is already as useful as GRT and is in active development. The author is receptive to feedback and fixes bugs quickly. Everything is exportable and many things importable.
I’ve started moving my handload development to BSK from GRT, and I encourage you to try it, too.
Srsly: do not take my word (or anyone else’s) on matters of reloading. Get some manuals, start with light charges and work up, etc. You are responsible for your own loads as I am mine.
Also see the BSK reloading calculator announced in this reddit thread.