About what level would 500 red chins get me to from 57 ranged at bandits?

0, dont waste your time.

skeletons in ape atoll is a much more efficient place to train range with chins, but you also must buy prayer pots. Its a bit more dangerous there as well, so look up guides on youtube to know exactly what you need to know and what to bring

OMG, thats stupid really...Is just a waste of money with your level at bandits, make 80 range and then start to chinning...

waste of time and money

I'm not going to say its a waste, since it really isnt, but you shouldnt use red chinchompas until around 80 ranged. Grey at 70 at the least, these are proven to be the best times to start chinning at minimum.