Handy loading tips...(might not all be applicable right off the bat...but when you end up with multiple AEGs/etc...it might be helpfull)
1. Put your bag of BBs into a much larger ziploc bag...keeps the loss of BBs due to spills and oopsies to a minimum. Anyone who has tipped over their bag of BBs while loading can appreciate this. OR...if you just load at a table between skirmishes....dump them all into a rubbermaid/kitchenaid tub. Lable it with the brand and weight of BB...or write it on a piece of paper and toss it into the baggie.
2. Get a loader for each brand/weight of BB....if you go between indoor and outdoor alot and use different weight BBs for different rifles (i.e. my PTW loves 0.30's and my gas rifle prefers 0.28's)...then having a loader for each is really convenient....lable it with a sticker. If you're big baggie (see above) is large enough...you can just toss your loader into the baggie and then the loader and BBs are always together and readily at hand.
3. Tuck a spare little loader into your kit bag or spare stuff box...it'll be handy in a pinch...for you or for some dummy that forgets his on game day and wants to "borrow" a loader...you may never see that loader again, and I guarantee you'll never see the BBs that were in it again
4. If you're using a loading rod (clear tube with a plunging stick)...just wrap a piece of tape around 30 rounds, 100 rnds, etc...It'll make it really easy to load mags to specific capacities when you want to do that. Jamming more BBs into a mag than it's supposed to take is a great way to smush the springs in them...and they'll get weak and not feed well. Loading tubes are great for reloading grenades.
5. Empty your mags completely after games when you're packing your stuff away. Dump the BBs from the mag into the big baggie (not the small one since you're going to spill it and then all your BBs are rolling around on the floor
)...then dump 'em back into the small baggie when you're done. It's also a good way to check that you haven't gotten a lot of grit, sand, crap into your mags/BBs...you can clean them off before you dump them back into your little baggie of pristine BBs.
6. Get a feel for how many BBs your loader will spit out with each press. Mine does 4 pretty reliably...sometimes 3 if I don't give it a shake every now and then. So 25 presses = 100rnds...8 presses = 32. If a game is ammo limited (say 300rnds total), but not real cap...then I'll just do each mag to 25 presses and take 3 mags out at a time. If a game is real cap...I'll just do each mag 8 presses. Some might get the full 32...some might get 28-29...doesn't really matter in the end.
And....I suppose a little bottle of BBs is technically a loader...if you're using a HiCap mag! LOL