Pellet sorting - help needed - not what you think.

I do not know how I did this unless on a Friday after some relaxing after work beverages, but I found out as I was trying to load a mag with what I thought was 15.9gr pellets. Some would fit and really wouldn't. Started inspecting and it appears I mixed a tin of 18.13 in with a tin of 15.9. Grrrr......

Aside from one at a time, does anyone have suggestions at sorting this mess of mixed pellets out?
 
@ctshooter I’ve accidentally mixed .30 and .25 pellets. It was pretty easy to eyeball them and separate them by hand just looking at them side by side, even in a group within my palm. I simply picked out the larger looking pellets. One group was also noticeably shinier than the other so that helped too. If the pellets you mixed up are really similar to the point where you can’t eyeball them by size, see if there is a color difference. If not, the next best thing I can think to do is weigh them and separate them. Sorry man. I wish I knew of an easier way. 
 
One at a time is the only way I can think of but if you want to make it interesting you could rig up a balance with something like a popsicle stick.

With one of the lighter pellets stuck to one end of the stick you could hang the other end over a cup.

Placing a heavier pellet on the empty end would make it tip and let the heavy pellet fall in the cup. A lighter pellet would balance and could be placed in a different cup.

It's over-engineered but it might not be boring.
 
Why suffer through a manual sort? Find a neighbor with chickens, train them to sort without eating the pellets. You'll have to outfit them with beak guards so they don't get lead poisoning. Or maybe they can do it with their feet? Give them a reward for every tin of sorted pellets they scratch out. Then train them to sort by head size and weight; and also clean and lube (assuming that's your bag...). Would make a nice business. Maybe partner with PA, AoA to add it as a service option with each pellet order.

Capture it all on video of course, Youtube airgun genre is running low on entertainment value lately.
 
If you look in the back of them it's plain they are different so at least you don't have to weigh them. I poured a half tin of each together once myself. Shot some pretty horrible groups till I figured out what I had done. Then yup poured them out on the table and sorted them out one by one. My groups got way better after all of that.

EDIT;

https://www.airgunnation.com/topic/really-screwed-up-sorting/?referrer=1