I just use the clear plastic 100 round boxes that people trash. Take the label off, re label and put the bulk ammo in while watching TV. Drives my wife crazy cause I am so slow, she grabs them and "files them in minutes" (I plan it that way)
Slide the cover back and dispense 10 at a time.
"Hints from Heloise"
OH, buy new ammo. Not worth the hassle and possible damage and I am cheap! Thrifty.