The box…
left to right
Prometheus 6.1 gr, JSB Diablo Exact Heavy 10.34gr, H&N Silver Point 11.57gr, FX 13.4gr (JSB Exact Monster copy)
I had 3 types of the Prometheus pellets. One was in a green box just like this one and the other was in a round “bottle” about the size of a 35mm film container. Green container pellets had a tip with a meplat, the other one was a little shorter than the one shown and a smaller insert head.
Some other bullets for comparison, Beeman and H&N pellets in the pellet group now. Hornady 17 cal 20gr Ballistic tip, 22 cal 55gr cast, FX 25 cal, Hornady 6.5 120gr ELDM, 9mm 127gr cast, .358 200gr cast, 44mag 250gr cast, .452 235gr cast with GC, .458 500gr cast