Doesnt seem so, it has just taken a long time to get CTA in service,(some of) the ammunitions have been around for quite a while.
would really help if we could knew the orgin of this graph
also do you have any idea what the milne-deMarre is on top ?
look like a formula name to me but cant really find anything truly correct for this but a formula for the propagation of the light.
and if it was the Jacob deMarre formula ( wich i doubt since we some other characters that wouldnt be correct in it ( 9<k<13) ) it would mean that it’s graph for the theoretical pen
Potentially industry has its own models which are close to real life, and they extrapolated known penetration tests.
Chances are also that the graph presented above is from that older penetrator weighing around 250g and being shorter than in service round.
