2ndtimer: That would be interesting to see for sure.
I could run some of the already made 52 grain handloads I have through my chronograph being shot from the 26" barrel that they were made for - BUT - the barrel on this VTR (the rifled part of the barrel!) is only 20" long so poor comparison there.
To much room for guessing at the loss per inch and the like.
I don't know if I will be able to get a comparison to satisfy our curiousity because I do not have any other 223's with 20" barrels.
Hold into the wind
VarmintGuy