Here's an example of what I noted earlier in this thread...
The 22BR is noted above as an accurate .224 cartridge, but it gets credit for that accuracy because the case is short enough to allow the 0.190" free bore shown here. You need to understand that a long snug free bore is what aligns the long VLD bullet with the rifling and this is key to accuracy with VLDs. It also allows bullets to be seated longer which increases case capacity. Thereby allowing greater MV without pressure.
0.190" free bore is unheard of in the world of 223 Rem, but not for any good reason... tradition, stubbornness and close mindedness are the best reasons that come to mind. A 0.155" free bore is considered long for 223 but most are much shorter than that, but there no good reason for it.
Don't get hung up on the names of legendary cartridges. Instead, examine what characteristics of that stereotype are the reason they are legendary and apply that logic to the cartridge of your choice,
So my thinking was why not apply the winning characteristics of the 22BR to the 223? So I had a 223 reamer made with 0.190 free bore... It's not rocket science and any decent pipe fitter can spend a couple hundred bucks to do the same.
The most significant limitation to the 223 is that it is so often produced with actions that are too short that feed from mags that are too short. Its time to toss the SAAMI spec out the window and start configuring the 223 so it can actually perform at extended distances. The 223 needs to shake off the "training rifle" status it so often get tagged with.