Some cartridges were just born near perfect and are hard to improve on. The 308 is practically the same thing as 30/06 in GI load. Just shorted to adapt to shorter weapons and functions better in automatic weapons. There
would have been no 308 if the 300Savage would have filled this roll. The 222Rem would have been the govts cartridge for the M16 if the neck wasn't so long, a draw back in auto weapons. That's how we ended up with 223
after they experimented with 222mag. I can't get excited over many of the new cartridges. If you get a wildcat
book you will see that just about every thing has been necked down, blown out, cut off, ect. Most are not better or worse, just different. Many of them duplicate others performance in a different brass. The biggest thing that
changed in last 50yrs is the new powders.