No replacement for displacement........but if the transmission, drive line , ring and pinion , axle shaft , wheel , wheel studs , splines , or tires won't hold it ......
In our case (pun) if the barrel won't burn it all it's a waste . You gotta have that other 4-6" otherwise you should have gone with a 280 or 7-08" in the short barrel .
Thoughts nobody ever mentions.
If you have a 24" barrel for a 300 Sav , 308 , 7.65A ,7.7 J , 06 , 300WM , and a 30/378 Weatherby, it will be not only 2" more than the Sav or 308 needs for apex velocity but functionally a half inch longer with the Sav and 308 than the 06' and 300 WM both of which are a 1/4 shorter than the x55/57/58 . The 30/378 loses another half inch to the 06' .
20" 308 clan , 22" Mauser/06' , 24" for WM/RM , and 26" for the RUM/Weatherby.
The 6" of additional barrel over the 308 is really only about 5.
One of the things that makes the WSM and 284 lines the wonder cartridges that they are isn't all in the short fat case . Part of it comes from the other 1/2" of useful barrel over the 06' performance in the same length of barrel .
Dad loved his M12 with the 32" barrel at the range there was little to no MV difference between it and my preferred 26" BPS . No doubt the longer forcing cone and slower choke played a roll in the BPS . The 28" OU is a full 3" shorter than the BPS and almost dwarfed by the M12 ....... It's faster than either with less muzzle flash than the BPS . The theory is that 28" is very close to powder apex length in 12 ga with 2-3/4" 1-1/16 to 1-1/8 oz loads . I'm sure the 32" would shine with real 3" mags under 1-1/4 oz .