That is a question we get quite often around here and we always throw a question back to a customer. People call or show up wanting us to give them advice but there are a lot of liabilities in telling people what to get or do. So much of gun accessories and firearms has to do with the job at hand and a persons gun skills. I’ve heard people claim that you can’t shoot long range with a 5.56 gun but I see it done all the time at local gun clubs. Sure there are instances of high wind where a 5.56 bullet isn’t going to do very well, but sometimes only a 50 bmg is going to get the job done.
Even the trusty and reliable Mini 14 is an often over looked hunting Carbine, but I’ve seen white tails taken up in Vermont with 75gr expanding rounds. The 6.8SPC would be a more powerful round than what the military is using today but it’s not really going to solve all of your problems. Most of my friends that own them are using them for hunting rounds and not even for Carbine training ect. The only problem you may run into when changing uppers in with the gun magazines. The 5.56 round is better than any handgun round if you use the right kind of ammunition and the AR15 platform gives you lots of caliber options that are really best for upgrading your gun for better hunting.