That would be the reason for me to get another upper. One in 6.8 would be more appropriate for hunting. Buy I like the M&P Sport for the price.
The S&W Sport is an excellent rifle, I do own one and can say from experience it is reliable and very accurate. It does not have a FA or dust cover so if you fel you need them then look at a different rifle. The Sport has 5R rifling with a 1 in 8 twist and it melonite treated. Mine shoots under 1 inch all day long at 100 yds with American Eagle ammo and my hand loads. Many groups are 1/2 to 3/4 size.