Not much more than a few suggestions from me here, but I really want to hear from others on this.
Keep in mind that this is almost entirely for Class 4 and smaller
First, a new lever action .357, the ammo in game is actually great already but the revolver is limited by range and sort of loud for what it is to be honest. A lightweight lever action, either carbine or full length rifle, would extend the range by just a bit and give the cartridge a new use. It has such a wide range of use already it wouldn't take any change at all and still give us a cool new rifle for deer and smaller animals like lynx. a short rail on the barrel would be nice for red dot sights and scopes alike
Second, a combination gun, using the drilling's ammo swap mechanic. It would be useful to have a single gun with a .243 barrel over a 12 or 20 gauge barrel. it only offers one shot per caliber/gauge/ but allows a single weapon to cover all classes from 1-8. it could use regular rifle scopes to keep the 243 relevant and keep the range restrictions of the shotgun.
Third, another bolt action rimfire, preferably a .17HMR. It really would be focused on class 1 or 2 animals at farther ranges. Something with less bullet drop than the 22 and more accurate than the .22h (which would be fine as a 1-3 rifle so it doesn't have to compete with this or the regular 22).
To be Honest, none of these are major game changers and not necessary in the slightest, but they'd be really cool for those of us who love hunting the smaller game just as much as the big stuff