Every time I decide to take part in a discussion like this, I find there is always a bit of reminiscing involved. That's because I'm 75 years old and have been participating in various shooting disciplines for 60 years. In general, I never really got involved in anything which was an equipment race or if I did, I didn't tend to spend a lot of money on it.
In the beginning, "F" class called for any rifle, any sight, fired from any rest except a return to battery rest. If you want a hunting rifle class, the rules should call for any rifle of ten pounds or less, to include the scope, and any other accessories attached. To be fired from any rest. If you make it factory only, it takes the opportunity to experiment out of the equation. You eliminate a bunch of potential competitors right away. Eventually, the winning rifle is likely to resemble very much a HBR rifle, but such is life. Of course, right away, you will have some guys who will say, "My 7mm ultra Super long range hunting rifle weighs 13 pounds. What do I do?" Well, I reckon you won't be shooting that one will you, Buckwheat.
Another will point out that the MicroMatic click adjustable bipod and the Nightforce scope on his Kimber Montana, puts it over ten pounds. Oh, well. Take the bipod off and shoot over a sandbag.
I used to attend local turkey shoots. These were always a kind of "Run what you brung" affair. The benchrest was often a picnic table with a sack of sawdust or sand on it, and everyone used the same rest. I always just took a couple of my better hunting rifle unless I knew the competition was going to be a little stiffer. I well recall going to one shoot, in a very remote logging community. Not wanting to scare the competition, I took my Lee Enfield sporter, which was a very good shooter, for what it was. When I got there, guys were just getting set up and the first man to shoot walked up with a Shilen DGA and a fat barrel, in a Brown Precision Hunter stock. Most everyone else had their favorite coyote rifle which varied not much from the first guy. My 1 moa Lee Enfield was in rarified company! I'd have gone home turkeyless, but they held a couple of offhand matches and I was able to fluke one in. The point is, these shoots were held for fun and most everyone stayed within the spirit of the whole thing.
The thing is, if you wish to cater to the modern-day long-range hunter and his 13 pound specialty rifle, that's what you will get. Guys who don't want to spend the big bucks on an outfit like that, won't come. On the other hand, if some restrictions open up another class of competitive shooting, it will create its own interest. WH