Factory guns are purpose built for hunting, in the field, with hunting catridges, and they just couldn't be more opposite than purpose built BR guns(which are none of these things).
So while 'Factory' class is mandated as an 'expected cheap & disabled' class, it's not benefiting to anyone serious about factory/hunting gun/hunting cartridge accuracy.
Also, there is by far more knowledge here related to benchrest guns & BR shooting, with BR cartridges, than to hunting guns accurate in the field.
I'm pretty sure this is why factory & benchrest will remain oil & water.