VFS is group guns LV and HV shooting score 6 bull targets, a sighter that you can go at any time in the lower right and the other 5 get 1 each and you are after the dot (approx. .16" and 100 yds) in the center of the target. The bigger cals get the advantage and it's best edge.
Hunter class (10 lb, 45g of water (30-30 capacity)) and Varmint Hunter (smaller cases cap allowed, 6PPC 6BR etc) class was the same game but had to make with a 6 power scope and that was the game I play.
The exception to the 6 bull target in the old days was a two bull for the 300 yd stage (smaller target frames vs the new 6 bull 300 yd the use today). The one was more like group shooting where you are move up and down for record to sighter. The targets are 1/2 moa targets at all yardages or 1/2" 10 ring at 100, 1" at 200, and 1 1/2 at 300. Here's an old 300 yd example.
The big difference between US F Class with 1/2 10 rings (I call it belly BR) and BR is that in BR, which is always shot off a bench, we bring our own flags, set our rifles up, go out in front of them and set flags with the shooter directing the flag setter and yardage changes take time, big time. Plus you get your targets at the end of the day. With F Class, 300 M to 600 yd is the short game. 800 to 1000 is the long. The DCRA targets which most PRAs use are bigger with a 1 moa V and and 2 moa 5 ring. All of these are score games. I have all the rifles exc. LV & HV but my FO out weights any I had and it would make IBS Light gun at 17 lbs, or I could go unlimited with the steel check pc. and a one pc rest... hum.... and I'm still playing the score game and lov'n it