I run my Mark 5 triggers at 15 ounces. They will do that with the factory spring and if you change the spring they will go down to 6 ounces. No need to buy anything for a Mark 5 to get a really sweet trigger.
And how do you get a factory spring do 15 ounces?
I have one (1) Mark V that allows me to go down very low with the factory spring. The rest stop above 3 pounds, just like Weatherby says they will. If there's a trick I'd love to know it.
No, reread what I said, I can get 15 ounces with a factory untouched spring. It just takes less sear. I do no cutting or polishing no nothing than allen screws. 15-16 ounces is the bottom with a factory spring.