No hold works for me shooing a rifle resting atop something on a bench top. Best I could do with my first .308 Win. match rifle was about 1.25" at 100 yards. I watched a dozen or more folks try their hand shooting that 12-pound .308 Win. match rifle with a 2.5-pound trigger and its ammo from the benched position of their choice and their 10-shot groups ranged from 3/4" to near 2" at 100 yards. The rifle and its ammo easily shot sub 1/2" groups at 100 yards when I shot it slung up in prone with a soft bag under its forend and another under the stock's toe.
The more one holds onto a benched rifle to test its accuracy, and the more recoil it has, the worse it shoots; in my opinion. Benchresters shoot their micro-groups with their rifles touched only by a finger on their 1- to 2-ounce triggers and they free-recoil back to the shooter's shoulder then stop. Us humans are not very repeatable holding onto rifles testing them for precision performance. But most of us think we are; I sure did, once upon a time. . . . . .
It's a tough pill to swallow. Everyone I've convinced to test their stuff shooting prone with soft bags under the rifle has agreed; they shoot more accurate that way with high powered rifles designed to be fired off ones shoulder.
That positon I was taught decades ago is now often used in F-class disciplines. And I really don't like a hard legged bipod under the stock's fore end.