No doubt heavier will hold a little steadier, but when shooting at the vitals the size of big game from field positions the advantage is not all that great. I've proven it to myself more than a few times.
Balance is the key to a great LW rifle.
Addition: Differences in individual body strength and size are also factors of what weight is best for one person over another. I'm on the LW side of the people scale. What works best for me may not be the same for a much bigger/stronger individual.
Battue, have you shot the postal (positional) match yet? That's a great way to see what rifle handles best in different field positions. Doing that shoot can be an eye opener: A rifle that you thought fit you best may not work as well as another in certain field positions. Try that shoot if you haven't yet..
