Re: 8-40 Base Screws...Necessary?
I've had both and can't find any difference. I've pretty hard on my rifles as folks that know me will tell you but I haven't broken and mount bases off the rifle using either #6 or #8 screws. I've NEVER heard of anyone breaking a scope base loose from the rifle either on hunting trips or during sniper stalks or field exercises.
But, I do like to have the #8's on my rifle, it makes me feel a little better knowing that it's a little tougher (in theory).
My vote is to get the work done and never look back.