I have argued with guys about this to no end , if you hit your scope hard enough to knock the base off the gun the scope is ore than likely gonna be any good , the same goes for up grading from 6-48 to 8-40 screws.
I personaly bed the base to the reciever with Devcon and only barely tighten the screws till the epoxy cures then they are removed the release agent is cleaned away and they are tightened to the reciever and torqued down , this causes the base to have much more contact with the reciever and when its tightened down to the action will be much more secure than the base with minimal contact , think of it as traction controle.
I will however retap a reciever to 8-40 if I find the holes in the action to be crooked and this happens alot in factroy gun. On the few bases I've made for rifles I built in a "recoil lug" that fits in the ejection port snugly that will all but eliminate any shifting of the base under any recoil or stress , isit needed , no but it looks cool and functional. I made a base for my personal tactical 308 thatis a titanium 20 moa piccatinny rail , their is 3 , 8-40 screws in the front and two in the rear and the base has two lugs that fit in the ejection cutout that fits snug enough that it had to be lightly tapped in place , you coulden't beat that thing off , is it needed , no ,but it sure looks cool
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