Re: What does anybody think?
Personaly i prefer the 8-40. Now the 6-48s will certainly hold in most situations, and on a normal hunting rifle with a typical leupold attached then i can't see you having any bother. A different matter alltogether is one of these bid heavey European scopes that weigh in about 2lbs +. combine that with a heavey recoiling rifle, and then ad a moderator and we have a different ball game perhaps.
I don't know why manufacturers continue to use the 6-48 size exept for the fact it gives us smiths some room to play with when re drilling and tapping holes that come of centre from the factory.
Whichever thread size, its a good idea to bed the base to the rifle, I like to glue mine in place with Devcon. Bedding the base gives several advantages, 1. it takes up any minor differences in fit between base and reciever/action. 2. when glued in place it certainly helps the base stay put. 3. it prevents the ingress of moisture under the base causing rust. Don't forget to lock the screws with some form of thread lock, but make sure its a thread lock with the correct grade and not a super glue cos if you super glue the screws in the sods will probably have to be drilled out, which is a common occurance i find on rifles where the owner has treid to do the right thing to stop the screws shooting loose by glueing the screws in.