Hi Southern, it's clear you know a lot more about firearms than I (and I have learnt a lot from many of your posts), but here I must either disagree, or admit that I don't quite understand what you are saying. Allow me to illustrate, this is how my rifle came to me, with two piece weaver style rings:
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I could not get the scope forward by any more than the clearance between the dials and the front ring (about 3/4"), except by turning the front base through 180 degrees like so:
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Even then the damn thing still thumped my eyebrow whenever I took a shot from prone. I was then limited by the location of the rear base, however once I'd fitted a rail it much, much easier to mount a scope (ironically, by this point I had lengthened the the stock, and therefore could probably have stuck with the scope mounting arrangement that I had).
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I don't see why I couldn't or shouldn't use the slots towards the centre of the rail if that suited better scope placement for me. As I said, I'm probably missing something, but on the strength of my limited experience I would urge rail over two piece weaver bases.
Guy