Altamaha,

I guess someone forgot to tell my Lyman 48 receiver sight that it is too fragile to use on a big bore stopping rifle. It has been on my .505 for 40 years now, and is still holding up fine.

The same is true about my 1930's vintage Noske scope on my bolt action .577. It just keeps chugging along.

I have the feeling that the Lyman sight, at least the late model ones, do not have enough mass to cause inertia problems, where the earlier, heavier models probably did. Mine is a late model.