Not much help except to say I use either Warne or Burris Sig with the reversable clamps and they fit a treat on either.
And yeah this chart confirms yours as 3/8"
http://www.diproductsinc.com/UIImage...alog-Chart.JPG
I have also recently used a set of these
https://www.jnpgunsprings.com/produc...roducts_id=247
but in 11mm option on a 455. I wanted to play with the scope height a bit and had a spare set of Burris Sig Zee rings in the right height. A nice solid set up.
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