Spinsail, those are the factory rings: high. I traded the standard rings back to Ruger for the high rings.I never measured the throats; just order the bullets, loaded over 19.0 gr of h110 and shot it. My son has a Bisley Hunter that's shooting the same bullet just as accurate - except with 21.0 gr of H110.

James, that Hunter was a keeper, but I let a friend talk me out of it - with the understanding if he ever wants to get rid of it, it comes back to me.