I have a M97 in .357 with 5 1/2? octogon bbl and a 45 Colt with 5 1/2 round barrel. Both with Trijicon RMR and FA mount. I love shooting them and have found comfortable and heavy loads for both. I used to have an 83 454/45Colt and traded it for these but am thinking I may want one again. I don?t like collecting things though so I will have to wait until I find that I need it. KRal, I will see if I can post some pics with the Trijicon.