I think silhouette shooters demonstrated the weaknesses of the Model 29 design in the �80s. S&W then undertook a redesign/upgrade to eliminate or mitigate those weak areas. Today I think the design is recognized as being suitable for any SAAMI loads, but the light weight of a Mountain Gun certainly has an effect on the shooter. Loads that beat me unmercifully in my 40 oz. Mountain Gun are just fun in my 56 oz. Dan Wesson 744.