Here is what it says on the Buffalo Bore web site about 38 S&W loads:

"This ammunition is safe to use in ANY solid frame revolver that is in ordinary shooting condition. “Solid frame” means any revolver that is not a top break frame. “Ordinary shooting condition”, means ANY revolver that is in condition to fire any factory made, 38 S&W ammo, without malfunction. Have a competent gun smith check your revolver for “ordinary shooting condition” if you have doubts, as many of these revolvers are very old and some imports were made of questionable quality as manufacturing techniques and materials were not advanced one hundred+ years ago. Be certain to take a copy of this press release to your gunsmith, so he can understand the context of your questions."

38 S&W (38 COLT NEW POLICE) Pistol & Handgun Ammunition