I would not fire it on a regularly, as in most of the time. The K frame IMHO is marginal for continous use of +P. As you know the model 19, etc is a K frame and is a 357 but I always practiced mostly with 38 and carried 357.
Just my thoughts, YMMV
PS K frames and old K frames are one of my favorites
P14 will be in 303 British, had one, great rifle. Same as the M1917 except they were in 30-06. here is a link with more info Pattern 1914 Enfield - Wikipedia, the free encyclopedia