My Webley Mark III was made much later, 1927. I use 1.8gr Titegroup, so no argument with 1.7gr. W231 is 2.3gr, both with a 158gr .358 Missouri Bullet LSW.
You might want to slug your barrel, just so you know.
Remington Match is .357 and Privi is .358. I do not know if either is hollow based.