As I may have mentioned, I own an ugly sporterized P1914. The wood around the barrel is gone and the barrel itself free-floated: the design is functional but uglier than some White House interns. I bought it for $85 which included a 20 round box of UMC ball and work to add sling swivels and a sling. I found that the rifle was very accurate and that it kicked less than one would have anticipated given its lightened condition. Recently, I replaced the original bolt mechanism with a "speedlock" kit which, in essence, upgraded it to a Remington 700 type trigger. It now cocks on opening and the trigger got crisper, lock time shorter. I decided to try it out. I also dug up some "good" ammo that I had stashed to check functioning.
As expected, Greek and South African non-corrosive ball worked fine. The surprises came with the Remington ammunition.
Soft-point round nose ammo would not feed from the stripper clip, though it would feed fine once load into the intergral magazine one by one.
To my surprise, UMC ball would not load from a clip either!
Accuracy was good with all rounds but Greek ball had a slight edge, followed by the rest of the bunch. In the past, only rather ratty Canadian ball had distinctly worse accuracy (i.e. 2" at 25m instead of 1/3").
The lesson of this is to make sure you try your nice, premium, designer, social ammo before serious uses. I used to think that I'd use the soft point for fighting but now would rather use Greek, South African or even original British, if only for the hollow nose construction (similar to Russian 5.45). Similarly, Speer 124gr +P which worked great in every other gun would not feed at all, not even once, in my Kahr P9 (which would otherwise be 100% with any other ammo brand/weight/type). Try before you rely.