I have seen lead bullets deform and morph into figures that HP's would dream of looking like.
So other than saving the time of scrubbing the lead fouling out of a gun barrel, are there any other disadvantages of a LRN that makes it significantly lesser than a FMJ? Now I am not saying we start casting .357 Sig LRN but for ammo under 900 fps (gas checked or not) does a LRN offer better wounding aspects than FMJ? A plain lead bullet can definitely deform greatly after hitting hard bone or even squash if rapidly decelerated through tissue. I have seen FMJ clean enough to be reloaded and shot again just like the brass it came with.
For reasons like this it is under my presumption that a LRN would be of higher capabilities than a FMJ.