We have seen a few of these in the last couple years. Enfield pattern bullets with the "L" stamp in the cavity for Ludlow et al of Birmingham, England, but smaller than .577 caliber of normal Enfields, in this case he says closer to .45 but it looks a little bigger to me in the picture.
I told our good friend who dug this most recent one that I thought they were "stretchies" fired from breechloaders. That was before I saw the picture and now I am a little uncertain about that.
We may have solved this riddle before, but what do you all say about this bullet (shown next to a normal Enfield for comparison)?