Have a "cut down" No.4 Mk1 with Williams FP and red firesight front. Mostly use it as my foul weather gun.
Not pretty, but it shoots. Likes Rem. 180gr RNCL's. Longest shot was a doe at about 85-90 yds, thru both lungs, ran about 35 yds and fell dead. Of the half-dozen I've shot with it that was the farthest any ran after after lung or shoulder hits, most either went straight down or stumbled a few yards.
All so far have been thru and thru with a good sized exit and much blood.
It's one of those rifles I wouldn't even consider selling or trading, even if offered twice what it's worth!