I have one or two Lee Enfields and most of them have mismatching bolts. With all those, it's the outside lug that engages which is also the strongest lug but still. I know that these rifles have been fired with full house loads to no ill effect but in principle, this is not a good idea.
So, what exactly is the ill effects of firing full power loads with only one lug bearing?
Also, what would be considered a safe load with such a rifle?
One rifle I acquired even had a mismatching barrel! It had a Martini 303 barrel on it which was loose and could not screw in all the way due to the extractor alignment. Well, I shot this rifle with low pressure loads and it was accurate with paper patched boolits. I should say that apart from the barrel not screwing fully in, the lug recesses showed a lot of set back. Who would have thought a loose barrel would shoot straight?
By the way, I do have a few guns with matching bolts so there are some shooters in my collection.