Throats on the lee's were generous to say the least but another malady that can present itself is cord wear unless a person knows what they are looking for at the muzzle end they may miss the fact the rifle is afflicted with such a thing and keyholing.
We are blesse3d today as companies are turning out barrels for the MkIII's both heavy and std and for the No.4's as well the problem we are faced with at the other end of the spectrum is personnel who know how to install them I mean we have BD in the US here we have tbonesmithicon over east I have not heard how well Beaton firearms here in W.A do up the Lee's but as you can see not huge numbers and its not just a screw in and she's apples.