Just like the girls we dated, some will, some won't, some do, some don't.
There are a lot of reasons why some Lee Enfields will shoot consistently very well or very poorly.
Way to many to go into here.
Your rifle/load seem to be performing very well.
bobfortier, just because his load, worked well in that particular rifle, doesn't mean it will work well in yours.
I'm willing to bet, clean up the bedding, properly adjust the fore end pressure, start out with an excellent barrel with a tight/square/receiver/bore and you will find that the rifle will shoot one inch groups consistently, as long as you do your part.
If your rifle is worn, bedding pounded down, sloppy action with worn bore, it won't matter what load you use, it will be a 4 inch shooter, until it's fixed.