Reloading for Enfields is really hard. It seems if you go above the minimum loads you will have case/head separation issues. When you open the bolt after firing, your once fired brass will split in two and the head will fall out, leaving you picking at the rest of the casing that's stuck in the chamber.
This is because once the primer ignites, the casing expands into the chamber walls and there's still room for the head to push back against the bolt. This tiny amount of space is the problem.
It's hard to explain this exactly without a picture, but I'll try my best:
* Firing pin is released, it hits the primer and pushes the cartridge forward in the chamber.
* The propellant ignites, and the brass expands into the chamber walls.
* The brass sticks to the chamber walls, but there's still room for the head to be pushed back against the bolt.
* The amount of distance that the head travels back to the bolt causes the brass to stretch back a bit, causing a crack in the brass.
* When you open the bolt, your brass is cracked, or completely separated
One instant solution is to wrap some dental floss around in front of the rim, it makes it harder to close the bolt but will solve the problem. You have to make sure the bolt closes though, it can't be half assed. Some guys buy those tiny little o-rings but I just used floss.
Another solution is to get another bolt head, there's sizes #0 to #3 with #3 pushing the most against the chamber (less head space). Basically, this isn't an instant solution, you still need to gauge it to make sure the other head is safe. They're also hard to come by, check your head to see what number you have.
You can also size only the neck on your once fired brass, this way the brass is already expanded when you put it in the chamber.
I basically gave up on reloading high velocity for this rifle and just use it for hunting, it's too expensive to fire more than 20 rounds at the range for me. I have my hunting Enfield which is a #4 Parker-Hale, and it's the fuddiest rifle on the planet, with leather tassles on the sling. My other Enfield I just use to fire cast boolits which I buy from a guy off the forum. I load these with pistol powder and they go about 1600fps and I can plink for about 25 cents a shot with no recoil. Like you can hold the rifle to your crotch and fire at the moon all night with these loads.
Canadians don't need full power rounds to practice with, we're genetically gifted with these rifles already, and everyone should be issued one at birth to protect against polar bears and zombies.
