You can see from above posts I like Enfields and here is picture

of how we set up action for long case and a singlestack magazine.

We open bottom of action for length and use a lip type magazine

insert to feed cases single stack. And lips are springy so we

can load from the top.

Here is the second gun I did years ago in the 585HE, an old style

Ruger 77. And at that time I used the cases I made myself and

they work great in the gun, high pressure loads, and extracted

easy like the new ones from Bertram.

Here is some math to show why I really like really big bores.

There is term called Average Barrel Pressure, which is the average of

all the pressures in a barrel, from the start where you have highest,

called peak pressure. to the lowest at the muzzle when bullet exits.

For high powered rifles average barrel pressure run 15-18000 psi.

There is a formula that can be used to get Average barrel pressure

fairly close if you know the muzzle energy.

We multiply ME times 12 and divide by barrel cross section x length.

We simplified it to get the 12 figure, It is inverse of the bore dia x 5

For the 585 it comes out about 10

Example a 458Win usually loaded to 5000 ft lbs, say in a 24" bbl.

ABP = ( 5000 ft lbs x 12) divided by (.17 sg in x 24") = 15,000 psi

Now you see there isn't a lot of room for big gains, as it would take

peak pressures damaging to brass and gun, to get say 50% increase.

Now example of 585HE in the 26" bbl we like, say a 7,000 ft lb load,

a real moderate load in this case. Could use 10 in place of 12,

but kept it all simple

ABP = (7000 ft lb x 12) divided by (.27 sg in x 26") = 12000 psi

The bigger bore allows for a much larger potential,

a 50% gain is easy to do.Ed