Re-barrel No 4

[browningautorifle]

You may have problems with the pressures of 7.62 over the 303 in the receiver. 7.62s were re-treated or specially selected I think, they weren't just a standard action. Give it a minute, there's others here that will tell you for sure.

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[Beerhunter]

You may have problems with the pressures of 7.62 over the 303 in the receiver. 7.62s were re-treated or specially selected I think, they weren't just a standard action.

I have shot dozens of No.4s converted to 7.62mm over the years with no ill effects. None of them were specially treated in any way and they all passed English Proof. (A legal requirement in the UK.) Converted No.4s were very popular on English ranges before the advent of "proper" target rifles. Additionally, Enfield built the 7.62mm L.42s, L39s and Enforcers on the No,4 action.

I think getting the 2A barrel to fit the No.4 action would be the biggest obstacle. Don't they index 180 degrees out?

As to the OP's project, a chap in our club has a 7.62mm No.5/4T hybrid. He took a No.5 and swapped the No.5 parts to a No.4 action with a 7.62mm barrel. Next he added a set of scope brackets and a No.32. It made a quite competitive Practical Rifle.