I'm going to re-barrel my Ross Mk III

[browningautorifle]

I've never loaded .308's in 303 cases

I did that back in the '80s and it worked exactly the same as loading anything else. Your expander ball in the size die must be from a .308 or turned down to accommodate. The dies seemed to size the neck down fine and the cases held .308 bullets fine. I loaded for .303 ammo with 150 gr spec because that was what size I used. They shot fine. I think that's a great idea...too. After all it's your rifle and you want to shoot it.

Maybe look into re-lining the original barrel?

I'm not sure about the safety of lining a full bore cartridge, do they do that? I know about smaller calibers like the pistol and .22...? Do they install barrel liners in .303?

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[Gustro79]

I did that back in the '80s and it worked exactly the same as loading anything else. Your expander ball in the size die must be from a .308 or turned down to accommodate. The dies seemed to size the neck down fine and the cases held .308 bullets fine. I loaded for .303 ammo with 150 gr spec because that was what size I used. They shot fine. I think that's a great idea...too. After all it's your rifle and you want to shoot it.



I'm not sure about the safety of lining a full bore cartridge, do they do that? I know about smaller calibers like the pistol and .22...? Do they install barrel liners in .303?

I talked to Krieger about this tonight. Yes, he says a re-lined barrel is completely safe. The trick is to find someone with the ability and willingness to do the job. He said something about needing to see if that's "available" in .303 brit. (I don't know what that means exactly.) That is the best-case scenario for a collectible rifle with a sewer-pipe bore imo.

[browningautorifle]

marking it on the barrel

Absolutely...308/.303 or something.

"available" in .303 brit.

I think he means the reamer. The bore would be easy but the reamer would be special. I think the Australians shoot some .308/.303. They have done lots with .303 rifles and I'm pretty sure a reamer is available.

We did a whole examination of this before here... https://www.milsurps.com/showthread.php?t=56698

Here's more... Reloaders: Can I use a .308 projectile in a .303 rifle? | The High Road

Here's a manufacturer that you could examine or try Brownells but I think this one's a special order. 30 Cal - 339 Cal Chamber Reamer - Pacific Tool and Gauge