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.30-40 Krag will also work, being VERY similar in shape and size to .303.
After I finish my "L-41 1/2", the next little project looks like it will involve raiding the "spares" boxes to cobble together a No5 style carbine (No4 Body) in 6.5 x 53R (Dutch / Romanian rimmed version of the classic 6.5 x 54MS). Rim and general case are very similar to .303. Should be a neat little "field" rifle.
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On the topic of caibre conversions, I've just completed a 45-70 and have several .44 Magnum conversions coming up.
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They don't exist if not conclusively shown by lots of photos ....
