Seems counter intuitive to us who shoot original Low Walls, but evidently modern metallurgy triumphs. I have a Browning LW in .223 and it digests anything I shove into it. I wouldn't think of jacking things up with my 1910 vintage LW in .25-20 Single Shot. (Never mind too that brass is $2-3 a pop when you can find it.)
The Miroku Low Walls have been made in .243 and ,260 Rem for a number of years, and the 6.5x55 is the same case head size, so I would think any reasonable load is fine for the action (with modern steel)
I still wish they make one in .30-30, with the exact same configuration. It's possible the .308 bore is a hair too big for that barrel contour. I tried to get both C Sharps and Ballard to make a Low Wall .30-30, and neither were interested.
In any case, I just grabbed a 6.5x55 off GB. The wood is not as nice as pictured above, but it's good.
