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Seem to remember Layne Simpson developed that cartridge on a 26" barrel. Ruger brought out an 8" twist barrel on the 77 in the late 80's,I would think that if you have one of those on your #1 you might be best to consider rebarreling. I know on my 77 it lost at least 50-75fps (think it was 3gr H870 less) to where the pressure signs started showing compared to the Browning A-bolt in 7mm rem mag. No point in hampering yourself to build an STW.
 
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