Have a 7mm WSM with 21" barrel 16-8:1 inch twist that easily gets 3035 fps with 175 gr bullet. Its set up as a long range target rifle for 1000 yd benchrest. It has shot a few 4.4" groups at 1000. Its also made the trip to one mile where I got a fantastic group. I think they are worth doing. I have seen a couple extra long barrels with gain twist fail to develop reasonable velocity without excessive pressure.
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