Good morning Bob. We have built many 6mmbrs on tikka 590/595 actions and have used the 243 mags and also 22.250 mags. The 22.250 mags worked well ,the 243 did require a little fettling to get 100% reliable feeding from them. The best solution we found was to use the 5 shot steel 223 magazines and alter the feed lips ( ie open them so the round presents correctly to the bolt face to strip and feed into the chamber) and they worked faultlessly . I hope that is of help
yours respectfully Mike Norris Brock and Norris Custom Rifles
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