My waters Mags have arrived. Thanks for the info @Tahr. I went for the standard length version which gives around 2mm extra loaded length compared to the standard Tikka mags. After measuring max the length to the land for the projectiles I use. 73gn ELDM, 69gn Targex and 75gn Hornady HPBT I found that the extra 2mm was enough to get the OALL length out to on or very close to the lands. Interestingly the 69gn targex which is the lightest of there projectiles needed the longest OALL to due to the long tapered Ogive but even with this one I can get to withing 1.2mm of the lands.
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