I've never used a barrel clamp on a mag tube as it just got in the way as much as anything else, particularly during cleanings.
Considering a longer Nordic extension so I thought I would reassess the things. My 1301 really shoots the 1300fps Truball load well, most of all I don't want to mess with the zero.
Of course this is no thin barreled .243, just how sensitive are slug loads to the clamp being removed and replaced?
Nordic suggests you loosen the tube up to one complete turn to allow the tube to "float". Sounds odd, I wonder if it works?
Finally, does it bring any significant increase in sturdiness to a 2-3 round extension that will not extend past the muzzle?
Thanks...