bart,
Not sure I understand, but if you already picked up the Tactical 2 (which is not an LRS2 offshoot, since the barells are incompatible) and you have the Leupold, why not just mount it? Or is my understanding that you haven't paid for the rifle yet (since you say you have to fund it; you mean ammo?)?
Arrowhead,
Actually, what I managed to do was tighten the screws with the star-patterned slots opposite the levers on the QD mount (which is what I have), and it seems to have done the trick, despite my scope weighing a kilo! That's an impressive group @ 600m... I don't have a caliper, but here's my best group at 100m (dark circle with 'X' is 1" across, big hole = 4 shots, small hole = 1 miss):
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You're lucky you get access to that Farnham range - who was your hookup to get you to shoot there??
Nice group! what load did you used?
My personnal best at 200y

At 200y got four of them in .096"

I was shooting at St-Bruno 1000y range, when the military closed the range they gave PQRA members access to the 600m range in Farnham