it's not, but you could cut wait even further buy using the 3-12x44 (535g) or 1.5-9x44 (575g)
I think the closer parallax and minimum mag of 2.5 would be more useful comparing the 2.5-15 vs the 3-18.....talk to Martin at Ammo direct Rolleston he'll give you plenty of guidance around GPO's
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