Re: springfield scope
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body"> That said, if the scope is set up for 168's, then no, it won't work with the 147's. The trajectory will be different
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I challenge you to run the ballistics on that.
Sierra III and my own experience showed that my 45.5 748 loads with Winchester 147-gr FMJBTs (a reliable 2 MOA load for very cheap), and my 43.0 748 load with any flavor of 168 HPBTs, tracked trajectories within .75 MOA of each other out to at least 600 yards. Lower BC + enough speed = similar trajectory.
Wind was a different matter, of course.
The speeds were something like 2580 with the 168s, and 2750 with the 147s, measured at 10 feet. IIRC. I haven't looked at it for a while, not wanting to deal with the temp/velocity curve of 748. Stuff metered like dream and my Dillon-produced ammo with thrown charges was reliably 1 MOA or less until the barrel faded out. This was with an M1A.