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Yup, there are always thing you can do to make the .308 perform better at 1,000 yards. But, as you have noticed, the bigger cases with the heavier bullets do make it a whole lot easier. Bullet weight is king at that range. Actually, ballistic coefficient is king, but that is achieved in a large part through bullet weight, so it would be more accurate (pardon the pun) to say "heavy for caliber bullets are king".
I'm not familiar with the 20 MOA base. Does that mean it is adjustable, with 20 MOA of elevation, or is it a brand of base? The base really is critical to scope use at that range. Most scopes will run out of elevation, or have the erector tube so far off center as to distort the sight picture if cranked up that far. Traditional parallel to bore mounting usually won't work. That's not something most guys would even consider until they make their first trip to a 1,000 yard range.
I guess lots of things come to light on that first trip. Most folks, most certainly including me, go home with their tail between their legs. It's a hard game to play. Harder than it looks, but I'm sure you know that. Pretty darn addicting, though...
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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