Rifle Scopes 20 or 30 MOA base

[CowboyBart]

How much MOA in a base do I need?
With a 200 yd zero I am 21 MOA down at 1000yds. If I get a 30 MOA base will I be able to zero at 200, or will I have to zero at 3 or 400? Currently I can only shoot to 1000yds, if I can find a spot to shoot longer, I'll try it.
I don't know the total adjustment available in my scope. It is a Springfield 6.5-20x56 and is currently out getting refurbed. If somebody has data on this scope it would be a big help.

 

[Captain Kirk]

With a 30MOA base, you should have no problem getting a 100yd zero, and get another 10MOA on the top end. This of course depends on how much internal travel your optic has, and how much you have used up zeroing the rifle.

Kirk R

 

[fenwick253]

I suppose the cartridge you shoot would play a crucial role. eg. .260_fast moving light bullet vs .308_slow and heavy. you might not "need" the extra elevation but as long as you can achieve your desired zero, I don't see how more elevation could hurt.

 

[CowboyBart]

OK, I'll go w/ the 30 MOA base.
It is a 264 WM w/ 29" Lilja barrel. Once I get the scope on, I'll chrony it to see where I'm at. I want to use 140's but might go w/ 130's. If I could find a 160 VLD type I would be real happy!!!

 

[kansas]

The vortex PST had around 18 mils of travel and with a 20 moa base I had a total of 14.3 mil before I ran out of adjustment. Then I had to do holdovers. I Doubt your scope has any more travel than that. I could shoot to 1100 yards without holdovers with a .308 with a 100 yard zero.