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Help me choose a base

Have a sightron siii 8-32 has 79moa of adjustment that I have checked myself. Currently with a 20moa farrel base I have 27.1moa of down adjustment left. My action is obviously not perfect so I'm using up 7.6moa to zero.

This gives me the option to go with a 40 or 45 Moa base, a 40moa base will leave me with 7.1moa down adjustment and a 45 Moa base will leave me with 2.1 Moa down.

I will be shooting to all distances up to 1500m. I'm tempted to go with the 45moa base so I have a huge adjustment up if I need it. I have read it can cause problems to zero so Close to bottom of erector. Does anyone have any personal experience with sightron siii 8-32 do they track well at bottom of elevation?

The mechanically centre would be out around 1000 yards with a 45moa base which would be good. Anyone got any thoughts on this would you go 40 or 45 Moa?
 
Thanks mate as long as I have enough Windage to zero at 100 I should be ok.

Anyone else got any thoughts is 2.1moa from bottom going to cause any other issues?
 

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