0 MOA or 20 MOA

[mtbbrewer74]

Do I need a 20 MOA rail?

- Bolt action 308win with a 20” barrel and twist rate of 1:10
- Scope has 60 MOA of adjustment -30/+30
- Probably won’t shoot over 500yards


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[Bowhntr6pt]

No.

 

[mtbbrewer74]

Thanks for your reply. I had been seeing that answer on line a lot, but wanted to hear from local guys.


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[Bowhntr6pt]

Thanks for your reply. I had been seeing that answer on line a lot, but wanted to hear from local guys.


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Depending on the specific ammo, at 500 yards, you're looking in the neighborhood of 11.5 MOA or 3.4 MILS... you can actually just hold for that with a good scope.

I usually just use holds out to 300 anyway.

 

[kylo1597]

with a zero moa rail/mount you should be able to dial up to well over 1000 yds

 

[Bowhntr6pt]

with a zero moa rail/mount you should be able to dial up to well over 1000 yds

I don't think so with a scope that has roughly 30 min to work with... below is just a rough data point, looks like it will come up 8 MOA short at best. Sample is a 168gr Match bullet with a BC of about .462 launched at 2700 FPS.

Range- 1000 Yds
Vel at 1000- 1189
Drop- 398 inchs
-398.4
Come up MOA- 38
Come up MILS- 11.1

 

[kylo1597]

I don't think so with a scope that has roughly 30 min to work with... below is just a rough data point, looks like it will come up 8 MOA short at best. Sample is a 168gr Match bullet with a BC of about .462 launched at 2700 FPS.

Range- 1000 Yds
Vel at 1000- 1189
Drop- 398 inchs
-398.4
Come up MOA- 38
Come up MILS- 11.1

Ohhhh damn that’s not a lot of built in adjustment. Maybe you do need the 20MOA rail then

 

[SLTW]

Just get a 20 MOA. At worst it doesn’t hurt anything. At best you get the comfort knowing you can get to 1000 pretty easily.

 

[Bowhntr6pt]

Just get a 20 MOA. At worst it doesn’t hurt anything. At best you get the comfort knowing you can get to 1000 pretty easily.

Yep... better to have and not need vs. need and not have.

 

[mtbbrewer74]

If I go with the 20MOA will I be able to dial in shots under 100 yards?


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[SLTW]

If I go with the 20MOA will I be able to dial in shots under 100 yards?


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Yes it’s only roughly 2.5 MOA from 25 yard zero to 100. From 100 to 1000 it’s 36.77 MOA. I did a 175 grain FGMM going 2550 FPS for trajectory. You’ll have 10 MOA of up travel left.