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Offset Red Dot for Open...dot size?


ropsitos

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Is there any sort of general consensus on dot size for this application?

Thinking that I would assemble an open div rifle that I would also use as a "precision rifle", so optic would be something like a 3-9 or 4-12/16 or some such.

I recently picked up $300 work of Cmore gift cards from the FN 3 gun match (thanks FN and Cmore) so I'm thinking an RTS2 would be interesting.  They come in 3, 6, and 8 MOA.

Based on the below, and the numbers primarily at the 50yd distances, I was thinking a 6MOA dot would work out nice.

thanks
bob

RTS2 Dot Size, in MOA
3 6 8
target distance MOA
8 100 8
8 50 16
8 25 32
6 100 6
6 50 12
6 25 24
4 100 4
4 50 8
4 25 16

 

 

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Going with a scope that the low end is higher than 1x or 1.5x complicates things a bit.

Typically I only use the offset red dot for targets within 40 yards when I need to have the scope set for a higher magnification.  The red dot saves me the time needed to throw the cat tail back and forth.  If all targets on a stage can be effectively shot without adjusting the scope, the red dot is not used.

Since we are looking at targets within 40 yards, consider using the same dot size you have on your open pistol.  In my case, I run 6 MOA dots on both.

 

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22 hours ago, ropsitos said:

Is there any sort of general consensus on dot size for this application?

Thinking that I would assemble an open div rifle that I would also use as a "precision rifle", so optic would be something like a 3-9 or 4-12/16 or some such.

I recently picked up $300 work of Cmore gift cards from the FN 3 gun match (thanks FN and Cmore) so I'm thinking an RTS2 would be interesting.  They come in 3, 6, and 8 MOA.

Based on the below, and the numbers primarily at the 50yd distances, I was thinking a 6MOA dot would work out nice.

thanks
bob

RTS2 Dot Size, in MOA
3 6 8
target distance MOA
8 100 8
8 50 16
8 25 32
6 100 6
6 50 12
6 25 24
4 100 4
4 50 8
4 25 16

 

 

Except that is not the way MOA works at distances less than 100:

target distance MOA
8 100 8
8 50 16 4
8 25 32 2
6 100 6
6 50 12 6
6 25 24 1.5
4 100 4
4 50 8 2
4 25 16 1
Edited by 2011BLDR
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For a given target size (using inches in my table for target diameter), bringing the target closer to the shooter increases the MOA, and I am comparing that apparent target size, at that distance, to the size of the dot.

for instance: 

@25yds a 1" group is 4MOA 

@50yds a 1" group is 2MOA 

@100yds a 1" group is 1 MOA

@200yds a 1" group is 0.5MOA.

http://www.indecorous.com/bullseye/moacalc.html

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3 hours ago, ropsitos said:

For a given target size (using inches in my table for target diameter), bringing the target closer to the shooter increases the MOA, and I am comparing that apparent target size, at that distance, to the size of the dot.

for instance: 

@25yds a 1" group is 4MOA 

@50yds a 1" group is 2MOA 

@100yds a 1" group is 1 MOA

@200yds a 1" group is 0.5MOA.

http://www.indecorous.com/bullseye/moacalc.html

If you have a 1 MOA dot and it covers a 1" circle of target at 100 yards, what is the diameter of the circle it covers on a target at 25 yards?  At 200 yards?

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45 minutes ago, Todd7446 said:

If you have a 1 MOA dot and it covers a 1" circle of target at 100 yards, what is the diameter of the circle it covers on a target at 25 yards?  At 200 yards?

Assuming I am correct in my calculations, 200yds would be 2", 50yds is 0.5", and 25yds would be 0.25"

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3 hours ago, ropsitos said:

Assuming I am correct in my calculations, 200yds would be 2", 50yds is 0.5", and 25yds would be 0.25"

Maybe I misunderstood the meaning of your first post.  When I read it the first time, I thought you were saying that a fixed dot size covered a larger area (higher MOA) on closer targets.

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  • 1 month later...

For me it is the brightness of the dot.  I have a 3 MOA dot and it is bright enough most of of the time.  Sometimes I wish it had a little more pop to find it quickly.  I have been using a 1-6 as primary optic, but am thinking about switching to a 2-10.  This means using the side dot more.

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