I am new to the long range shooting world, and I am building a new rifle, my last rifle had a zero rail, my question is what is the advantage to having the 20 MOA? more adjustment?? and do you have to sight in or range it differently, when using the mil-dot is your calculation different than the zero?
Rifle Scopes O MOA rail vs 20 MOA Rail - sighting in diff
- Thread starter RedRaider271
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Re: O MOA rail vs 20 MOA Rail - sighting in diff
No differance, just get to use more of your elevation in your scope.
No differance, just get to use more of your elevation in your scope.
Re: O MOA rail vs 20 MOA Rail - sighting in diff
So you make adjustments on the scope the same you just have more elevation? is that correct
So you make adjustments on the scope the same you just have more elevation? is that correct
Re: O MOA rail vs 20 MOA Rail - sighting in diff
You are able to have more available elevation adjustment "up" because you already have 20 MOA of elevation built into the mount.
You are able to have more available elevation adjustment "up" because you already have 20 MOA of elevation built into the mount.
Re: O MOA rail vs 20 MOA Rail - sighting in diff
20moa base will give you more scope elevation. In general, scopes track better in mid-range of tension, but has improved with newer scopes.
20moa base will give you more scope elevation. In general, scopes track better in mid-range of tension, but has improved with newer scopes.
Re: O MOA rail vs 20 MOA Rail - sighting in diff
Just be aware when you first sight it in, you will likely be 15-20" <span style="font-style: italic">high</span> at 100 yd. This is because the base will have the built-in downward cant of 20 MOA. The amount of elevation you dial down on your elevation turret to reach your zero is what the canted base gains you back on your total upward elevation travel.
Just be aware when you first sight it in, you will likely be 15-20" <span style="font-style: italic">high</span> at 100 yd. This is because the base will have the built-in downward cant of 20 MOA. The amount of elevation you dial down on your elevation turret to reach your zero is what the canted base gains you back on your total upward elevation travel.
Re: O MOA rail vs 20 MOA Rail - sighting in diff
Thanks for the info on that, thats what I was wondering
Thanks for the info on that, thats what I was wondering
Re: O MOA rail vs 20 MOA Rail - sighting in diff
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: gstaylorg</div><div class="ubbcode-body">Just be aware when you first sight it in, you will likely be 15-20" <span style="font-style: italic">high</span> at 100 yd. This is because the base will have the built-in downward cant of 20 MOA.</div></div>
i don't understand this? do you mean if you don't bore site and just guess? not a flame, just trying to understand more about something new to me.
looks like if you bore site, it's a wash?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: gstaylorg</div><div class="ubbcode-body">Just be aware when you first sight it in, you will likely be 15-20" <span style="font-style: italic">high</span> at 100 yd. This is because the base will have the built-in downward cant of 20 MOA.</div></div>
i don't understand this? do you mean if you don't bore site and just guess? not a flame, just trying to understand more about something new to me.
looks like if you bore site, it's a wash?
Re: O MOA rail vs 20 MOA Rail - sighting in diff
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mattlewis</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: gstaylorg</div><div class="ubbcode-body">Just be aware when you first sight it in, you will likely be 15-20" <span style="font-style: italic">high</span> at 100 yd. This is because the base will have the built-in downward cant of 20 MOA.</div></div>
i don't understand this? do you mean if you don't bore site and just guess? not a flame, just trying to understand more about something new to me.
looks like if you bore site, it's a wash?</div></div>
You are correct. He was assuming a hypothetical situation where the OP would take the optic/mount off his current 0MOA rifle and install it on his new 20MOA gun.
Boresight is boresight. The type of rail makes no difference; they all boresight the same.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mattlewis</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: gstaylorg</div><div class="ubbcode-body">Just be aware when you first sight it in, you will likely be 15-20" <span style="font-style: italic">high</span> at 100 yd. This is because the base will have the built-in downward cant of 20 MOA.</div></div>
i don't understand this? do you mean if you don't bore site and just guess? not a flame, just trying to understand more about something new to me.
looks like if you bore site, it's a wash?</div></div>
You are correct. He was assuming a hypothetical situation where the OP would take the optic/mount off his current 0MOA rifle and install it on his new 20MOA gun.
Boresight is boresight. The type of rail makes no difference; they all boresight the same.
Re: O MOA rail vs 20 MOA Rail - sighting in diff
Easiest thing is forget that the new 20moa mount is anything but a regular mount and sight in as usual. You'll just find you have more travel up in the scope and be happy when you can crank up and hit targets farther away by still holding center on them.
Topstrap
Easiest thing is forget that the new 20moa mount is anything but a regular mount and sight in as usual. You'll just find you have more travel up in the scope and be happy when you can crank up and hit targets farther away by still holding center on them.
Topstrap
Re: O MOA rail vs 20 MOA Rail - sighting in diff
thanks. just wanted to make sure i wasn't crazy.
thanks. just wanted to make sure i wasn't crazy.
Re: O MOA rail vs 20 MOA Rail - sighting in diff
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Delta271</div><div class="ubbcode-body">I am new to the long range shooting world, and I am building a new rifle, my last rifle had a zero rail, my question is what is the advantage to having the 20 MOA? more adjustment??</div></div>
For clarification, the use of canted bases DOES NOT increase the Elevation adjustment of a scope - it merely <span style="font-style: italic">"shifts"</span> a portion of the scope's Elevation adjustment (20 MOA on a 20 MOA base) from the low end of the adjustment range to the upper end of the adjustment range. <span style="font-style: italic">Remember:</span> The center line of the scope sits 1.5-2.0"+ above the center of the bore, so a fair amount of "UP" adjustment is used when zeroing a rifle with a 0 MOA ("flat") base, which reduces the amount of remaining "UP" adjustment.
Canted bases angle the front of the scope downward so that the scope's line-of-sight (LOS) and the bullet's point-of-impact (POI) merge. This reduces the amount of "UP" adjustment required to zero. This "extra" 20 MOA of Elevation adjustment can help extend the range of the useful range of the rifle.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Delta271</div><div class="ubbcode-body">... and do you have to sight in or range it differently, when using the mil-dot is your calculation different than the zero? </div></div>
If you don't turn the scope adjustments back to the factory settings when you change from the 0 MOA base to the 20 MOA base, as <span style="font-weight: bold"><span style="font-style: italic">gstaylorg</span></span> said - you will likely be high before you re-zero. Other than that you zero the rifle as usual. Your drop calculations will remain the same - 20 MOA of cant is only 1/3 of one degree, which has very little effect when plugged into ballstics calculators such as the <span style="font-weight: bold"><span style="font-style: italic"> JBM Small Arms Ballistics Trajectory Calculator </span></span>, as well as in the real world.
Keith
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Delta271</div><div class="ubbcode-body">I am new to the long range shooting world, and I am building a new rifle, my last rifle had a zero rail, my question is what is the advantage to having the 20 MOA? more adjustment??</div></div>
For clarification, the use of canted bases DOES NOT increase the Elevation adjustment of a scope - it merely <span style="font-style: italic">"shifts"</span> a portion of the scope's Elevation adjustment (20 MOA on a 20 MOA base) from the low end of the adjustment range to the upper end of the adjustment range. <span style="font-style: italic">Remember:</span> The center line of the scope sits 1.5-2.0"+ above the center of the bore, so a fair amount of "UP" adjustment is used when zeroing a rifle with a 0 MOA ("flat") base, which reduces the amount of remaining "UP" adjustment.
Canted bases angle the front of the scope downward so that the scope's line-of-sight (LOS) and the bullet's point-of-impact (POI) merge. This reduces the amount of "UP" adjustment required to zero. This "extra" 20 MOA of Elevation adjustment can help extend the range of the useful range of the rifle.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Delta271</div><div class="ubbcode-body">... and do you have to sight in or range it differently, when using the mil-dot is your calculation different than the zero? </div></div>
If you don't turn the scope adjustments back to the factory settings when you change from the 0 MOA base to the 20 MOA base, as <span style="font-weight: bold"><span style="font-style: italic">gstaylorg</span></span> said - you will likely be high before you re-zero. Other than that you zero the rifle as usual. Your drop calculations will remain the same - 20 MOA of cant is only 1/3 of one degree, which has very little effect when plugged into ballstics calculators such as the <span style="font-weight: bold"><span style="font-style: italic"> JBM Small Arms Ballistics Trajectory Calculator </span></span>, as well as in the real world.
Keith
Re: O MOA rail vs 20 MOA Rail - sighting in diff
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Petey</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mattlewis</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: gstaylorg</div><div class="ubbcode-body">Just be aware when you first sight it in, you will likely be 15-20" <span style="font-style: italic">high</span> at 100 yd. This is because the base will have the built-in downward cant of 20 MOA.</div></div>
i don't understand this? do you mean if you don't bore site and just guess? not a flame, just trying to understand more about something new to me.
looks like if you bore site, it's a wash?</div></div>
You are correct. <span style="color: #FF0000">He was assuming a hypothetical situation where the OP would take the optic/mount off his current 0MOA rifle and install it on his new 20MOA gun.</span>
Boresight is boresight. The type of rail makes no difference; they all boresight the same. </div></div>
This. I personally have never found it necessary to boresight when mounting a new scope or replacing one with another. I've done it often enough that I have a pretty solid idea of where the POI will be. Close enough at least to be on at 100 yd. If you're familiar with how a rifle behaves when switching between scopes/mounts and you understand the trigonometry, it's pretty simple to get it reasonably close at 100 yd without boresighting. Actually, it's probably more accurate to say I'm just too lazy to boresight if I don't have to (LOL).
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Petey</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mattlewis</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: gstaylorg</div><div class="ubbcode-body">Just be aware when you first sight it in, you will likely be 15-20" <span style="font-style: italic">high</span> at 100 yd. This is because the base will have the built-in downward cant of 20 MOA.</div></div>
i don't understand this? do you mean if you don't bore site and just guess? not a flame, just trying to understand more about something new to me.
looks like if you bore site, it's a wash?</div></div>
You are correct. <span style="color: #FF0000">He was assuming a hypothetical situation where the OP would take the optic/mount off his current 0MOA rifle and install it on his new 20MOA gun.</span>
Boresight is boresight. The type of rail makes no difference; they all boresight the same. </div></div>
This. I personally have never found it necessary to boresight when mounting a new scope or replacing one with another. I've done it often enough that I have a pretty solid idea of where the POI will be. Close enough at least to be on at 100 yd. If you're familiar with how a rifle behaves when switching between scopes/mounts and you understand the trigonometry, it's pretty simple to get it reasonably close at 100 yd without boresighting. Actually, it's probably more accurate to say I'm just too lazy to boresight if I don't have to (LOL).
