Archived Posts » 59,789,155
Just figured out my M99 has a 27 minute rail......
6/30/2011 7:32:24 PM
No wonder I couldn't dial in a 100 yd zero with my Vortex PST......The Larue LT-107 mount I 'm using has an addn'l 30 minutes for a total of 57 minutes of cant. With the scope bottomed out we were still hitting about 19-20 inches high.....
Now I just gotta figure out a zero distance that will maximize the scope's internal adjustment range without bottoming out and limiting the windage adjustment......
This could take me awhile
Now I just gotta figure out a zero distance that will maximize the scope's internal adjustment range without bottoming out and limiting the windage adjustment......
This could take me awhile
7/1/2011 10:35:49 PM
With almost 60moa of cant... could you not SEE it was a little off before peering through the glass ? 
Was the front of the scope touching the barrel ?
How much adjustment does your scope have ?
I had a Leupold VX3 4.5-14 with a 30mm tube and it had 125moa worth of tuning in it. My 8.5-25 on my AR50 only has about 85moa in it.
Was the front of the scope touching the barrel ?
How much adjustment does your scope have ?
I had a Leupold VX3 4.5-14 with a 30mm tube and it had 125moa worth of tuning in it. My 8.5-25 on my AR50 only has about 85moa in it.
7/2/2011 9:21:23 AM
Originally Posted By Dragracer_Art:
With almost 60moa of cant... could you not SEE it was a little off before peering through the glass ?
Was the front of the scope touching the barrel ?
How much adjustment does your scope have ?
I had a Leupold VX3 4.5-14 with a 30mm tube and it had 125moa worth of tuning in it. My 8.5-25 on my AR50 only has about 85moa in it.
With almost 60moa of cant... could you not SEE it was a little off before peering through the glass ?
Was the front of the scope touching the barrel ?
How much adjustment does your scope have ?
I had a Leupold VX3 4.5-14 with a 30mm tube and it had 125moa worth of tuning in it. My 8.5-25 on my AR50 only has about 85moa in it.
Even with that much cant, it wasn't really obvious to the naked eye, as the scope bell sits nowhere near the barrel. The scope has 21 mils (75 MOA) of adjustment....nowhere near enough to zero at 100 yds with that much cant. Heck even that Leupold you mention would bottom out on the down adjustment at 100 yes in this setup.
7/3/2011 12:02:58 AM
It defeats the purpose of the Larue mount but if you don't need it, you could turn the mount around, negating the 30 MOA.
7/3/2011 12:28:34 AM
Sell the mount and get high rings. 30 min should be doable.
7/3/2011 9:53:24 AM
Originally Posted By Bretshooter:
Sell the mount and get high rings. 30 min should be doable.
Sell the mount and get high rings. 30 min should be doable.
I may just turn it around in the mount to negate the 30 MOA,since I need the qd capability for storage purposes.
7/3/2011 11:43:25 AM
Originally Posted By molardog:
I may just turn it around in the mount to negate the 30 MOA,since I need the qd capability for storage purposes.
Originally Posted By Bretshooter:
Sell the mount and get high rings. 30 min should be doable.
Sell the mount and get high rings. 30 min should be doable.
I may just turn it around in the mount to negate the 30 MOA,since I need the qd capability for storage purposes.
QD rings.
7/3/2011 12:45:56 PM
Originally Posted By Bretshooter:
QD rings.
Originally Posted By molardog:
I may just turn it around in the mount to negate the 30 MOA,since I need the qd capability for storage purposes.
Originally Posted By Bretshooter:
Sell the mount and get high rings. 30 min should be doable.
Sell the mount and get high rings. 30 min should be doable.
I may just turn it around in the mount to negate the 30 MOA,since I need the qd capability for storage purposes.
QD rings.
True.....I do like the one piece mount though.
7/3/2011 6:34:41 PM
Whoaaa,
Ok the LaRue rings give you +30 min and the rail is +27 min. Now some are suggesting that you reverse the rings. So now we will have -30 min on a +27 rail to give us a net of -3 min of cant to the scope. Frankly I would be looking for QD rings with no cant on them. You should then be able to dial in 100 yrds out to at least 600 yrds with a scope that has a decent range of adjustment in the vertical plane.
But the point of this post is that you are negating more than the 30 min cant
Ok the LaRue rings give you +30 min and the rail is +27 min. Now some are suggesting that you reverse the rings. So now we will have -30 min on a +27 rail to give us a net of -3 min of cant to the scope. Frankly I would be looking for QD rings with no cant on them. You should then be able to dial in 100 yrds out to at least 600 yrds with a scope that has a decent range of adjustment in the vertical plane.
But the point of this post is that you are negating more than the 30 min cant
7/3/2011 8:00:02 PM
How far are you usually shooting??
Zero at 200 or 300 and use your mils for everything closer
Zero at 200 or 300 and use your mils for everything closer
7/4/2011 10:21:58 AM
Originally Posted By Max-Paul:
Whoaaa,
Ok the LaRue rings give you +30 min and the rail is +27 min. Now some are suggesting that you reverse the rings. So now we will have -30 min on a +27 rail to give us a net of -3 min of cant to the scope. Frankly I would be looking for QD rings with no cant on them. You should then be able to dial in 100 yrds out to at least 600 yrds with a scope that has a decent range of adjustment in the vertical plane.
But the point of this post is that you are negating more than the 30 min cant
Whoaaa,
Ok the LaRue rings give you +30 min and the rail is +27 min. Now some are suggesting that you reverse the rings. So now we will have -30 min on a +27 rail to give us a net of -3 min of cant to the scope. Frankly I would be looking for QD rings with no cant on them. You should then be able to dial in 100 yrds out to at least 600 yrds with a scope that has a decent range of adjustment in the vertical plane.
But the point of this post is that you are negating more than the 30 min cant
Understood.....I just ran the numbers with the Strlok ballistics calculator for Android. With my current setup at 57 moa of cant, I have roughly a 600 yd zero, leaving me with 4 mils of hold under at 100 yds. That's with scope elevation bottomed out, allowing me to use the scope's full elevation range of 21 mils to get to about 1850 yds.
According to the calculator, a 690 gr projo will go subsonic at roughly 1550 yds, fwiw.
7/4/2011 10:22:50 AM
Originally Posted By ALASKANFIRE:
How far are you usually shooting??
Zero at 200 or 300 and use your mils for everything closer
How far are you usually shooting??
Zero at 200 or 300 and use your mils for everything closer
300 most of the time, I anticipate.
7/4/2011 8:43:01 PM
One other thought to keep in mind. You are going to get a better sight picture with the erector tube closer to true center in the scope. So operation at either far top or far bottom is not going to produce as clear of an image.
7/4/2011 10:06:05 PM
Max-Paul, you're right about reversing the Larue mount. I really wasn't thinking about the math at all when I suggested it and I do agree that it would be a very less than ideal solution. All I was thinking about was this thread and Mark Larue's reply. M99 / LT-107 zero issue
M99 / LT-107 zero issue7/4/2011 10:46:00 PM
Originally Posted By 808Sig:
Max-Paul, you're right about reversing the Larue mount. I really wasn't thinking about the math at all when I suggested it and I do agree that it would be a very less than ideal solution. All I was thinking about was this thread and Mark Larue's reply. M99 / LT-107 zero issue
Max-Paul, you're right about reversing the Larue mount. I really wasn't thinking about the math at all when I suggested it and I do agree that it would be a very less than ideal solution. All I was thinking about was this thread and Mark Larue's reply.
M99 / LT-107 zero issueI read that thread....looks like that OP has a 27 min rail too. Dumbass me didn't even bother to check it before I bought the larue mount. In light of everything that's been said, I may send it back to Larue in exchange for the qd rings he makes.
7/4/2011 10:47:06 PM
Originally Posted By Max-Paul:
One other thought to keep in mind. You are going to get a better sight picture with the erector tube closer to true center in the scope. So operation at either far top or far bottom is not going to produce as clear of an image.
One other thought to keep in mind. You are going to get a better sight picture with the erector tube closer to true center in the scope. So operation at either far top or far bottom is not going to produce as clear of an image.
No doubt that is a consideration I hadn't thought of.
7/5/2011 11:39:03 AM
Originally Posted By molardog:
No doubt that is a consideration I hadn't thought of.
Originally Posted By Max-Paul:
One other thought to keep in mind. You are going to get a better sight picture with the erector tube closer to true center in the scope. So operation at either far top or far bottom is not going to produce as clear of an image.
One other thought to keep in mind. You are going to get a better sight picture with the erector tube closer to true center in the scope. So operation at either far top or far bottom is not going to produce as clear of an image.
No doubt that is a consideration I hadn't thought of.
Hey, it is easier to sit back and consider what is going on, than to be in the middle of it. Been there done that. And when someone points out to me something that I have over looked. I too have done the palm to forehead thing. I am just glad to be of maybe a little help.
