I just tried to sight my 700 .308 in and ran into an issue. My setup is as follows: SPS-V in HS precision stock, weaver 3-15x50 tactical, warne medium fixed rings and a standard 0 moa rail. I started shooting prone @ 50 yards to get it on paper really quick. But even at 50 it was shooting 2.5-3 foot low so i adjusted the scope up, alot. Got it dialed in backed out to 100 and it was about 18 inches low, dialed it up and shot about 2 inches high. But i ran out of adjustment. The scope was dialed all the way up. So my thinking is i need to put a 20 moa base on the rifle then back to the range. Does this sound right? Or is a 20 moa not enough in this case? I want to leave as much elevation adjustment as possible in the scope once it's mounted. The weaver I have has 80 moa of internal adjustment and was tracking right when i shot the rifle.
Rifle Scopes 20 moa base question
- Thread starter bornhunter04
- Start date
Re: 20 moa base question
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Force_Multiplier</div><div class="ubbcode-body">you don't need a 20 MOA base, something else is screwed </div></div>
AGREE!!
even if you had a 20moa base mounted backwards you would get better results than your getting.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Force_Multiplier</div><div class="ubbcode-body">you don't need a 20 MOA base, something else is screwed </div></div>
AGREE!!
even if you had a 20moa base mounted backwards you would get better results than your getting.
Re: 20 moa base question
any idea what could be wrong? Everything's torqued to spec. When i'd adjust the scope it would track to the proper place.
any idea what could be wrong? Everything's torqued to spec. When i'd adjust the scope it would track to the proper place.
Re: 20 moa base question
It feels like we had the same question two days ago
http://www.snipershide.com/forum/ubbthre...483#Post3100483
Something is raising your scope tube ~0.050" at the front ring or lowering it in the rear:
Rings don't match.
Something under the mount in front.
Shim in the bottom of the front ring.
It feels like we had the same question two days ago
http://www.snipershide.com/forum/ubbthre...483#Post3100483
Something is raising your scope tube ~0.050" at the front ring or lowering it in the rear:
Rings don't match.
Something under the mount in front.
Shim in the bottom of the front ring.
Re: 20 moa base question
hmm no shims, rings not lapped. These are new rings..... Just mounted the scope last week.... First time ive had a chance to shoot it.
hmm no shims, rings not lapped. These are new rings..... Just mounted the scope last week.... First time ive had a chance to shoot it.
Re: 20 moa base question
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Force_Multiplier</div><div class="ubbcode-body">you don't need a 20 MOA base, something else is screwed </div></div> I agree absolutely, how could a .308 setup zeroed in a 50 yds. shoot 18" low at 100 yds? For that to happen, you would have to have -35.5 MOA relationship between your POA and trajectory (POI.) I guess if your flat base was actually a 35 MOA base mounted backwards, or MOA rings mounted backwards it's possible but I'm sure you don't have that problem.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Force_Multiplier</div><div class="ubbcode-body">you don't need a 20 MOA base, something else is screwed </div></div> I agree absolutely, how could a .308 setup zeroed in a 50 yds. shoot 18" low at 100 yds? For that to happen, you would have to have -35.5 MOA relationship between your POA and trajectory (POI.) I guess if your flat base was actually a 35 MOA base mounted backwards, or MOA rings mounted backwards it's possible but I'm sure you don't have that problem.
Re: 20 moa base question
Try switching your front and back rings. It'll at least tell you if your rings are the culprit. If you have the same problem- you've at least narrowed down the list. If problem goes away- your rings are the issue.
Try switching your front and back rings. It'll at least tell you if your rings are the culprit. If you have the same problem- you've at least narrowed down the list. If problem goes away- your rings are the issue.
Re: 20 moa base question
If you can set up in the bags at home, and boresight, you can troubleshoot without going to the range.
That is part of why I like the Leupold zero point so much, I don't need daylight.
If you can set up in the bags at home, and boresight, you can troubleshoot without going to the range.
That is part of why I like the Leupold zero point so much, I don't need daylight.
Re: 20 moa base question
Not sure, what make the base is, it's whatever my gunsmith had on hand, probably a weaver if i had to guess. The rings are warne maxima's, medium height.
I'll try swapping the rings back around.
Clark-
I have a leupold bore sighter somewhere.... How would i use the grid to toubleshoot?
Not sure, what make the base is, it's whatever my gunsmith had on hand, probably a weaver if i had to guess. The rings are warne maxima's, medium height.
I'll try swapping the rings back around.
Clark-
I have a leupold bore sighter somewhere.... How would i use the grid to toubleshoot?
Re: 20 moa base question
Take off the top halves of the rings, and rotate the scope. Adjust the turrets until the center of the cross hairs stays on the same spot on the Leupold zero point image. The reticule is now in the center of the tube. You would like that to appear on the bullseye of the zero point, or 20 moa low, if you prefer. You can shim the mount until, when the screws are tight, the cross hairs are in the right spot.
That fixes it.
But to troubleshoot, use the centered scope, and note where the cross hairs fall on the image. Now swap rings see if they are matched, by noting if the cross hairs are on the same spot.
Or try before and after swapping mounts.
Or try a different centered scope.
Take off the top halves of the rings, and rotate the scope. Adjust the turrets until the center of the cross hairs stays on the same spot on the Leupold zero point image. The reticule is now in the center of the tube. You would like that to appear on the bullseye of the zero point, or 20 moa low, if you prefer. You can shim the mount until, when the screws are tight, the cross hairs are in the right spot.
That fixes it.
But to troubleshoot, use the centered scope, and note where the cross hairs fall on the image. Now swap rings see if they are matched, by noting if the cross hairs are on the same spot.
Or try before and after swapping mounts.
Or try a different centered scope.
Re: 20 moa base question
You may need to bed or shim your scope base. Remove the two rear base screws and see if you have a gap between the action and base. Do the same for the front. If you have any gaps you'll need to decide to either bed or shim the base.
You may need to bed or shim your scope base. Remove the two rear base screws and see if you have a gap between the action and base. Do the same for the front. If you have any gaps you'll need to decide to either bed or shim the base.
Re: 20 moa base question
Clark-
What do you mean by rotate the scope in the rings? Do a full revolution with the scope in the rings? Also, the rings i have are split down the middle (i.e. vertical halves). But i see what your saying with the grid on the boresighter, so i'll try that first. Before i do anything and check the mount.
Appreciate all the advice i'll refer back once i've checked it and have got an idea of what the hell is up w/ my rifle.
Clark-
What do you mean by rotate the scope in the rings? Do a full revolution with the scope in the rings? Also, the rings i have are split down the middle (i.e. vertical halves). But i see what your saying with the grid on the boresighter, so i'll try that first. Before i do anything and check the mount.
Appreciate all the advice i'll refer back once i've checked it and have got an idea of what the hell is up w/ my rifle.
Re: 20 moa base question
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bornhunter04</div><div class="ubbcode-body">Clark-
What do you mean by rotate the scope in the rings? .. </div></div>
I was going to make a video of my rotation method, but I did a search to see if someone has already done that.
I found another technique. This guy presses the objective of the scope against a mirror and sees two reticules.
My technique may still have some value for something, but his is sure easier.
<object width="425" height="350"> <param name="movie" value="http://www.youtube.com/v/-A3GwfB0Yg8"></param> <param name="wmode" value="transparent"></param> <embed src="http://www.youtube.com/v/-A3GwfB0Yg8" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"> </embed></object>
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bornhunter04</div><div class="ubbcode-body">Clark-
What do you mean by rotate the scope in the rings? .. </div></div>
I was going to make a video of my rotation method, but I did a search to see if someone has already done that.
I found another technique. This guy presses the objective of the scope against a mirror and sees two reticules.
My technique may still have some value for something, but his is sure easier.
<object width="425" height="350"> <param name="movie" value="http://www.youtube.com/v/-A3GwfB0Yg8"></param> <param name="wmode" value="transparent"></param> <embed src="http://www.youtube.com/v/-A3GwfB0Yg8" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"> </embed></object>
Re: 20 moa base question
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Clark</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bornhunter04</div><div class="ubbcode-body">Clark-
What do you mean by rotate the scope in the rings? .. </div></div>
I was going to make a video of my rotation method, but I did a search to see if someone has already done that.
I found another technique. This guy presses the objective of the scope against a mirror and sees two reticules.
My technique may still have some value for something, but his is sure easier.
<object width="425" height="350"> <param name="movie" value="http://www.youtube.com/v/-A3GwfB0Yg8"></param> <param name="wmode" value="transparent"></param> <embed src="http://www.youtube.com/v/-A3GwfB0Yg8" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"> </embed></object> </div></div>
Okay, I see what your saying now. I'll check my rings w/ the boresighter and do this and report back. THanks.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Clark</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bornhunter04</div><div class="ubbcode-body">Clark-
What do you mean by rotate the scope in the rings? .. </div></div>
I was going to make a video of my rotation method, but I did a search to see if someone has already done that.
I found another technique. This guy presses the objective of the scope against a mirror and sees two reticules.
My technique may still have some value for something, but his is sure easier.
<object width="425" height="350"> <param name="movie" value="http://www.youtube.com/v/-A3GwfB0Yg8"></param> <param name="wmode" value="transparent"></param> <embed src="http://www.youtube.com/v/-A3GwfB0Yg8" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"> </embed></object> </div></div>
Okay, I see what your saying now. I'll check my rings w/ the boresighter and do this and report back. THanks.
Re: 20 moa base question
Do you have clearance under your objective bell? Do you have the tools to take it all apart and redo the mounting?
That would be my first step. Take it apart, clean it all then remount it. Check all tolerances you can. Remount the scope and make sure its not hitting the barrel.
Something aint right. Could just be a bad barrel. I had a similar problem on an SPS tactical (first bolt rifle, first remington), and was shooting just like yours is. I had to send mine back and have a new barrel put in.
Just a few thoughts.
Do you have clearance under your objective bell? Do you have the tools to take it all apart and redo the mounting?
That would be my first step. Take it apart, clean it all then remount it. Check all tolerances you can. Remount the scope and make sure its not hitting the barrel.
Something aint right. Could just be a bad barrel. I had a similar problem on an SPS tactical (first bolt rifle, first remington), and was shooting just like yours is. I had to send mine back and have a new barrel put in.
Just a few thoughts.
Re: 20 moa base question
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ogreshooter</div><div class="ubbcode-body">Do you have clearance under your objective bell? Do you have the tools to take it all apart and redo the mounting?
That would be my first step. Take it apart, clean it all then remount it. Check all tolerances you can. Remount the scope and make sure its not hitting the barrel.
Something aint right. Could just be a bad barrel. I had a similar problem on an SPS tactical (first bolt rifle, first remington), and was shooting just like yours is. I had to send mine back and have a new barrel put in.
Just a few thoughts. </div></div>
Yes i have clearance under the bell, maybe 1/4" or so. yes i can take it all apart and put it back together. I've had other scopes on this rifle, but this is the fist 30mm tube scope, thus new rings. Rifle shot fine, but if it's an issue w/ the rings or the base it might not have presented itself before with other scopes as i was only interested in a 100 yard zero.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ogreshooter</div><div class="ubbcode-body">Do you have clearance under your objective bell? Do you have the tools to take it all apart and redo the mounting?
That would be my first step. Take it apart, clean it all then remount it. Check all tolerances you can. Remount the scope and make sure its not hitting the barrel.
Something aint right. Could just be a bad barrel. I had a similar problem on an SPS tactical (first bolt rifle, first remington), and was shooting just like yours is. I had to send mine back and have a new barrel put in.
Just a few thoughts. </div></div>
Yes i have clearance under the bell, maybe 1/4" or so. yes i can take it all apart and put it back together. I've had other scopes on this rifle, but this is the fist 30mm tube scope, thus new rings. Rifle shot fine, but if it's an issue w/ the rings or the base it might not have presented itself before with other scopes as i was only interested in a 100 yard zero.
