Scope Elevation Issues!

[DaveMarine1]

I am mounting a Vortex Viper PST on a Ruger Precision Rifle. It has the integrated 20MOA base on it and I used initially the Burris PEPR once piece base to mount the scope. I sighted in at 100 yards and I am almost maxed out of elevation. I have roughly 17 MOA left. Obviously that is enough for most but I will be shooting steel out to 1000 and past which will require more elevation.
I come to the conclusion that with the 20 MOA rail and the high mounting of the PEPR base/rings created too much of an angel which in turn caused the scope to be almost maxed out at 100 yds.

I am thinking of getting a different one piece base, such as from Nightforce and using that. Or perhaps even just getting a set of high rings and using them.

My question is this:
Am I right in thinking that the high mounting of the scope on the 20moa rail is too much causing me to dial alot of MOA at 100? And also, by adding high rings, or a different one piece base that obviously does not have moa built into it, will this correct my problem and give me more of a 100 yard zero that is in the middle of the scopes adjustments?

Any info will be greatly appreciated. Thanks in advance!

David

 

[BoydAllen]

Burris has recently come out with some tactical rings that have inserts that come in offsets as great as .020". Using these you should be able to solve your problem. The high rings are not the source of your problem. If you do a little sketching and visualizing, I think that you can figure out why.

 

[DaveMarine1]

Burris has recently come out with some tactical rings that have inserts that come in offsets as great as .020". Using these you should be able to solve your problem. The high rings are not the source of your problem. If you do a little sketching and visualizing, I think that you can figure out why.

I suppose one other thing to is that the PST only has 65 MOA and that this is as good as it gets being the high mounts on the 20moa shouldn't be effecting anything.

 

[savagedasher]

Burris has recently come out with some tactical rings that have inserts that come in offsets as great as .020". Using these you should be able to solve your problem. The high rings are not the source of your problem. If you do a little sketching and visualizing, I think that you can figure out why.

I would check the scope rings they should meisure the same.
Next try another scope.
If another scope corrects the problem it the scope
20 MOA bases work on all my guns. Larry

 

[DaveMarine1]

I would check the scope rings they should meisure the same.
Next try another scope.
If another scope corrects the problem it the scope
20 MOA bases work on all my guns. Larry

Thanks Larry I will see what I can do. I checked and I have 24 MOA left after my 100 yd zero. Not enough for a .243 and 105's to get out to 1000 yds.

 

[savagedasher]

Thanks Larry I will see what I can do. I checked and I have 24 MOA left after my 100 yd zero. Not enough for a .243 and 105's to get out to 1000 yds.

Nothing a strip of shim stock won't cure . Larry.

 

[dkhunt14]

Height of rings has nothing to do with the 20MOA base. 20 minutes is 20 minutes whether mounted with low rings or high ones. Something else is wrong. A 20 minute base should put your 100 yard zero below the middle adjustment range. I don't like shimming scopes because I believe you can put stress in your scope, which can give other problems. I would get the Burris rings with the inserts and bring your zero down. I like my zero to be close to the bottom so when I am at 1000 I have plenty left. Matt

 

[DaveMarine1]

Height of rings has nothing to do with the 20MOA base. 20 minutes is 20 minutes whether mounted with low rings or high ones. Something else is wrong. A 20 minute base should put your 100 yard zero below the middle adjustment range. I don't like shimming scopes because I believe you can put stress in your scope, which can give other problems. I would get the Burris rings with the inserts and bring your zero down. I like my zero to be close to the bottom so when I am at 1000 I have plenty left. Matt

I will probably just change out the scope to a Nightforce I have and see if that improves. I am just beginning to think that the PST just doesn't have enough elevation....BUT....the PST has 65 MOA total elevation. With the 20MOA rail, it should now have 85 MOA total elevation, thats no different than say a NF SHV with 90 MOA. I don't know. Probably just need to stick with the brands that have been working for me in the past. I will do some looking into. Thanks for all of the help.

 

[savagedasher]

I will probably just change out the scope to a Nightforce I have and see if that improves. I am just beginning to think that the PST just doesn't have enough elevation....BUT....the PST has 65 MOA total elevation. With the 20MOA rail, it should now have 85 MOA total elevation, thats no different than say a NF SHV with 90 MOA. I don't know. Probably just need to stick with the brands that have been working for me in the past. I will do some looking into. Thanks for all of the help.

Your are correct . But the close the scope is mounted to the center of the bore the more distance of come up the scope will have. Larry

 

[skiutah02]

I will probably just change out the scope to a Nightforce I have and see if that improves. I am just beginning to think that the PST just doesn't have enough elevation....BUT....the PST has 65 MOA total elevation. With the 20MOA rail, it should now have 85 MOA total elevation, thats no different than say a NF SHV with 90 MOA. I don't know. Probably just need to stick with the brands that have been working for me in the past. I will do some looking into. Thanks for all of the help.

Similar issue solved with the Burris Sig Zee Rings. Hope this helps. Drew

http://forum.accurateshooter.com/th...308-to-do-100yds-shots.3865759/#post-36571839

 

[Jayman_10x]

I am mounting a Vortex Viper PST on a Ruger Precision Rifle. It has the integrated 20MOA base on it and I used initially the Burris PEPR once piece base to mount the scope. I sighted in at 100 yards and I am almost maxed out of elevation. I have roughly 17 MOA left. Obviously that is enough for most but I will be shooting steel out to 1000 and past which will require more elevation.
I come to the conclusion that with the 20 MOA rail and the high mounting of the PEPR base/rings created too much of an angel which in turn caused the scope to be almost maxed out at 100 yds.

I am thinking of getting a different one piece base, such as from Nightforce and using that. Or perhaps even just getting a set of high rings and using them.

My question is this:
Am I right in thinking that the high mounting of the scope on the 20moa rail is too much causing me to dial alot of MOA at 100? And also, by adding high rings, or a different one piece base that obviously does not have moa built into it, will this correct my problem and give me more of a 100 yard zero that is in the middle of the scopes adjustments?

Any info will be greatly appreciated. Thanks in advance!

David[/QUOT

I am mounting a Vortex Viper PST on a Ruger Precision Rifle. It has the integrated 20MOA base on it and I used initially the Burris PEPR once piece base to mount the scope. I sighted in at 100 yards and I am almost maxed out of elevation. I have roughly 17 MOA left. Obviously that is enough for most but I will be shooting steel out to 1000 and past which will require more elevation.
I come to the conclusion that with the 20 MOA rail and the high mounting of the PEPR base/rings created too much of an angel which in turn caused the scope to be almost maxed out at 100 yds.

I am thinking of getting a different one piece base, such as from Nightforce and using that. Or perhaps even just getting a set of high rings and using them.

My question is this:
Am I right in thinking that the high mounting of the scope on the 20moa rail is too much causing me to dial alot of MOA at 100? And also, by adding high rings, or a different one piece base that obviously does not have moa built into it, will this correct my problem and give me more of a 100 yard zero that is in the middle of the scopes adjustments?

Any info will be greatly appreciated. Thanks in advance!

David

Hey David,
This may sound silly but you should check to make sure that the 20 moa base is not mounted backwards. Just make sure the raised (thicker) portion of the base is to the rear of the action, and not the front. I own the same Vortex Scope and 20 moa base should be more than enough to reach out to 1000 yards. Worth checking! Hope this helps.

 

[dkhunt14]

I will probably just change out the scope to a Nightforce I have and see if that improves. I am just beginning to think that the PST just doesn't have enough elevation....BUT....the PST has 65 MOA total elevation. With the 20MOA rail, it should now have 85 MOA total elevation, thats no different than say a NF SHV with 90 MOA. I don't know. Probably just need to stick with the brands that have been working for me in the past. I will do some looking into. Thanks for all of the help.

The 20 minute rail will not give you more MOA on your scope. What it does is lower your Point of aim so you have more minutes left. Something has to be wrong because a 20 Minute rail plus the 65 MOA in the scope should give you plenty to reach 1000 yards. Matt

 

[M-61]

Quote from RUGER site:
"20 MOA Picatinny rail secured with four, #8-40 screws for increased long-range elevation capabilities"

I have never seen this rifle and thought the 20moa was integral, but obviously not, so could it be mounted backwards as Jayman_10X said? Worth checking. As dkhunter14 said between the rail and scope there should be enough to reach 1000yds.

 

[savagedasher]

The rail must be mounted thicker part at the back of the gun Larry

 

[XTR]

Your are correct . But the close the scope is mounted to the center of the bore the more distance of come up the scope will have. Larry

There is some effect, but it shouldn't be that much. If you were centered up at 100 and you raised your scope an inch and a half you'd need to come up ~1.5MOA to get to the same POI/POA setting. That doesn't explain the issue here.

Sounds like the mount is backward, not sure if that even makes sense. It is mounting the scope forward with the nuts on the left, correct? (those were made for AR platforms to get the scope forward) if you have it turned around you are having to dial another 20MOA up to account for the base. If this is the case turn it back around and you should have about 37MOA.

 

[dkhunt14]

Your are correct . But the close the scope is mounted to the center of the bore the more distance of come up the scope will have. Larry

If you run a 6MM 105 Berger bullet 3000 feet a second. You mount the scope 1.5 inches above bore the drop at 1000 yards would be 27.18 MOA. The same velocity and just changing the scope to 2.5 above bore the drop is 26.32 MOA. It is less with the scope mounted higher. Matt

 

[XTR]

What do you mean the rifle has an integral base? But then you stated you initially used some Burris base?

Tom

This is the rifle he has:

It has a built in Pic Rail.

This is the mount he is using:

 

[Zero333]

Scope objective touching the rail ???

 

[dkhunt14]

If the 20 minutes is on the rail, is the rail split at the action? If it is maybe only the action portion has taper. If the mount wound get out on the barrel part it might take the minutes out. Can't tell by the picture. I made it as big as I can but still can't tell. Matt

 

[dkhunt14]

I went and looked the rifle has a 20 minute rail. The mount also has 20 minutes built in. If he mount is backwards it cancels the rail. Matt