Won't shoot to the point of aim

[joshb]

As we get older our thought process becomes a little foggy at times. Just have to back up and re-group to think things thru. LOL.

Thanks Fred!

 

[coldboreshot]

I sent the smith a text and am waiting for his reply. A rough measurement of the scope base-to-slot reveals about a .030" difference with the rear being taller as it should be. How much elevation would that roughly equate to? It is the factory supplied Browning base for the LR McMillan rifle in 6.5 Creed.

Well, that involves more than just the .030" at the rear measure. That particular base is machined, based on calculated measurements to produce 20moa of cant. A longer base will be different as well as a shorter base. They could however hold the same average between to two end measures. If the elevated end is at the rear then its placed correctly. Now, if what you say is correct about the previous POA set at 400 yards prior to barrel change and bedding, then the issue may lie in the new barrel fitment or something changed when reapplying the scope rings. 1 foot differential at 400 yards is basically just 3moa adjust. 12 hash marks on your 1/4 moa turret. Gonna throw someting out here but most likely improbable but any change in ammo that would cause 3moa drop?

 

[coldboreshot]

I've got a Browning Hell's Canyon LR McMillan in 6.5 Creed. The rifle wears a Swarovski 5-25 scope. It is mounted using the provided tapered pic base (20moa?) and Burris Signature rings. The rifle was sighted in at 400 yds without issue.

I decided to have a new barrel put on the rifle and had a 24" Bartlein 8 twist installed. I also had it pillar bedded while the gunsmith had it. I took it to the range yesterday and it impacts about one foot low @ 400yds with the up adjustment maxed out. What could be causing this?

Curious, what was the twist rate on the factory barrel?

 

[Charlie-NY]

Curious, what was the twist rate on the factory barrel?

The original 26" Browning barrel was an 8 twist. The new 24" Bartlein is also an 8 twist.

 

[Charlie-NY]

Gonna throw something out here but most likely improbable but any change in ammo that would cause 3moa drop?

It's actually more than a 3moa drop because in addition to the canted base I had the vertical adjustment maxed out, which wasn't necessary before. The ammo is essentially the same, shooting 140gr Bergers at 2,700+.

I'm hoping that it's just a scope adjustment error on my part. Why the scope needs a significant adjustment is anyone's guess. With a little luck, this will all work out. I won't get to the club again until next week.

 

[hpshooter]

"The more I know, the more I know that I don't know".

True for all us humans if we are mature enough to admit it. At 76 yrs on the planet I miss being 18 when I knew everything!!

 

[DShortt]

True for all us humans if we are mature enough to admit it. At 76 yrs on the planet I miss being 18 when I knew everything!!

I don't because I wasted a lot of time and ruined a bunch of stuff.

 

[WSnyder]

I don’t know where you are or what space you have around you. Maybe bore sight the thing before you head to the range? I set rifles up on a cart and can point them out the shop door at a distant insulator up high on the side of a power pole. I look down the bore at the insulator and rough the scope adjustments in so when I hit the range I’m ahead of the game. If you could do something similar you’d know ahead of time if it’s even feasible to get the scope setup. I also don’t know why you wouldn’t be able to get it where it needs to be because 1ft of adjustment @ 400yds should be easy.

 

[jelenko]

True for all us humans if we are mature enough to admit it. At 76 yrs on the planet I miss being 18 when I knew everything!!

Or, even 30

 

[Eagle Six]

Just to be specific - the scope is a Swarovski Z5 5-25x52BT. One thing that I noticed that I can't explain is the scope is supposed to have 43moa of adjustment. The elevation turret has a bit less than one revolution of adjustment from one extreme to the other. I just counted the 1/4moa clicks and get 49 from the bottom to the top. That would put it at 12moa of adjustment.

The interesting thing is that there were no issues before the work was done.

The rifle scope has a custom Swarovski turret cap. The cap was removed and the base adjustment knob was used. The knob gets full travel as viewed through a bore sighting tool. Everything with the scope seems fine. I own two of these scopes and they both have similar travel.

These statements seem to conflict. If everything was fine, wouldn't you get at least close to the claimed 43 MOA adjustment?



If it were me, I would follow @bugman's suggestion...

MECHANICALLY rezero the elevation and windage turrets on that scope. Then find the optical zero as usual.

If during this process I found as you have that the extreme adjustment stops only allow for 24 MOA, I would be placing a call to service and support and question the source about this discrepancy.



Then @WSnyder.......

I don’t know where you are or what space you have around you. Maybe bore sight the thing before you head to the range? I set rifles up on a cart and can point them out the shop door at a distant insulator up high on the side of a power pole. I look down the bore at the insulator and rough the scope adjustments in so when I hit the range I’m ahead of the game. If you could do something similar you’d know ahead of time if it’s even feasible to get the scope setup. I also don’t know why you wouldn’t be able to get it where it needs to be because 1ft of adjustment @ 400yds should be easy.

I would use something as close to 100 yards if possible. Once bore sighted I would then count the MOA up and down, and left to right. If your scope has 24 MOA stop to stop elevation, and you have a 20 MOA base, and the scopes mechanical center is close, you should only have a couple MOA down, after a bore sight at 100 yards and about 20 MOA up which should get the bullet out to about 800 yards.

Although you very well may have an issue with the barrel/bedding work, I'm suspicious of the scope/mount/zero end of it from what has been said.

 

[Charlie-NY]

Although you very well may have an issue with the barrel/bedding work, I'm suspicious of the scope/mount/zero end of it from what has been said.

I think the barrel/bedding work is fine and the issue is an operator/scope issue.

 

[Sniperhandle]

43 moa of adjustment is pretty pathetic, Not trying to insult you or your optic, But I hope it has more than that. This may explain why you are running out of adjustment.

Just to be specific - the scope is a Swarovski Z5 5-25x52BT. One thing that I noticed that I can't explain is the scope is supposed to have 43moa of adjustment. The elevation turret has a bit less than one revolution of adjustment from one extreme to the other. I just counted the 1/4moa clicks and get 49 from the bottom to the top. That would put it at 12moa of adjustment.

The interesting thing is that there were no issues before the work was done.

 

[hpshooter]

I don't because I wasted a lot of time and ruined a bunch of stuff.

Truthfully, I did also.

 

[Charlie-NY]

43 moa of adjustment is pretty pathetic, Not trying to insult you or your optic, But I hope it has more than that. This may explain why you are running out of adjustment.

43moa plus the 20moa rail should get me to the moon & back.

Running out of adjustment was explained already.