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I turned my 0.25 moa rifle into a 12 moa rifle - Help!!!!

bubbapug1

I own an excellent Elisio R5 with a 700 action chambered in 6mm BR. The gun has been a proven performer, even if I am only a so so wind reader and semi hard holder.





I was going to use the gun for a recent 1000 yard match at R117 on Pendleton when I discovered I didn't have enough elevation with the current base and scope combo to reach out that far.


After I shot the match with another gun I took the base off the Elisio and milled about 0.034 off at a tape to get me the 20 moa I was short.


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The first range trip to test the gun was a disaster. The gun was shooting close to 20” groups, at least with the bullet holes I could find. There were some machining marks on the bottom of the base, and I suspected those caused the base to move. I once again took off the base and carefully surfaced it.


[URL=http://s481.photobucket.com/user/bubbapug1/media/base%202_zpsrl7flmhm.jpg.html]


The base is super flat, and seems to tighten down tight. However, upon testing it again today the gun is shooting 12” groups at 100 yards(more or less, usually more). I tried a different scope just to make sure the scope wasn’t the issue. The problem doesn’t change with scopes!!


Needless to say, I am disraught that my BEST shooter is now my worst shooter, and I am the one who ruined it.


My question is, would it be possible to bed the mount to insure a solid fit into the R5 chassis? I am almost certain the base is moving, and it’s also the only variable between ½ moa performance and the new 12 moa shooting.[/URL]
 
Bedding almost always works but only fixes the joint you are bedding. I would also check to make sure my screws aren't bottoming out resulting in it feeling tight but the base isn't tight. Also, make sure the scope isn't making contact in front of the base with the increased tilt. Really sounds like something is very loose. Send me a PM next 1000 yd match there and I'll come either shoot or watch. I've been meaning to get out there. --Jerry
 
If I had to bet, I would say that you may have one or more base mounting screws bottoming. If that is happening just a little, you think that you have the base tight, but you really do not have much clamping at all because the tip of the screw is bottomed just a little, but not so much that it is obvious with a gap between the base and what it is mounted to, in your case a tube, in most, the receiver. The cure it to shorten screws a bit. The test is to count the turns and fractions of a turn from the exact point of engagement, with and without the base. There needs to be at least a half turn less for each with the base in place.
 
BoydAllen said:
If I had to bet, I would say that you may have one or more base mounting screws bottoming. If that is happening just a little, you think that you have the base tight, but you really do not have much clamping at all because the tip of the screw is bottomed just a little, but not so much that it is obvious with a gap between the base and what it is mounted to, in your case a tube, in most, the receiver. The cure it to shorten screws a bit. The test is to count the turns and fractions of a turn from the exact point of engagement, with and without the base. There needs to be at least a half turn less for each with the base in place.
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I checked for this issue. The screws are threaded through the frame and can be turned down another 1/8" further than they are now with the machined base. The only screw which could have any interference is the rear one, and that's because it would run into the end of the bolt. I am pulling my hair out, and I don't really have a lot to pull out!!
 
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Did bringing the front of the scope down bring it into contact with the handguard? What kind of clearance do you have there?
 
I have milled more than a few of Gary's rails down and never had an issue. Something has to be binding or loose. I had to shorten a screw to keep it from hitting the action.

John
 
Never mess with a precision built base. Shim and bed the scope rings. Much easier to do and easier to undo if you screw up
 
jkl said:
I have milled more than a few of Gary's rails down and never had an issue. Something has to be binding or loose. I had to shorten a screw to keep it from hitting the action.

John
Click to expand...


The mill job may not be flat. In this case skim bedding should fix. If you're near carlsbad you can bring it over and I can look at it.
 
I made a jig to hold it and placed a feeler gauge under the end. The first one I did was for German Salazar when he switched to FTR. No issues.

John
 
His load recipe probably don't wanna work at 1K. It's a whole different ball game when you go long. Just cuz a load shoots good at 300 to 600 yards don't guarantee it's gonna be accurate at 1K. Gotta do load testing at 1K
 
Ledd Slinger said:
His load recipe probably don't wanna work at 1K. It's a whole different ball game when you go long. Just cuz a load shoots good at 300 to 600 yards don't guarantee it's gonna be accurate at 1K. Gotta do load testing at 1K
Click to expand...

I interpreted his post as after he modified the rail, he went to the range to sight it in at short distance and got bad results.

My guess is something was loose. Now that he's been through it multiple times it will be all good. The old "I took it apart and put it back together and now it works" solution.
 
carlsbad said:
I interpreted his post as after he modified the rail, he went to the range to sight it in at short distance and got bad results.

My guess is something was loose. Now that he's been through it multiple times it will be all good. The old "I took it apart and put it back together and now it works" solution.
Click to expand...

Oh ok. That would make more sense. Read it again and saw in his post about 12" groups at 100 yards.

I was thinking he milled his 20 MOA sighted it in, then went to 1K and was all over the paper.
 
Our Elisio bases are pinned as well as screwed down because the screws have some play for windage. Did you re-pin your base?

To have a group go that bad I'm thinking something has to be loose. Even if there was a pressure point it should still shoot "ok" off call somewhere. A 12 moa group is a shotgun pattern. That's like the barrel is unscrewing or the base is loose and flopping around.
 
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