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Old February 29, 2020, 10:09 AM   #51
stagpanther
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Don't be concerned about the scope and collimator axes height above bore axis; doesn't matter. Tell me your collimator make and model and I'll explain why.
I think I already know the answer to that--it's a BSA with arbors and the glass on it is pretty crappy--though to it's credit the 1 to 4" grid @ 100 yds does match exactly to the MOA clicks on my loopy. The problem is when the scope is mounted to a canted 20 MOA rail, the grid shifts to the upper half of the field of view, so you can't really measure much of the elevation of the scope to the grid before your dial up drops below the grid.
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Old February 29, 2020, 10:20 AM   #52
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Read the last paragraph in post #13 on this thread. Let me know if you don't understand it.
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I may have found the issue. When I mounted the scope, I must have inadvertently slid the scope back on the rifle. I normally mount my front ring edge about an eighth of an inch from where the tube begins to transition into the Objective. I noticed thee edge of the front ring was right on that datum line. I can not be 100% certain that the edge of the ring being on that datum line did not can't the scope up slightly at the front. It couldn't have been more than a couple thousandths of an inch I don't think. I don't think that it would cause a 60 minute of angle or so change. A change that large would be easily seen by someone looking for it.
@Bart--perhaps I don't understand that correctly--I thought I responded to that in the next post I did. My take on that is putting a pressure point on the juncture of the tube and objective bell not only most likely will result in an asymmetry on the tube body of the scope--but can easily damage the internal mechanisms of the scope if there is enough torque provided by the rings. I ruined a scope to prove it.
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Last edited by stagpanther; February 29, 2020 at 10:27 AM.
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Old February 29, 2020, 11:23 AM   #53
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Originally Posted by kilotanker22 View Post
Yes, the windage is nearly exact and the elevation is 10MOA below the scope's center of adjustment on the turrets.
The scope's line of sight axis is typically not on the outer tube's axis when those knobs are midpoint in their mechanical limits.

With the adjustments so set, do the 2 V block test to see how much the reticle circles around. Change the adjustments to where the reticle center stays at one place as the scope's spun around.
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Old February 29, 2020, 11:35 AM   #54
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There's typically nothing near the main tubes junction to the slope on the objective bell that a couple thousandths outer tube dimension will change.
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Old February 29, 2020, 11:40 AM   #55
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There's nothing near the main tubes junction to the slope on the objective bell that a couple thousandths dimension will change.
OK--but if the entire scope body is under asymmetric pressure--can that not also affect other parts of the scope even if it is not in direct proximity of the scope ring "pressure point.?" Sorta like bending a stick between your hands--it may not necessarily break at your hand.
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Old February 29, 2020, 12:52 PM   #56
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At the range now. Just fired the first shots since setting it all up again.

From boresight, windage was 4.25 MOA to the right. Elevation from boresight was dead on at 100 yards. Did not even need to adjust the elevation.
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Old February 29, 2020, 01:11 PM   #57
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Got a perfect zero now with the ammo I am shooting now. I am burning up some Winchester range OTM ammo for brass. For a dead on zero at 100 yards from boresight I had to adjust 4.25 MOA left and .75 MOA down.
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Old February 29, 2020, 01:20 PM   #58
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This is on the 20 MOA base? How much dial up elevation do you have (assuming 100 yd zero)?
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Old February 29, 2020, 01:23 PM   #59
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Trying some handloads with a 140 eldm and rl 26. Shifts my poi to 2 moa high at
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Old February 29, 2020, 01:27 PM   #60
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Originally Posted by stagpanther View Post
This is on the 20 MOA base? How much dial up elevation do you have (assuming 100 yd zero)?
Yes, 20 MOA base and 100 yard zero. With this ammunition I have 41.75 MOA of Up adjustment. It would be really nice if I can find a 30 or 35 MOA base for this rifle. A 35 MOA base should give me around 57 MOA of up adjustment. And hopefully leave me just enough down adjustment to zero at 100 yards
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Old February 29, 2020, 01:35 PM   #61
Bart B.
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That BSA collimator is the same as my Sweeney Site Align, its optical axis is parallel with the installed spud. Scopes then bore sighted to Infinity even if if its tilted.
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Old February 29, 2020, 01:42 PM   #62
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The 140 grain eldm and rl 26 load is showing some promise. Just shot what looks like a .3-.4" 5 round group with it. I will measure it when I get home.
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Old February 29, 2020, 01:45 PM   #63
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It's about time to put this rifle away for the day though. It is bitter cold and windy today and I still need to sight in my 6.5 PRC.
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Old February 29, 2020, 02:13 PM   #64
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Amazing. Take a simple endeavor like shooting a gun, try to turn it into a science and everything falls apart. Absolutely amazing!
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Old February 29, 2020, 02:21 PM   #65
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Amazing. Take a simple endeavor like shooting a gun, try to turn it into a science and everything falls apart. Absolutely amazing!
What was it Hornady used to say? "It really is rocket science"? Something like that anyway
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Old February 29, 2020, 02:39 PM   #66
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That 140 eldm load measured .473 outside to outside. So .209" center to center. Might be a fluke, but definitely worth looking into I think. Looks like only 3 identifiable holes, but I am certain all five are in there. There was clean paper behind all my targets and I was unable to find any other holes.
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Old February 29, 2020, 02:43 PM   #67
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Yes, 20 MOA base and 100 yard zero. With this ammunition I have 41.75 MOA of Up adjustment. It would be really nice if I can find a 30 or 35 MOA base for this rifle. A 35 MOA base should give me around 57 MOA of up adjustment. And hopefully leave
That's about 24 MOA "used" by the 100 yd zero by your scope--which matches what my loopy uses on a 20 MOA mount.
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Old February 29, 2020, 02:47 PM   #68
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That 140 eldm load measured .473 outside to outside. So .209" center to center. Might be a fluke, but definitely worth looking into I think.
Go buy a lottery ticket.
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Old February 29, 2020, 03:25 PM   #69
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Yeah I know right? Like I said could be a fluke, but I will definitely be looking into it. I did not have my chronograph with me, but if I had to guess I would say velocity should be 2750-2800 with that load.
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