A couple months ago I ordered in a set of Ivey adjustable scope rings to evaluate for a future project a couple of my customers, you know then as Lerch and BJ, want me to build for them. Seems they want to go after the world record varmint kill which I believe is 3144 yards.
Well, the obvious problem is getting enough vertical adjustment to get the crosshair to catch up with the bullet drop at nearly 2 miles which is where the boys will be trying to make a kill at, hey, if your gonna break a record, why not REALLY break the record [img]/ubbthreads/images/graemlins/grin.gif[/img]!!
Anyway, being in the 50 BMG crowd, I had seen several advertisments for an adjustable scope mounting system that offered up to 150 moa of vertical adjustment in the base and rings alone.
There are two designs from this company called Ivey. One is a once piece rail type which piggy-backs onto another 1913 type rail. There is a micrometer adjustment at the rear of the rail which controls the vertical adjustment. There are also lock rings to fix or release the front and rear pivot for adjustment.
The only problem I say with this system was the extreme height needed for it. You would have to add a set of tactical style rings on top of this rail base which would be on top of another rail base........
Well, I noticed they had come out with another design which was simply a set of rings that would mount directly onto a rail type base. They are still high but half what the other system would be.
I decided to order in a set and when I called to order them I told them what we were doing. They said they would do their best to make the system as tight as possible for the best repeatability possible. They say that 1 moa repeatability is there guideline but if they really made the adjustments tight this would be reduced but at an expense of being able to turn the micrometer adjustment easily because of the tight fit.
Well, they came in a couple weeks ago and my first impression was very good. They were very solidly built and eveything was a very quality fit. Very impressive machining in the set of rings I got in.
This pic shows the system mounted on my 338 Kahn and in the 0 moa setting. To mount the front and rear rings much be set up at a certain distance apart with matches a 1913 rail mount perfectly so this is really easy to do.
Then to make an adjustment you unlock the lock adjustment on each ring, dial in your wanted moa increase with the micrometer adjustment on the rear ring, lock down the ring locks again and go to it.
The micrometer adjustment is clearly marked in moas very similiar to a Redding Comp reloading die.
This pic shows the Iveys in full 150 MOA adjustment. You can see that with any sun shade on at all you need the height that the rings provide to clear the barrel.
This is a little closer view of the micrometer adjustment on the rear ring.
I have not had a chance to get out and rang test these rings yet. Will be doing so soon but I suspect for what we are going to be using them for they will work fine. Basically to allow us to get out to very extreme range with the course adjustment and then fine tune things with the scopes own adjustments.
We will see. They are not cheap, I believe they were a bit over $350 but I would have to check the invoice on that. All in all, first impression is very good and they seem to be a very quality product. We will see if that opinion holds up while range testing!!
One thing I would like to change and probably will would be to replace the three spur lock levers with either a longer one arm lever or a hex head lock nut so that a torque wrench could be used to tighten after adjustment.
The single lever like those found on most QD ring systems would also allow more leverage to lock the rings down. This may not be needed, we will see when testing.
Just wanted to post some pics of the rings.