Using Burris Pos-Align inserts

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slammer1

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I'm looking for some advice from people who have used the Burris pos-align system. The Burris Signature high rings are mounted on my Rossi Wizard single shot (high rings are necessary for clearance between my Rossi's hammer and the scope eyepiece).

I began by centering my scope reticles in their middle range, then I made sure the rifle was sitting level (I measured level from the weaver base). I slid the rings onto the weaver base, put the scope into the Burris rings using the 0 inserts and made sure the crosshairs were perfectly level before tightening everything down (nice rings!)

I visited the range and at 25 yards (using lead sled to minimize shooter error) sent 3 rounds downrange. The bullets impacted 12" directly above where the scope was aiming. That's quite a difference for 25 yards!

So, now I gather its time for some inserts to move the scope in line with the bore. I picked up a set of +/- 20 inserts ($13 for 2 pieces of plastic: can you say profit?!!. I will put these on the front ring.

Will the +/-20 inserts get me close- or will it be necessary to do inserts on the back ring as well? (I'd like to use the inserts as much as possible before adjusting the reticles)

Thanks for your advice on this one.
slammer1
 
The rings are 10cm (100mm) apart (measured from mid point of ring to mid point of ring). 53 mm from middle of scope tube to center of bore. Bullets impact 305 mm higher than point of aim.
 
For each ring that you put the 0.020" inserts in (assuming you put them in totally vertically), your POI will change 4.6" at 25 yards. If you put a set in the front and rear rings, you'll be able to bring your POI down by about 9".
 
When using Pos-Aligns at both ends, remember to set them "+" at one and and "-" at the other or they will cancel each other out.
 
Thank-you for the calculations. Okay I'm going to sneak away to the range tomorrow morn. I'll try out the 1 set of +/-20's (can't get to the city for awhile) and likely will need to make a 2nd trip for the 2nd set.
slammer1
 
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