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Rifle Scopes Bushnell XRS 4.5-30x50mm - Optimal Scope Base/Ring Cant and 0.34" Click Value at 100 yds?

Ming_the_Merciless

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Minuteman
Jan 27, 2014
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I'm considering which rings to put on a potential scope and I'm looking for a second opinion. The rifle has a 20 MOA base built in, and the scope rings come with either 0 or 20 MOA cant which would gives a total of 40 MOA. Would 40 MOA be too much cant to establish a zero at 100 yards?

Here's a what I've gathered thus far, any input would be greatly appreciated.

Bushnell_XRS_45_30_50_Adjustment_Range_zps9790d518.png

According to Bushnell's website the adjustment range for the scope is 50" at 100 yards, which equates to 13.89 mils or 47.7 MOA. I assume this is half of total value, as other users have reported any where between 27 to 30 or so mils worth of total adjustment. So I quickly charted what a 0 MOA, 20 MOA, and 40 MOA would give of vertical adjustment assuming the rifle zeros at 0 MOA, which I realize it doesn't, but gives me a rough estimate of the range I'll have available.

0_20_40_MOA_Base_Compare_1_zps01f5e8b4.png

So it seems to me, with a 34mm tube diameter the scope is very capable, even without cant, of reaching out to 1,000 yards with .308, but the rifle does have an inherent 20 MOA base built in, which gives an additional 5.82 mils on top of the 13.89 mils for 19.7 mils of adjustment which corresponds to roughly 1,200 yards for .308, while 40 MOA (11.64 mils) yields an adjustment of 25.5 mils which is ~1,400 yards. However, with 40 MOA, this only gives me 2.3 mils worth on the opposite direction, assuming the rifle is zero at 0 MOA, or equal to 8.28" worth of adjustment at 100 yards above the horizon. Will this be sufficient to zero say 175 SMK out at 100 yards?


Not related to my question about scope cant, but I believe I've spotted an inconsistency on the product information page. What appears to be a typo on the product website, as it lists an adjustment of 0.34" per click at 100 yards oppose to 0.36" which corresponds to 0.1 mil adjustment at 100 yards, since it's a MRAD scope. I'm I missing something here, if so, why is there a discrepancy?
 
I just finished a 6.5x55 build and have the Bushnell XRS mounted on a 20 Moa base. It's sitting in Vortex Prevision matched rings with no cant. I just finished sighting it in last weekend and at 100 yards I could not dial down enough to get a perfect zero. Instead I am about 1.5 inches high. I'm satisfied with that so I'm not touching it. But I'm only at 20 Moa can't and it's bottomed out. Just FYI.
 
I'm considering which rings to put on a potential scope and I'm looking for a second opinion. The rifle has a 20 MOA base built in, and the scope rings come with either 0 or 20 MOA cant which would gives a total of 40 MOA. Would 40 MOA be too much cant to establish a zero at 100 yards?

Here's a what I've gathered thus far, any input would be greatly appreciated.

Bushnell_XRS_45_30_50_Adjustment_Range_zps9790d518.png

According to Bushnell's website the adjustment range for the scope is 50" at 100 yards, which equates to 13.89 mils or 47.7 MOA. I assume this is half of total value, as other users have reported any where between 27 to 30 or so mils worth of total adjustment. So I quickly charted what a 0 MOA, 20 MOA, and 40 MOA would give of vertical adjustment assuming the rifle zeros at 0 MOA, which I realize it doesn't, but gives me a rough estimate of the range I'll have available.

0_20_40_MOA_Base_Compare_1_zps01f5e8b4.png

So it seems to me, with a 34mm tube diameter the scope is very capable, even without cant, of reaching out to 1,000 yards with .308, but the rifle does have an inherent 20 MOA base built in, which gives an additional 5.82 mils on top of the 13.89 mils for 19.7 mils of adjustment which corresponds to roughly 1,200 yards for .308, while 40 MOA (11.64 mils) yields an adjustment of 25.5 mils which is ~1,400 yards. However, with 40 MOA, this only gives me 2.3 mils worth on the opposite direction, assuming the rifle is zero at 0 MOA, or equal to 8.28" worth of adjustment at 100 yards above the horizon. Will this be sufficient to zero say 175 SMK out at 100 yards?


Not related to my question about scope cant, but I believe I've spotted an inconsistency on the product information page. What appears to be a typo on the product website, as it lists an adjustment of 0.34" per click at 100 yards oppose to 0.36" which corresponds to 0.1 mil adjustment at 100 yards, since it's a MRAD scope. I'm I missing something here, if so, why is there a discrepancy?

It's 100% .36". That or I've gotten lucky a bunch of times. :)
 
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According to the product page at Euro Optic, it had 26 mils of total elevation travel so you should be fine with 40 MOA of cant

Thanks for sharing the info. Lovely, even the product information from the manufacturer is inconsistent. Bushnell list 50" worth of adjustment at 100 yards, which corresponds to the original estimate of 27.77 mils or 95.5 MOA total adjustment. Whereas Eurooptic lists 26 mils. Yes, I realize I'm splitting hairs at 1.8 mils, or .9 mils from either top or bottom, but consistency is everything - especially for long range precision shooting. So, I've revised the charts to reflect the more conservative value of 26 mils to helps others that may also be looking for an optimal cant on the Bushnell XRS or other scope that has a comparable adjustment range.

0_20_40_MOA_Base_Compare_2_zpsf70038a8.png

So with a 40 MOA cant instead of earlier estimated 2.3 mils worth of adjustment above horizon, it now is 1.36 mils which equates to 4.896" worth of adjustment at 100 yards above horizon.While a 20 MOA will yield 7.18 mils or 25.848" at 100 yards, and no cant would see the full 13 mils of adjustment for 46.803" at 100 yards. Keep in mind these values are only estimates, ideal condition - assuming the rifle is zeroed at 0 MOA, parallel to horizon which it isn't.

I just finished a 6.5x55 build and have the Bushnell XRS mounted on a 20 Moa base. It's sitting in Vortex Prevision matched rings with no cant. I just finished sighting it in last weekend and at 100 yards I could not dial down enough to get a perfect zero. Instead I am about 1.5 inches high. I'm satisfied with that so I'm not touching it. But I'm only at 20 Moa can't and it's bottomed out. Just FYI.
Muddawg, the zero stop is likely engaged, you shouldn't have any trouble getting a 100 yard zero with a 20 moa base.

This might help, another member here, Sonic Saami, posted some instructions on how to position the zero stop as the OEM instructions were confusing.

http://www.snipershide.com/shooting/snipers-hide-rifle-scopes/203063-disappointing-bushnell-xrs-experience-what-would-you-do.html

It's 100% .36". That or I've gotten lucky a bunch of times. :)

Thanks for the confirmation. I don't know why it didn't dawn on me earlier, but it's a common mistake to think that 1 mil equals 3.4" at hundred, oppose to 3.6", because 1 mil equals 3.4 MOA, and was probably why Bushnell mistakenly listed 0.34" for .1 mil adjustment than 0.36".

1_mil_to_inches_zps75c868de.png


So thanks for feedback guys. I'll go ahead and order the 20 MOA rings for a total 40 MOA cant, if it so happens I can't zero at 100 yards, which I don't foresee being a problem, I'll just flip the rings backward for zero MOA, or run with whatever hold over it corresponds to.