DISCLAIMER: This is a description of MY OWN SCOPE. You have all rights to do your own stupid mistakes.
Couple month ago I started looking for another scope for my Remington 700P in 308. There was great review article on Sniper Central website: http://www.snipercentral.com/menace45.htm.
For everything good what you want to know refer to their article. For everything else just keep reading…
There are two approaches of trying new scope. Get one used, what is cheaper, and blame previous owner that he screwed it up, or buy new one and blame yourself for buying it. I went with option #2. I ordered brand new IR in metric (milliradian) adjustments. I spent my time in military and for me it’s easy to calculate bullet drop adjustments when click value is equal 1cm at 100 m. After only 6 weeks it was in my post box. Box with scope was marked SIR451856 B-MP. Serial number is 0004(!). Checking manufacturer website didn’t clear what B-MP stands for. First surprise was that it had ¼ MOA turrets instead of metric. I can live with that. Second surprise was that ML-20 reticle became ML-16(?) with introduction of IR option. I can live with that too.
Finally it was mounted on Remington 700 Police, glass bedded, trigger adjusted to 2 pounds, Badger bolt handle extension, 20MOA rail, 30mm steel scope rings. And yes, I did use Locktite. And I do reload.
I live in Calgary and shoot at Mountain Marksman club range. 300m still under construction, so I was limited to 200m. To zero it was easy. First shot at target and then you just bring your reticle from point of aim to point of impact. Took couple more rounds for final adjustments. Next went Chrony to measure speed. Then all results went into ballistic software. I have 2 ballistic calculators in laptop and one in Pocket PC. All three ballistic calculators agreed on MOA adjustments with precision of +/- 0.1 MOA. Usually that is good enough to get home, print range/drop card and tape it to your rifle.
WRONG! Not with Falcon! Keep reading…
I still had few rounds left, dialed 200m adjustment according to ballistic calculator. All shots went higher. That didn’t ring my bell…
Then back to 100m I decided to try how repetitive scope is. Dialed 20MOA up and shot at target. I used 80x60 cm paper aiming at bottom mark. I guess bullet-ferry visited us and bullet disappeared without leaving dollar under cheek rest. No bullet mark on 80 cm line? At this distance it was suppose to be approximately 21 inch high. That didn’t ring my bell also... Dialed 20MOA down, impact point went back to zero.
Third surprise came when I decided to let barrel to cool off and put target turrets to zero marks for elevation and windage. After removing turrets screws I tried to pull them off. Good luck! I’m not a small guy but no way was I able to remove them easy. I huffed and puffed and finally they went off. Look ma no tools!
Surprise number four. You think it’s still zeroed at 100m? Right?
WRONG! Not with Falcon! Keep reading…
Without installing them back fired three more rounds. Zero? What zero? Four inches lower and seven inches to the right!!!!! By pulling with hand???? At 100m???
Re-zero again. Carefully put turrets back. Twice before it went to zero again.
Biggest surprise came when I was shooting at 375 meters at tree stamp. 15 rounds went 2 feet above point of aim. Prone with bipod. Nice crispy day, no wind, I was able to see bullet turbulence through scope. Pockets content is laser range finder (distance), anemometer (wind speed and temperature), GPS (elevation) and pocket PC for ballistics calculator. Next came ballistic chart pulled from rifle flying towards same tree stamp. This time it hit lower. Much lower… Low BC I guess. Didn’t have Allen wrench to try scope hit that stamp.
First thought was that I got scope in metric with ¼ MOA turrets. I took my chemistry class long time ago so I should be able to calculate tangent of square triangle. In metric world ¼ MOA at 100m is 7.25mm or 0.725 cm. Difference between metric adjustments (1cm per click) value and MOA only 0.275 cm per click. Value of difference for one click at that distance is 3.75 times 0.275 is 1.03 cm. I need 6.75 MOA adjustment for bullet drop @375m. This equals to 27 clicks (remember I have ¼ MOA turrets). Total difference at this distance is 27.84 cm. Where is the other 32 cm comes from???
Brings another question - Exactly how many foot-####-pounds-liters per square millimeter of one inch linear revolution click value this English-Chinese hybrid has?
I guess I can go back to gun range to find real click value and recalibrate adjustments accordingly.
I was looking for used scope first and I’m still getting replies from forum members. One was going to sell his scope because “shift conflicts with the range”
Looks like I’m not the only one having problem with scope.
Anyone to share his experience?
Thanks!
Sergey
Couple month ago I started looking for another scope for my Remington 700P in 308. There was great review article on Sniper Central website: http://www.snipercentral.com/menace45.htm.
For everything good what you want to know refer to their article. For everything else just keep reading…
There are two approaches of trying new scope. Get one used, what is cheaper, and blame previous owner that he screwed it up, or buy new one and blame yourself for buying it. I went with option #2. I ordered brand new IR in metric (milliradian) adjustments. I spent my time in military and for me it’s easy to calculate bullet drop adjustments when click value is equal 1cm at 100 m. After only 6 weeks it was in my post box. Box with scope was marked SIR451856 B-MP. Serial number is 0004(!). Checking manufacturer website didn’t clear what B-MP stands for. First surprise was that it had ¼ MOA turrets instead of metric. I can live with that. Second surprise was that ML-20 reticle became ML-16(?) with introduction of IR option. I can live with that too.
Finally it was mounted on Remington 700 Police, glass bedded, trigger adjusted to 2 pounds, Badger bolt handle extension, 20MOA rail, 30mm steel scope rings. And yes, I did use Locktite. And I do reload.
I live in Calgary and shoot at Mountain Marksman club range. 300m still under construction, so I was limited to 200m. To zero it was easy. First shot at target and then you just bring your reticle from point of aim to point of impact. Took couple more rounds for final adjustments. Next went Chrony to measure speed. Then all results went into ballistic software. I have 2 ballistic calculators in laptop and one in Pocket PC. All three ballistic calculators agreed on MOA adjustments with precision of +/- 0.1 MOA. Usually that is good enough to get home, print range/drop card and tape it to your rifle.
WRONG! Not with Falcon! Keep reading…
I still had few rounds left, dialed 200m adjustment according to ballistic calculator. All shots went higher. That didn’t ring my bell…
Then back to 100m I decided to try how repetitive scope is. Dialed 20MOA up and shot at target. I used 80x60 cm paper aiming at bottom mark. I guess bullet-ferry visited us and bullet disappeared without leaving dollar under cheek rest. No bullet mark on 80 cm line? At this distance it was suppose to be approximately 21 inch high. That didn’t ring my bell also... Dialed 20MOA down, impact point went back to zero.
Third surprise came when I decided to let barrel to cool off and put target turrets to zero marks for elevation and windage. After removing turrets screws I tried to pull them off. Good luck! I’m not a small guy but no way was I able to remove them easy. I huffed and puffed and finally they went off. Look ma no tools!
Surprise number four. You think it’s still zeroed at 100m? Right?
WRONG! Not with Falcon! Keep reading…
Without installing them back fired three more rounds. Zero? What zero? Four inches lower and seven inches to the right!!!!! By pulling with hand???? At 100m???
Re-zero again. Carefully put turrets back. Twice before it went to zero again.
Biggest surprise came when I was shooting at 375 meters at tree stamp. 15 rounds went 2 feet above point of aim. Prone with bipod. Nice crispy day, no wind, I was able to see bullet turbulence through scope. Pockets content is laser range finder (distance), anemometer (wind speed and temperature), GPS (elevation) and pocket PC for ballistics calculator. Next came ballistic chart pulled from rifle flying towards same tree stamp. This time it hit lower. Much lower… Low BC I guess. Didn’t have Allen wrench to try scope hit that stamp.
First thought was that I got scope in metric with ¼ MOA turrets. I took my chemistry class long time ago so I should be able to calculate tangent of square triangle. In metric world ¼ MOA at 100m is 7.25mm or 0.725 cm. Difference between metric adjustments (1cm per click) value and MOA only 0.275 cm per click. Value of difference for one click at that distance is 3.75 times 0.275 is 1.03 cm. I need 6.75 MOA adjustment for bullet drop @375m. This equals to 27 clicks (remember I have ¼ MOA turrets). Total difference at this distance is 27.84 cm. Where is the other 32 cm comes from???
Brings another question - Exactly how many foot-####-pounds-liters per square millimeter of one inch linear revolution click value this English-Chinese hybrid has?
I guess I can go back to gun range to find real click value and recalibrate adjustments accordingly.
I was looking for used scope first and I’m still getting replies from forum members. One was going to sell his scope because “shift conflicts with the range”
Looks like I’m not the only one having problem with scope.
Anyone to share his experience?
Thanks!
Sergey