Scope issue on my Thomas FT rifle. I have my Sightron 10-50X60

Scope issue on my Thomas FT rifle. I have my Sightron 10-50X60

Joined: June 10th, 2014, 6:26 pm

June 29th, 2017, 8:47 pm #1

scope setup for clicking. At 10 yards, I'm hitting dead on. At 55 yards, I have to hold to the left or click 4 clicks to the right. Which way do I need to rotate my scope, when looking thru it, to line up my horizontal. Thanks, Don
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Joined: January 1st, 2012, 11:50 pm

June 29th, 2017, 10:15 pm #2

Not enough info to diagnose the problem. Set your zero to your apex distance, and then shoot at 10 yards and 55 yards. Does the 10 yard hit right or left? Does the 55 yard hit right or left? The following diagram might be useful:

Last edited by Scotchmo1957 on June 29th, 2017, 10:16 pm, edited 1 time in total.
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Joined: March 29th, 2010, 6:51 am

June 29th, 2017, 10:44 pm #3

scope setup for clicking. At 10 yards, I'm hitting dead on. At 55 yards, I have to hold to the left or click 4 clicks to the right. Which way do I need to rotate my scope, when looking thru it, to line up my horizontal. Thanks, Don
a pellet movement of .05 inches, barely perceptible. Your scope has 1/8 MOA per click adjustment or 8 clicks = 1 inch at 100 yds or .10 inches at 10 yds. I would set it to be dead on the 55 yd target and forget everything else.

Scott's point about cant is also very applicable. Also have you trued your scope rings?

https://www.midwayusa.com/product/21301 ... apping-kit

Jim in Sacramento
Last edited by 22Jim on June 29th, 2017, 10:45 pm, edited 1 time in total.
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Joined: January 1st, 2012, 11:50 pm

June 29th, 2017, 10:59 pm #4

for a 3/8" target at 10 yards. If you can hold/shoot 1moa every time, you'll still make those shots. If your spread is 2moa, you can't spare those clicks.
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Joined: March 29th, 2010, 6:51 am

June 29th, 2017, 11:20 pm #5


but I think .05in is 1/4 of he wiggle room. 0.375 - 0.177 = .0198 / .05 is approx = 4 or 25%.

0.198 = 2 MOA at 10 yds, .05 = 1/2 MOA.

Jim in Sacramento
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Joined: June 10th, 2014, 6:26 pm

June 30th, 2017, 12:07 am #6

scope setup for clicking. At 10 yards, I'm hitting dead on. At 55 yards, I have to hold to the left or click 4 clicks to the right. Which way do I need to rotate my scope, when looking thru it, to line up my horizontal. Thanks, Don
scope. It was off a little. I just shot 30 targets on my FT range and it seems to be better. Originally I was hitting the 10 yard shots but hitting right at 55 yards if holding center. If I clicked right 4 clicks, I was hitting at 55 but splitting my 10 yard 3/8" target.
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Joined: June 10th, 2014, 6:26 pm

June 30th, 2017, 12:26 am #7

a pellet movement of .05 inches, barely perceptible. Your scope has 1/8 MOA per click adjustment or 8 clicks = 1 inch at 100 yds or .10 inches at 10 yds. I would set it to be dead on the 55 yd target and forget everything else.

Scott's point about cant is also very applicable. Also have you trued your scope rings?

https://www.midwayusa.com/product/21301 ... apping-kit

Jim in Sacramento
Thomas will be within a inch at 30 yards with your scope at optical center. Have tried a Sightron, Leupold comp. and a Nikko MK11 10-50X60. Didn't believe it till I tried it. Don
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Joined: January 1st, 2012, 11:50 pm

June 30th, 2017, 12:54 am #8

but I think .05in is 1/4 of he wiggle room. 0.375 - 0.177 = .0198 / .05 is approx = 4 or 25%.

0.198 = 2 MOA at 10 yds, .05 = 1/2 MOA.

Jim in Sacramento
But it is not a random error.

The error is 4 clicks to one side only. The unidirectional wiggle room is 0.099".

0.099 / .05 is approx = 2 or 50%

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Joined: January 1st, 2012, 11:50 pm

June 30th, 2017, 1:37 am #9

scope. It was off a little. I just shot 30 targets on my FT range and it seems to be better. Originally I was hitting the 10 yard shots but hitting right at 55 yards if holding center. If I clicked right 4 clicks, I was hitting at 55 but splitting my 10 yard 3/8" target.
Checking just the 10yd and 55yd poi is insufficient to diagnose a cant problem. Zero at the apex and then check your 10 yard and 55 yard windage.

If the three points (10yd, apex, 55yd) are in a perfect line, you have only a scope cant problem. You will need to rotate the scope in the mounts. If the three points are not in a line, you definitely have a gun cant problem (and you might still have a scope cant problem). First order of business when shooting multiple distances with significant rise and drop, is fix any scope cant problem. Scope cant cannot be fixed with a bubble level. Once you fix the scope cant, you can use a bubble level while shooting in the field to correct for any gun cant.

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Joined: June 8th, 2014, 9:45 pm

June 30th, 2017, 2:03 am #10

scope. It was off a little. I just shot 30 targets on my FT range and it seems to be better. Originally I was hitting the 10 yard shots but hitting right at 55 yards if holding center. If I clicked right 4 clicks, I was hitting at 55 but splitting my 10 yard 3/8" target.
A very unnoticeable wind drift won't make any difference at 10 yards but at 55 yards 1" to 1 1/2" is possible from my experience. Glad to hear you have the problem under control.
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