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Needs help with box test

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2009 at 23:17
stickbow46 View Drop Down
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I'm new to using scopes[old school iron sights man] can I please get some help on the correct way to do a box test to check my turrets...Thanks
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2009 at 23:37
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What you are doing is using the adjustments to shoot  four or more shots in a square.  This can be done at any distance and the box can be any size you like. The point is seeing that the adjustments of the scope are consistent.  Lets say for example  you have a rifle that consistently shoots a half inch group at 100 yds (obviously not all of them do) from your zero at 100 shoot three shots then go up 4moa shoot three shots the go right 4moa shoot three shots then go down 4moa shoot three shots then adjust back left 4moa and shoot to see that it brought you back to Zero.  You can alter the range and size of the box to check it at distance also but beware of wind pushing your bullet and learn to correct for wind and trajectory. http://www.eskimo.com/~jbm/cgi-bin/jbmtraj_simp-5.0.cgi
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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2009 at 07:31
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And if you REALLY wanna test it, shoot the groups one round at a time, moving 4 MOA after each shot. One shot to upper left, move, one shot to upper right, move, one shot to lower right, move, one shot to lower left, move back to upper left and repeat x 4 - then back to center and check the zero.

If you scope is dead-nutz and you do your part, you should have a square with 4 nice, tight groups at each corner and in the bullseye.


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2009 at 08:51
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The other way to do it, and saving a few bullets:
 Use a grid target or a paper with 1 inch squares on them at 100 yds.
Fit the rifle into an immovable position. This is the tricky part. A good rifle rest and small sandbags helps.
Aim at the target, mark the aimpoint. This can be done by having the same grid paper next to you on the bench and marking it.
Then whilst keeping the rifle still, dial 20 clicks left, up down and back to zero etc as per above, each time marking the movement on the target for later examination and analysis. If the scope performs correctly it should track in a square, triangle or whatever shape you choose but it must go back to zero.
The downside off course is that this method does not test the scopes ability to withstand recoil. But that can be tested using lesser bullets once you are happy the scope tracks well mechanically.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2009 at 08:56
Rancid Coolaid View Drop Down
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It makes a few assumptions.

If you really care about repeatability, there is no better way, in my opinion, than a good box test - with a move after each shot.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2009 at 09:09
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Originally posted by Rancid Coolaid Rancid Coolaid wrote:

It makes a few assumptions.

If you really care about repeatability, there is no better way, in my opinion, than a good box test - with a move after each shot.
 
+1 Agree with you 100%. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2009 at 18:43
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Originally posted by Rancid Coolaid Rancid Coolaid wrote:

And if you REALLY wanna test it, shoot the groups one round at a time, moving 4 MOA after each shot. One shot to upper left, move, one shot to upper right, move, one shot to lower right, move, one shot to lower left, move back to upper left and repeat x 4 - then back to center and check the zero.

If you scope is dead-nutz and you do your part, you should have a square with 4 nice, tight groups at each corner and in the bullseye.


This is the method I use most of the time...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/25/2009 at 06:56
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Thank you very much for all the responce,you have all been very helpful in answering my question.I will go out today & give the test a go.This isuch a great sight...Thanks
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/28/2009 at 19:08
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don't mean to hijack the post, but i have noticed alot of my scope don't do so well in this area; i have also noticed that sometimes 6 clicks up makes a 1.5 " difference but sometimes 6 clicks will only be 1" difference on the same scope. i have narrowed this down to the scope(s) not tracking correctly. should i be looking into scopes with an etched reticle or just a better scope period. said scopes are a monarch, 4200 tactical, and vx3, thanks in advance.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/28/2009 at 19:52
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Originally posted by beergoggles beergoggles wrote:

don't mean to hijack the post, but i have noticed alot of my scope don't do so well in this area; i have also noticed that sometimes 6 clicks up makes a 1.5 " difference but sometimes 6 clicks will only be 1" difference on the same scope. i have narrowed this down to the scope(s) not tracking correctly. should i be looking into scopes with an etched reticle or just a better scope period. said scopes are a monarch, 4200 tactical, and vx3, thanks in advance.
 
This is fairly common among  hunting scopes, especially ones using a friction turret instead af a click turret. It sometimes takes a few shots for recoil to settle them in. Obviously this is not acceptable in a serious target or tactical scope, but it really isn't the worst thing in the world either, as long as it adjusts within a minute of angle or so (preferably less!) and settles in reliably with a couple shots.
 Etched reticles have nothing to do with this phenomenon, in and of themselves. Separate issue.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/29/2009 at 06:19
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thanks ronk, i do a bit of long range varmint hunting and like to use my "clicks" as opposed to bdc compensators and various other reticles; what brands of scopes would track more reliably?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/29/2009 at 09:19
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as said box test tells you how a scope is tracking, but what is that?  a lot of scopes to give a full value movement with the click they represent, also some scopes will be stated in moa when they are inches per hundred yards. sometimes something like 4 moa movement on the deal will actually only be 3.85 moa. I like to test using a 9 target grid with 3 shots per group but as rifledude suggest a change with each shoot. grid dots are numbered then a random number generator gives the dot to be shot each time. this way shift patterns are easily recognized. also changes at the extremes of the dials can be detected. bdc reticles do away with this problem somewhat, and sometimes even the high dollar scopes don't track correctly. (should be sent in for adjustment of course)

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/29/2009 at 14:22
beergoggles View Drop Down
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thanks ronk and dale, i will try to figure out more consistently where it is tracking, so far most of them just seem to do their own thing.
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