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  #11  
Old 1st February 2017, 06:45 PM
DeanB DeanB is offline
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Quote:
Originally Posted by rich View Post
You can do a test for reg creep. Set up a paper target at 50 yards and aiming at the centre, fire ten shots at precisely one minute intervals.

Then repeat with an identical target at the same distance but this time ten shots at 30 second intervals.

Finally a third target and this time ten shots at fifteen second intervals.

Then bring the targets in, and mark a line through the horizontal centre of each group. If the lines are all at the same height in relation to your aim point, the reg probably isn't creeping. If the sixty second line is lower down than the thirty second line and that is lower than the fifteen second line, it's odds on it's creeping.
Apologies for interrupting. But why not do this over the chrono rather than assess pellet drop?
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  #12  
Old 1st February 2017, 06:53 PM
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Timing the shots like Rich says will give you more information about what is going on, if the reg is creeping a short delay might produce high shots and a long delay low shots, the severity of the leak will determine how long a short and long delay would need to be to demonstrate this. But you got to start somewhere and some timed shooting is where to start!
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  #13  
Old 1st February 2017, 06:54 PM
DeanB DeanB is offline
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I meant carry out Rich's schedule but shoot through a chrono rather than at targets.
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  #14  
Old 1st February 2017, 06:57 PM
palmanda palmanda is offline
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Quote:
Originally Posted by DeanB View Post
Apologies for interrupting. But why not do this over the chrono rather than assess pellet drop?
Don't apologise I. After all the advice I can get

Quote:
Originally Posted by Tench View Post
Timing the shots like Rich says will give you more information about what is going on, if the reg is creeping a short delay might produce high shots and a long delay low shots, the severity of the leak will determine how long a short and long delay would need to be to demonstrate this. But you got to start somewhere and some timed shooting is where to start!
I think I'll try and do both, timed shots over the crono as well. That should give some useful information I can collate together
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  #15  
Old 1st February 2017, 06:58 PM
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Quote:
Originally Posted by DeanB View Post
I meant carry out Rich's schedule but shoot through a chrono rather than at targets.
Timing shots over a chrono would be my choice too as it takes the errors that could arise from shooting at distance out of the equation, but on the other hand you cant beat real world testing!
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  #16  
Old 1st February 2017, 07:04 PM
palmanda palmanda is offline
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Timing shots over a chrono would be my choice too as it takes the errors that could arise from shooting at distance out of the equation, but on the other hand you cant beat real world testing!
And believe me I have a LOT of errors shooting in the real world
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Old 2nd February 2017, 11:15 AM
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simmmo simmmo is offline
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Group shooting indoors last night multiple five shot groups on paper at 35yds side by side, missed at least two targets Sunday high where they shouldn't have hit, with new mfc that has greatly reduced flip. All groups were identical with four pellets in a nice small hole and one three pellets high or just less than half a mildot high on the reticle gun is almost dead to shoot and I am prone so imperceptible movement on crosshairs. The consistency of the group size and shape to my mind makes me think there is some cycle going on as the apparent flyers aren't printing random but almost identical location in each group. So I chrono the gun get a 4fps spread over 30 shots out of the tin. Shoot 15 shots on paper through the chrono now set at 35yds and watch the group making note of the shots that go high. Get no information downrange as SV says 4 which I think is ok and the fps spread was all similar. So I clean the barrel, no change. Then I take the mfc off and replace with old end cap, no change. Then I take the hammer out make sure it is clean etc, no change. I then shoot it off reg groups immediately come back to the expected small single hole until they as expected start to print a little lower. So I strip the reg clean it inside and put it back together. Gun is now shooting perfect. So just cleaning the reg appears to have solved the problem that wasn't highlighted to me by doing a chrono string both at the muzzle and downrange. I admit I have no clue as to why cleaning the reg solved the problem of the gun shooting the way it was as the consistency over the chrono was very good before cleaning and had me convinced it wasn't the reg until, I shot it off reg and the groups immediately came back. I can only think the dirty reg caused some harmonic issue within the gun that was causing the high shots. Obviously that is merely a theory/guess.

Good luck with your testing, got to love airguns.

Andy.
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  #18  
Old 2nd February 2017, 11:30 AM
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Seen something similar, we've seen chronos read the same amount, but a POI change down range and a notable change in the tone of the muzzle report.

Got a theory on it, but need to do some more testing. If it holds fruit then it will unlock a lot of doors as to the oddities of airgun behaviour.
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  #19  
Old 2nd February 2017, 11:44 AM
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There did seem to be a change in tone on these shots a bit of a flatter blat but gun isn't overly loud as a lot back vents into the shroud but mfc sends some air back towards me now.

Andy
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  #20  
Old 2nd February 2017, 11:53 AM
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Part of the benefit of shooting a paper or card target is that you can use the result as evidence if you need to convince the supplier or manufacturer of the problem.

It's more difficult to achieve that with a chrono string; you may be able to print out a succession of results, but the other variables come in now, is the chrono consistent etc, and attitudes like what the heck does it matter if the MV has dropped a bit. Believe me I've been down this road more than once with my own rifles and those belonging to club members. Being able to put on the table a set of target cards with demonstrable variations in POI height is a powerful argument.

OK, there's not much point in trying to collect this proof if you are shooting outdoors in a force 6 like today.
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