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PostPosted: Thu Aug 21, 2014 11:46 am 
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Joined: Sat Jun 28, 2014 8:14 pm
Posts: 97
rsterne wrote:
Quote:
I'm using a 50 watt halogen hung 4' over the chrony

A single light source can give errors and varying velocity readings, depending on how far above the sensors you shoot.... The higher you shoot, the faster the velocity will be, and the closer to the sensors the lower.... That could easily be your wide ES.... You need two lights, one above each sensor, if you aren't shooting outside....

Bob


Thanks Bob. Im gonna pick up 2 led pucks to mount above the sensors.

Lots more fooling around today. I think I have at about the best I can do.

here is the string with crossman premier hp's on a 2900 psi fill.

1. 892.3
2. 898
3. 899.3
4. 890.4
5. 891.1
6. 890.7
7. 897.1
8. 892.1
9. 895.7
10. 897.2
11. 889.2
12. 892.3
13. 893.0
14. 893.8
15. 893.1
16. 890.3
17. 891.7
18. 890.5
19. 889.6
20. 892.8
21. 894.6
22. 896.6
23. 893.0
24. 896.3
25. 894.6
26. 888.7
27. 892.7
28. 890.3
29. 887.2
30. 893.0
31. 898.1
32. 893.2
33. 892.2
34. 892.3
35. 892.1
36. 890.2
37. 883.3
38. 891.1
39. 885.3
40. 890.3
41. 886.1
42. 887.7
43. 891.5
44. 893.7
45. 890.5
46. 887.5
47. 886.4
48. 885.9
49. 888.3
50. 884.1

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AA 510 xtra .22


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PostPosted: Thu Aug 21, 2014 12:09 pm 
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Joined: Sat Jun 28, 2014 8:14 pm
Posts: 97
I want to thank everyone for their help and apologize to Walter for getting bent out of shape in the start of this thread.

I will point out the gun is not nearly as loud as it was before hammer spring adjustment. I guess that's because I'm not wasting so much air now. I also put 3 washers as shims in the stub of the brass pot to increase valve spring tension. They are 4mm x 8mm x 1mm washers. I tested up to 10 washers stacked in there.
Also, I learned a couple things to get better results on the chrony.
The gun needs to cool down after filling. You also need a steady rest of sort for the rifle and you need to shoot at the same angle every time.

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AA 510 xtra .22


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PostPosted: Thu Aug 21, 2014 12:17 pm 
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Joined: Tue Jan 29, 2013 6:54 pm
Posts: 2411
Location: Northeastern Ontario
Well done, Pumpkinguy. Your string looks very consistent and will likely be even more so with other pellets. I admire your determination in seeing this through to a successful end. You must know your gun inside and out by now.


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PostPosted: Thu Aug 21, 2014 12:43 pm 
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Joined: Sat Jun 28, 2014 8:14 pm
Posts: 97
Penage Guy wrote:
Well done, Pumpkinguy. Your string looks very consistent and will likely be even more so with other pellets. I admire your determination in seeing this through to a successful end. You must know your gun inside and out by now.


Buddy, I have disassembled and emptied the air more times than I care to remember. I know it like the back of my hand.

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PostPosted: Thu Aug 21, 2014 1:08 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8977
Location: Coalmont BC
Well done, you are correct that quiet = efficient.... All 50 shots are perfectly usable, and you can just see the velocity starting to drop for the last 5 shots.... If we figure 45 shots at 32 FPE that is 1440 FPE.... You used 80 bar x 14 CI = 1120 CI of air, which works out to 1440 / 1120 = 1.29 FPE/CI.... With that low an ES and that many shots, your job is done.... Congrats !!!

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Thu Aug 21, 2014 1:22 pm 
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Joined: Sat Feb 28, 2009 12:28 pm
Posts: 662
Pumpkinguy wrote:
rsterne wrote:
Quote:
I'm using a 50 watt halogen hung 4' over the chrony

A single light source can give errors and varying velocity readings, depending on how far above the sensors you shoot.... The higher you shoot, the faster the velocity will be, and the closer to the sensors the lower.... That could easily be your wide ES.... You need two lights, one above each sensor, if you aren't shooting outside....

Bob


Thanks Bob. Im gonna pick up 2 led pucks to mount above the sensors.

Lots more fooling around today. I think I hathe best I

can do.
I think that is more efficient than mine.
Later on if you're into the hammer area remove oil form hammer bushes and the hammer rail ,then polish the rail with toothpaste or jewellers rouge and run dry..kelly

1. 892.3
2. 898
3. 899.3
4. 890.4
5. 891.1
6. 890.7
7. 897.1
8. 892.1
9. 895.7
10. 897.2
11. 889.2
12. 892.3
13. 893.0
14. 893.8
15. 893.1
16. 890.3
17. 891.7
18. 890.5
19. 889.6
20. 892.8
21. 894.6
22. 896.6
23. 893.0
24. 896.3
25. 894.6
26. 888.7
27. 892.7
28. 890.3
29. 887.2
30. 893.0
31. 898.1
32. 893.2
33. 892.2
34. 892.3
35. 892.1
36. 890.2
37. 883.3
38. 891.1
39. 885.3
40. 890.3
41. 886.1
42. 887.7
43. 891.5
44. 893.7
45. 890.5
46. 887.5
47. 886.4
48. 885.9
49. 888.3
50. 884.1


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PostPosted: Thu Aug 21, 2014 6:15 pm 
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Joined: Mon Feb 11, 2013 12:46 am
Posts: 4121
that's a great shot string 8)
Bob's the man :wink:

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PostPosted: Thu Aug 21, 2014 9:46 pm 
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Joined: Wed Dec 02, 2009 4:04 pm
Posts: 1078
http://precisionrifleblog.com/2012/07/2 ... liability/

Thought the chrony advice was helpful, and then found this.


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