GTA
Target Shooting by Match - Match Results => Target Shooting Discussion General => : Magnum October 05, 2009, 02:59:43 AM
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I am finding that 4 to 6 pumps seems to work best for my accuracy and maybe 6 is optimum although it may only be psychological for me:) I am curious to know if anyone else has got scientific about how many pumps/FPS is optimum for the 1377 ? below is a chrony test I did a few months back. Tony
"This is Quote from a post I did back in august" = Thought this was interesting info for us "1377 people" that don't mind the pumping part:) I fired 5 shots through crony and got the average FPS, using different amount of pumps . note also that the spread was no more than 18 fps max for all strings most were less. 2 pumps=331 fps, 4 pumps=432 fps, 6 pumps=508 fps (best consistent), 8 pumps=558 fps, 10 pumps=585, 12 pumps=609 fps, 14 pumps=637 fps, 16 pumps=654 fps.
The 1377 is great iron sight air pistol and very accurate, way more accurate than me:) I do not believe the standard sights on the 1377 allows it to reach its full potential! So I am going to order a steel breech replacement from crosman so I can experiment with better iron sights and see what happens:) Hope see more 1377 people in the multi pump target arena:) Tony.
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Between 5 to 7 pumps is best for me....actually I think 10 works too....but I'm too lazy to pump the pistol so many times for paper. :o)
For my 1377 I notice if the pumps are less the shots seem to hit left....9 o'clock position.....as the pumps increase, the shots goes toward the right. Haven't chronied it yet.
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THE RECOMMENDATION IS ONLY A MAXIMUN OF 10 PUMPS.