Good shot? Posted June 8, 2017 Report Share Posted June 8, 2017 Have your power setting at its highest and with the heaviest weight pellet available (over a chrono) to give maximum ft/lbs that gun is capable of with that heavy pellet. It should be set to give less than 12 ft/lbs (eg 11.3ft/lbs) if over the legal limit. Then only use a lower pellet weight of choice to give you best velocity/ trajectory. A lower pellet weight will give you a faster and flatter trajectory but with less energy. You should not be over powered in law as long as you only use a lighter weight pellet but it is always advisable to check this occasionally over a chrono Quote Link to comment Share on other sites More sharing options...
Guest Posted June 8, 2017 Report Share Posted June 8, 2017 I am not. The equation is correct but you dont understand it. The rifle power once set is fixed. Changing the pellet mass will alter the velocity not the power. The equation shows you how mass and velocity are related but power is fixed and is only changed by manual adjustment. You cannot alter the power of your rifle by changing the pellet. Dont get confused by how ftlb drops with distance. Thats a different thing. Quote Link to comment Share on other sites More sharing options...
Newbie to this Posted June 8, 2017 Report Share Posted June 8, 2017 (edited) I am not. The equation is correct but you dont understand it. The rifle power once set is fixed. Changing the pellet mass will alter the velocity not the power. The equation shows you how mass and velocity are related but power is fixed and is only changed by manual adjustment. You cannot alter the power of your rifle by changing the pellet. Dont get confused by how ftlb drops with distance. Thats a different thing. That only stands if the pellet used to set the ft lb energy initially, was the heaviest pellet on the market. Edited June 8, 2017 by Newbie to this Quote Link to comment Share on other sites More sharing options...
Guest Posted June 8, 2017 Report Share Posted June 8, 2017 That only stands if the pellet used to set the ft lb energy initially, was the heaviest pellet on the market. It doesnt matter what they use, the power rating will be the same. They probably test with a few weights but the power rating, as per that equation, will come out about the same. To be safe manufacturers dont normally use higher than 11.5 ftlbs. Anyone with a chrono: pls go out and measure your velocities with different pellets. Plug the mass and velocity values into the equation and lets see what power values you come up with. This is an old wives tale that needs killing off. Quote Link to comment Share on other sites More sharing options...
Mice! Posted June 8, 2017 Report Share Posted June 8, 2017 I would go do it now but I only have accu pell, I will just have to wait for someone else to show the error of your thinking Quote Link to comment Share on other sites More sharing options...
Newbie to this Posted June 8, 2017 Report Share Posted June 8, 2017 https://forums.pigeonwatch.co.uk/forums/topic/148981-the-12-ftlbs-law-versus-pellet-weight/ I would go do it now but I only have accu pell, I will just have to wait for someone else to show the error of your thinking I just got my chrony out but only have AA field, thought I had some bisley somewhere but can't find them. Quote Link to comment Share on other sites More sharing options...
ips Posted June 8, 2017 Report Share Posted June 8, 2017 Surely if measured at muzzle rather than observed velocity then any difference between weight of pellets would be minuscule if indeed even measurable. ?" Quote Link to comment Share on other sites More sharing options...
Rewulf Posted June 8, 2017 Report Share Posted June 8, 2017 It doesnt matter what they use, the power rating will be the same. They probably test with a few weights but the power rating, as per that equation, will come out about the same. To be safe manufacturers dont normally use higher than 11.5 ftlbs. Anyone with a chrono: pls go out and measure your velocities with different pellets. Plug the mass and velocity values into the equation and lets see what power values you come up with. This is an old wives tale that needs killing off. Ok one last time, when you refer to power, you are referring to muzzle energy ? Theoretically you could have a slower muzzle velocity, but with a heavier projectile, a higher muzzle energy. An old wives tale ? This is basic science ! Throw a brick at 10 mph , or a pebble at 20 mph ,which would you prefer to bounce of your bonce? Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 8, 2017 Report Share Posted June 8, 2017 Hi dc 177 . I see you are hell bent on your way of thinking .and i see how you have got there . I will do that experiment for you this evening as i have a perfect gun and many many different pellets of different weights .i will post the findings and we then can all see how pellet weight may or may not effect the muzzle energy . Sound good to every body ? Quote Link to comment Share on other sites More sharing options...
Newbie to this Posted June 8, 2017 Report Share Posted June 8, 2017 Hi dc 177 . I see you are hell bent on your way of thinking .and i see how you have got there . I will do that experiment for you this evening as i have a perfect gun and many many different pellets of different weights .i will post the findings and we then can all see how pellet weight may or may not effect the muzzle energy . Sound good to every body ? Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 8, 2017 Report Share Posted June 8, 2017 Cheers .in fact i will go so far as to do this with a few guns .think will use a bsa ultra .177 A bsa lightening .177 and a hw30 .177 So we have pcp .and springer and a low energy springer . I only have one .22 at the mo and its a fac .so dont want to use that . Pellets on test will be .light med heavy and different manufacturers So probably falcons 7.3 grn .jsb exact 8.44 grn .jsb heavies 10.3 grns Rws hobbys 7 grns .rws superdomes 8.3 grns .bisley mags 10.5 grns extreems at 9.5 grns That should do it .?? Quote Link to comment Share on other sites More sharing options...
Guest Posted June 8, 2017 Report Share Posted June 8, 2017 Happy with that. Just use the chrono at muzzle velocity, yeh? Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 8, 2017 Report Share Posted June 8, 2017 Yep i will use a combro chronograph at the muzzle and record velocity and the energy of each pellet allowing for the correct weight of the pellet .each pellet will be shot 3 times and an average taken . Im happy to do this .it must have been at least 3 or 4 months since i did this last . With a gun Quote Link to comment Share on other sites More sharing options...
walshie Posted June 8, 2017 Report Share Posted June 8, 2017 A heavier pellet gives more energy in a PCP and a lighter pellet gives more energy in a springer. Quote Link to comment Share on other sites More sharing options...
Mice! Posted June 8, 2017 Report Share Posted June 8, 2017 Crack on stu, I've found about twenty bisley pest control but won't have chance to do anything till tomorrow now. Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 8, 2017 Report Share Posted June 8, 2017 Results are in . In the end i decided to only use my bsa ultra and xl lightening I was running out of time so i decided to ditch the hw 30 .it follows the same pattern as the xl anyway just at lower power levels . Also i dropped a couple of pellets and went with 5 types . Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 8, 2017 Report Share Posted June 8, 2017 So first up the xl .this is a springer not a gas ram Falcons 7.3 grn 844 fps 11.57 Fpe Exact 8.44 772 11.13 Jsb heavy 10.3 663 10.07 Co2 pell 7.0 829 10.70 Bis mags 10.5 637 9.36 Next was the bsa ultra Falcons 805 10.51 Exact 766 10.94 Heavy 700 11.23 Co2 808 10.16 Bismags 699 11.30 Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 8, 2017 Report Share Posted June 8, 2017 So my guns follow convention Pcps generally make more energy with heavy pellets And springers more with lighter ones . But as you can see there are a few exceptions . Falcons at 7.3 grns are heavier than the 7 grn c02 pells at 7 grn but make more energy through the springer Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 8, 2017 Report Share Posted June 8, 2017 What is annoying is that i spaced all that info out nicely but the forum has compressed it all so its harder to read .sorry . Anyway .as its clear the pellet type can make a massive difference to muzzle energy . Over 2 fpe with the springer and 1.2 fpe with the pcp . But thats just these 2 guns others may be different . (Yeah not by much tho ) Just so you know 10.5 grns in .177 tends to be the heaviest you can go before the energy starts to drop again . I know i have 13 grn pellets 15 grn pellets 16 grn pellets in .177 and they dont go up, they start to drop again Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 8, 2017 Report Share Posted June 8, 2017 Pellets I dropped the superdomes Quote Link to comment Share on other sites More sharing options...
ips Posted June 8, 2017 Report Share Posted June 8, 2017 My head hurts 😁 Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 8, 2017 Report Share Posted June 8, 2017 Why .? Quote Link to comment Share on other sites More sharing options...
ips Posted June 8, 2017 Report Share Posted June 8, 2017 Its all very confusing Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 8, 2017 Report Share Posted June 8, 2017 Just so its easier to read Springer Falcons 11.57 fpe Exact 11.13 Heavy 10.07 Co2 10.7 Bismags 9.36 Ultra Falcons 10.5 Exact 10.94 Heavy 11.23 Co2 10.16 Bismags 11.3 Quote Link to comment Share on other sites More sharing options...
ips Posted June 8, 2017 Report Share Posted June 8, 2017 There seems to be no formula. Some pellets higher with pcp some higher with springer. ?? Quote Link to comment Share on other sites More sharing options...
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