Stingrey 0 Posted March 20, 2015 Report Share Posted March 20, 2015 (edited) Right lets sort this out...... Kinetic Energy at the muzzle is calculated by using the following calculation: E=WxV2/K I have tried numerous pellets and the results are conclusive in that a heavier pellet will decrease muzzle velocity for any given power as to will a pellet that is too light. Here is an example.... Take my favourite pellet JSB Exacts in .177 (8.44g) passed through my Airwolf at 790ft/s that equates to 11.7ft/lb Then Take the H&N Barracudas Match in .177 (10.4g) passed through my Airwolf at 685ft/s that equates to 10.8ft/lb Then Take the Daystate Li .177 (7.9g) passed through my Airwolf at 805ft/s that equates to 11.4ft/lb. You can see from the results that there is a sweet spot for the riffle in terms of the weight of the pellet and no doubt there are even more complex calculations that the manufacturers use to set a rifle to in order to prevent a sub 12ft/lb rifle from ever breaching the legal limits. One of the most efficient heavy pellets in most guns are jsb heavies 10.3gr Well I guess my results show that not to be the case. Maybe it differs with a springer but through my Airwolf they certainly aren't. Edited March 20, 2015 by Stingrey Quote Link to post
villaman 9,979 Posted March 20, 2015 Report Share Posted March 20, 2015 Right lets sort this out...... Kinetic Energy at the muzzle is calculated by using the following calculation: E=WxV2/K I have tried numerous pellets and the results are conclusive in that a heavier pellet will decrease muzzle velocity for any given power as to will a pellet that is too light. Here is an example.... Take my favourite pellet JSB Exacts in .177 (8.44g) passed through my Airwolf at 790ft/s that equates to 11.7ft/lb Then Take the H&N Barracudas Match in .177 (10.4g) passed through my Airwolf at 685ft/s that equates to 10.8ft/lb Then Take the Daystate Li .177 (7.9g) passed through my Airwolf at 805ft/s that equates to 11.4ft/lb. You can see from the results that there is a sweet spot for the riffle in terms of the weight of the pellet and no doubt there are even more complex calculations that the manufacturers use to set a rifle to in order to prevent a sub 12ft/lb rifle from ever breaching the legal limits. One of the most efficient heavy pellets in most guns are jsb heavies 10.3gr Well I guess my results show that not to be the case. Maybe it differs with a springer but through my Airwolf they certainly aren't. Well I guess my results show that not to be the case. It may well be with a springer but not in my airwolf Cant see any results showing JSB heavies Quote Link to post
Stingrey 0 Posted March 20, 2015 Report Share Posted March 20, 2015 Right lets sort this out...... Kinetic Energy at the muzzle is calculated by using the following calculation: E=WxV2/K I have tried numerous pellets and the results are conclusive in that a heavier pellet will decrease muzzle velocity for any given power as to will a pellet that is too light. Here is an example.... Take my favourite pellet JSB Exacts in .177 (8.44g) passed through my Airwolf at 790ft/s that equates to 11.7ft/lb Then Take the H&N Barracudas Match in .177 (10.4g) passed through my Airwolf at 685ft/s that equates to 10.8ft/lb Then Take the Daystate Li .177 (7.9g) passed through my Airwolf at 805ft/s that equates to 11.4ft/lb. You can see from the results that there is a sweet spot for the riffle in terms of the weight of the pellet and no doubt there are even more complex calculations that the manufacturers use to set a rifle to in order to prevent a sub 12ft/lb rifle from ever breaching the legal limits. One of the most efficient heavy pellets in most guns are jsb heavies 10.3gr Well I guess my results show that not to be the case. Maybe it differs with a springer but through my Airwolf they certainly aren't. Well I guess my results show that not to be the case. It may well be with a springer but not in my airwolf Cant see any results showing JSB heavies Apologies I was talking about H&N Barracuda Match pellets @ 10.4gr. Quote Link to post
secretagentmole 1,701 Posted March 21, 2015 Report Share Posted March 21, 2015 I think .177 flying at averages of 700-800 and .22s going at only 500-600 shows that heavier pellets go slower Test same gun with 11.9 hobby 14.3 accupel and 16 aa fields and then 20 ish grain bisley mags and see the differences mate. I would if my chrono wasnt annoying to set up lol He can't test a .177 with 14.3 Accupel, they are .22! Quote Link to post
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