Ozzy Fudd Posted July 19, 2009 Report Share Posted July 19, 2009 im playing about on a ballistics calculator and just wondering. the ammo i use has a muzzle velocity of 1150 fps (as per the manufacturer), but im using a 10/22 semi auto. now this might be a very stupid question (if so i apologise), but would i be right in saying that the muzzle velocity in a bolt action .22lr will be higher than in a semi, due to the fact that some of the power from the round is used to cycle the bolt and feed the next round? this is what i always thought anyway. so assuming im right, the main question is does anyone have any idea how much the muzzle velocity drops in a semi auto compared to a bolt action? cheers Quote Link to comment Share on other sites More sharing options...
Blunderbuss Posted July 19, 2009 Report Share Posted July 19, 2009 (edited) The amount of gas tapped off to cycle the action is tiny and would IMO have a negligible effect on MV. I'm sure other variables like barrel length, air temperature etc would have much more effect. Edited July 19, 2009 by Blunderbuss Quote Link to comment Share on other sites More sharing options...
Baldrick Posted July 19, 2009 Report Share Posted July 19, 2009 The amount of gas tapped off to cycle the action is tiny and would IMO have a negligible effect on MV. I'm sure other variables like barrel length, air temperature etc would have much more effect. Blunderbuss, the 10/22's action is recoil-activated, rather than a gas-driven piston. I think that also applies to all other .22LR/WMR semi-autos. I've never seen any figures relating to it, but I too imagine the reduction in MV is negligible. Quote Link to comment Share on other sites More sharing options...
Blunderbuss Posted July 19, 2009 Report Share Posted July 19, 2009 Doh, I knew that! But as you say, the answer is the same. Quote Link to comment Share on other sites More sharing options...
Ozzy Fudd Posted July 19, 2009 Author Report Share Posted July 19, 2009 Blunderbuss, the 10/22's action is recoil-activated, rather than a gas-driven piston. I think that also applies to all other .22LR/WMR semi-autos. I've never seen any figures relating to it, but I too imagine the reduction in MV is negligible. sorry should have pointed that out in the original post that it was recoil operated so general consesus seems to be that it wont be much, maybe 10fps? Quote Link to comment Share on other sites More sharing options...
Floating Chamber Posted July 19, 2009 Report Share Posted July 19, 2009 The bullet is usually 3 feet from the barrel before the bolt opens. I suspect very little drop. Quote Link to comment Share on other sites More sharing options...
Ozzy Fudd Posted July 19, 2009 Author Report Share Posted July 19, 2009 The bullet is usually 3 feet from the barrel before the bolt opens. I suspect very little drop. ah right, cheers, didnt know that Quote Link to comment Share on other sites More sharing options...
Harnser Posted July 19, 2009 Report Share Posted July 19, 2009 The action on a recoil operated .22 rimfire and on a gas operated shotgun is regulated so that it cannot open untill the gas pressure has reduced conciderably ,other wise you wouldhappen . have high pressure gas coming back into your face , not a very plesant thing to have . Asfar as a difference in M.V. nothing that would be noticable . Harnser . Quote Link to comment Share on other sites More sharing options...
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