Dead-Eyed Duck Posted April 11, 2009 Report Share Posted April 11, 2009 Right, after missing one or two pigeon this morning I came to the obvious conclusion that the velocity of shot is less with a semi than the same cartridge through my o/u. After all, the energy used in cycling the action on a semi must affect the velocity compared to a non-semi. Has to So, come on then you techies, what's the answer When comparing bullet drop through my semi rimmy, it is always greater than for the same subs bullets through my bolt action Surely, the same has to apply to a shottie No equations please in your answers, just clear, concise answers. Don Quote Link to comment Share on other sites More sharing options...
wymberley Posted April 11, 2009 Report Share Posted April 11, 2009 Hi, Don, As concisely as possble: 1st, shot gun: you missed. 2nd, rifle: the stresses on two different barrels are not the same, you cannot compare them by seeing what the bullet does. The only way is with a chronograph. Quote Link to comment Share on other sites More sharing options...
Imperfection Posted April 11, 2009 Report Share Posted April 11, 2009 Someone on here a while back said that although a semi vents off gasses to cycle-the amount lost is very small and i'd probably agree with that too.My semi has tiny vent holes and the amount which diverts off has got to be negligable. It might be cos one of your guns aims slightly higher or lower than other.I know my semi shoots slightly lower than the O/U which i guess is due to being single barrel. Quote Link to comment Share on other sites More sharing options...
Guest topshot_2k Posted April 11, 2009 Report Share Posted April 11, 2009 the amount of gas used is small, i don't notice any difference between my semi and OU. Quote Link to comment Share on other sites More sharing options...
bruno22rf Posted April 11, 2009 Report Share Posted April 11, 2009 As far as im aware the velocity of the shot only increases over the first 2-3 inches of the barrel-so its already slowing down by the time the gas reaches the vent holes-theres still loads of pressure present but not as much as in the initial discharge sequence.Whilst enough pressure remains to cycle the action its use as a propellant is over and its only use is in preventing a vacuum in the barrel. This would be very different if you were to try black powder cartridges! Quote Link to comment Share on other sites More sharing options...
Doggone Posted April 11, 2009 Report Share Posted April 11, 2009 The energy used to cycle the bolt in a semi auto would be used to jolt your shoulder in a non auto. I doubt it makes any difference to muzzle velocity. Andy Quote Link to comment Share on other sites More sharing options...
Harnser Posted April 11, 2009 Report Share Posted April 11, 2009 The amount of gas used to operate a self loader is minimal . The action only uses residual gas left in the barrel as the bolt cannot unlock untill the shot and wads have exited the barrel . Therefore no loss in velocity . Harnser . Quote Link to comment Share on other sites More sharing options...
stevethevanman Posted April 11, 2009 Report Share Posted April 11, 2009 (edited) actually, the shot has left the barrel before the action has even started cycling, also the shot is probably at top velocity before reaching the venting. Steve Edited April 11, 2009 by stevethevanman Quote Link to comment Share on other sites More sharing options...
Floating Chamber Posted April 11, 2009 Report Share Posted April 11, 2009 actually, the shot has left the barrel before the action has even started cycling, also the shot is probably at top velocity before reaching the venting. Steve Right on! About three feet! There is a delay in the slide moving and the cam unlocking the bolt from the barrel. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.