I will add to this spring torque adds a spiral motion to the mix, if side pressure from a shooting stick yoke or similar front rest, or hand hold, can bounce a gun sideways a bit during the shot cycle . Polishing spring ends and adding thrust washers can help remedy that.
The dual piston rifle by Whiscombehttps://www.pyramydair.com/blog/2006/11/whiscombe-rifles-and-barrel-harmonics-part-1-introduction/
Like an FWB 300s ?
Hi Jorgen.I have both multi-pumps and springers ( No PCP's). Most of my springers are gas ram but not all. This is how I shoot all my guns. I place my off-hand out and rest the palm on a tree trunk, door frame, tree branch, log etc. I rest the gun in the Vee formed between the thumb and fingers. The trigger pull (squeeze) may vary from gun to gun but the hold is basically the same. The palm is always facing away from me. If I am shooting off of a horizontal log I just rest my palm on the log and shoot the same way. If don't have anything to rest my palm on, I brace my arm and elbow on my body or knees and shoot the same way. The end result is I am always resting the gun between my fingers and thumb with palm facing away from me. I DO NOT GRIP THE FORE-STOCK. I let the gun float between my thumb and fingers. I shoot this way either standing or sitting with either a rifle or pistol. It is a variation of the artillery hold. I don't think anyone else here in the GTA shoots this way but I have had good results shooting like this. I suppose that you could call it the "Tommy-Boy Hold". You may wish to give it a try and see if it works for you too. Best Wishes - Tom P.S.I can shoot this method in either warm weather or cold. Gloves on or off. I can also shoot like this with heavy mittens on. I have used this method while wearing snow shoes and cross country ski's. I originally started shooting like this, hunting in deep winter, while I was wearing mittens on my hands. I then applied it to everything else, year round. Shooting like this, you can still maintain control of your ski poles. I can even shoot this way with ice & snow on my gloves, whereas the palm flat method is not so good under those conditions.
Quote from: nervoustrigger on August 13, 2018, 09:32:06 AMThe dual piston rifle by Whiscombehttps://www.pyramydair.com/blog/2006/11/whiscombe-rifles-and-barrel-harmonics-part-1-introduction/Very ingenious, but more complicated than what I was thinking. I was thinking about stacking them end to end. Not thinking it would eliminate recoil; but rather reduce the torque that can tug you off target. Being a drop in part would be much more economical than a rare rifle. At least that was my thought...
I have the most success when I find the placement of the front hand or bag on or very close to the balance point of the gun on the fore-grip. Usually no much ahead of the trigger instead of out at the end of the wood. Let the gun do it's thing (recoil / twist / torque) and it will do it the same every time.Don't try to stifle it. I also do not wrap the thumb on my trigger hand around the palm-swell. Let it lie right in line with my trigger finger.
Jorgen :Myket bra ! Basta onskningar - Tom
Quote from: A.K.A. Tommy Boy on August 19, 2018, 08:19:03 AMJorgen :Myket bra ! Basta onskningar - TomHaha tack so mycket! But it is not so "bra" vertical stringing on all targets, something is wrong,
Quote from: AG72 on August 19, 2018, 09:17:48 AMQuote from: A.K.A. Tommy Boy on August 19, 2018, 08:19:03 AMJorgen :Myket bra ! Basta onskningar - TomHaha tack so mycket! But it is not so "bra" vertical stringing on all targets, something is wrong,Not too bad...considering the situation.. RE : "Finaly i got out to shoot again, had realy bad weather, and i got sick and am still with fever but i had to get some air, there is a bit windy today" I hope you feel better. Best Wishes - Tom
Definition of hold sensitivity -As we all know, when a spring-piston gun is fired, the piston is first accelerated forward, and when it reaches the end of the chamber it bounces backwards. The bounce backward happens before the pellet has a chance to move more than a few centimeters down the barrel.The first motion of the piston causes a backward recoil of the gun, the piston bounce causes a forward recoil. By themselves, neither of these two recoils significantly affect accuracy because they both induce a movement in the same direction as the axis of the bore.However, because we are holding the rifle, a reaction force and a reaction torque are produced, which run through our hands (and through any supports on which the rifle rests). This reaction force and torque are required by the law of action and reaction so the gun won't fly away.If this reaction force and reaction torque, which are transmitted to the gun by our hands, are not absolutely consistent from shot to shoot, the direction of the bore axis will change from shot to shot, and so will the POI.Definition of hold sensitivity: "A gun is hold-sensitive when it is difficult for the shooter to consistently supply the reaction forces and moments needed for the gun to stay on target."Basically, hold sensitivity isn't a issue with the gun, but with the shooter.The unwinding of the spring also contributes to this.
"The ability to restrain from grasping the muzzle and wrapping the gun around a tree trunk."Oh... wait... wrong kind of "sensitivity"