Tips on Pistol Shooting

[tirpassion]

Dear bodhi,
As far as I know, the factory set trigger normally comes at 350g+150g (1st pull & 2nd pull) but it may vary from weapon to weapon. My suggestion will be to adjust the trigger weight before starting to shoot with it. You should better get used to what is right for you. You will only know what is right for you after you have checked and set it rightly.
Hope I am clear.

best regards
tirpassion

[bodhijobs]

Arnab da,

But I felt the second pull to be heavier than the first pull, will check again today.

Regards
BD

[brihacharan]

tirpassion wrote:
It is an interesting point. A different approach to trigger control work. A National level coach in France once told me a similar thing. He said that he teaches his students to look at the bull while descending to the aiming area. Then he emphasizes on the idea of associating the trigger pull with the visual perception of travelling in a straight line from the bull to the front sight and through the rear sight notch; the same idea of your steering the shot with the trigger.
This very same gentleman has produced a jewel; a junior shooter who scored an amazing 584 during the district level comp in November and 580 in the Regionals in the weekend of 7/8/9 decemberin AP.
Cut & Paste or click on the link and see the name of ADAMUS Antoine in the JG section (JG= Junior Garçon). 584 is the score of district for qualification and the see the series of 96,97,97,97,96 & 97 = 580 in the regionals.
http://ligue-de-tir-languedoc-roussillo ... 202012.pdf
best regards
tirpassion

> Thanks for the link - Very interesting
Briha

[bodhijobs]

Dear jitu and bodhijobs,

The air pressure is extremely important in the AP. If you are nearing the yellow mark, being still in the green, you should change cylinders. The AP should normally have a constant operating air pressure and quantity for propulsion of the pellet irrespective of the fact that the cylinder pressure is 200 bars. For example, the operating pressure of the Hammerli AP40 is 52 bars. So, in theory, it should work properly even if the pressure cylinder shows 60 bars of pressure (the beginning of the yellow line in my AP). But I avoid to go below the 80 bar imaginary mark.

The next thing is the trajectory of the pellet. In theory, when the projectile travels faster, it should have a longer curve which means that it should hit low in a shorter distance. In case of the projectile travelling slowly, the hits should be high at a shorter distance because of the shorter curve. I am nowhere near to be an expert in ballistics. So, I may be wrong in my conception.

best regards
tirpassion

Arnab da, Guruji and other senior shooters,

I was experimenting with the AP (without touching any setting of course) and tried to see the velocity of the pellet. What I saw is that on one cylinder which is was around the 100 bar mark, the velocity was about 128.3 m/sec (421 fps). Then I changed cylinder and on a cylinder which is just around 200 bars mark, the velocity recorded was 141 m/sec (461 fps).

My question would be that due to drop in velocity like above, will the impact point also not change since at the same distance, the pellets curve will be different?

Though I would like to point out that I was getting the same kind of hit zones/groups from the time when the cylinder was full to when it was around 100 bars mark, however the cuts on the target sheets were not clean from where I understood that the velocity is lesser...

Regards
BD

[airgun_novice]

Dear Bodhijobs,

Irrespective of what they write in their product brochures, the velocity and the trajectory will differ with drop in pressure or very high pressure. Not only that, the pellet will hit at a different location following a divergent path (left or right & high or low). For RH shooters the pellet will tend to go left (why ? dunno) for drop in pressure. For cylinder carrying settings 100-200 bars, I have observed that the pellet trajectory is consistent (of course the pellets are assumed to be consistent ) between 125-175. Good luck with your experiments - hope things settle down fast for you.

[bodhijobs]

Dear Bodhijobs,

Irrespective of what they write in their product brochures, the velocity and the trajectory will differ with drop in pressure or very high pressure. Not only that, the pellet will hit at a different location following a divergent path (left or right & high or low). For RH shooters the pellet will tend to go left (why ? dunno) for drop in pressure. For cylinder carrying settings 100-200 bars, I have observed that the pellet trajectory is consistent (of course the pellets are assumed to be consistent ) between 125-175. Good luck with your experiments - hope things settle down fast for you.

That is very reassuring AGN sir. In fact, you are bang on the point, I got very very tight groups when I was shooting in the range of 180 to around 130-135 bars.

I also hope things settle down fast though I dont mind a bit of experiment here n there...

Regards
BD

[brihacharan]

Dear Bodhijobs,

Irrespective of what they write in their product brochures, the velocity and the trajectory will differ with drop in pressure or very high pressure. Not only that, the pellet will hit at a different location following a divergent path (left or right & high or low). For RH shooters the pellet will tend to go left (why ? dunno) for drop in pressure. For cylinder carrying settings 100-200 bars, I have observed that the pellet trajectory is consistent (of course the pellets are assumed to be consistent ) between 125-175. Good luck with your experiments - hope things settle down fast for you.

That is very reassuring AGN sir. In fact, you are bang on the point, I got very very tight groups when I was shooting in the range of 180 to around 130-135 bars.
I also hope things settle down fast though I dont mind a bit of experiment here n there...
Regards
BD

Hi there,
> As rightly mentioned by AGN either low or high pressure will cause a deviation in the trajectory of the pellet...
> This is simple law of aero-dynamics - its all about air turbulance within the barrel & out in the atmosphere...
> So when the pellet exits the barrel at low pressure into the atmosphere, due the conflict in pressure differences there occurs a certain amount of 'pitching' & 'yawing' of the pellet -
> Hence depending on whether the pressure is high or low this pitching & yawing differs considerably.
> Only experiments will determine on arriving at the right pressure to ensure that the pellet has a reasonably straight flight path.
> This will vary from AP to AP (barrel / rifling / length & valve aperture)
> Lastly the shape / configuration of the pellet also play an important role.
Briha

[tirpassion]

Dear bodhi,

The difference in the velocity is quite considerable; 141m/s and 128m/s (3 to 5m/s of variation is very much acceptable). There will obviously be differences in trajectory and eventual impacts as well explained in the earlier posts. For me, it is not very normal to have 128m/s at 100 bars. The pistol should perform more or less uniformly till it gets locked automatically due to insufficient air pressure (Morini speciality). I would suggest you to
- experiment once again with a full 200 bar cylinder and recording the velocities with each and every pellet till the mechanism gets locked due to insufficient air pressure.
- repeating the same and compare the two data.
- eventually write a mail to Morini directly and explain the fact in details (the pellet used and it's weight).

Hope this helps

best regards
tirpassion

[bodhijobs]

Dear bodhi,

The difference in the velocity is quite considerable; 141m/s and 128m/s (3 to 5m/s of variation is very much acceptable). There will obviously be differences in trajectory and eventual impacts as well explained in the earlier posts. For me, it is not very normal to have 128m/s at 100 bars. The pistol should perform more or less uniformly till it gets locked automatically due to insufficient air pressure (Morini speciality). I would suggest you to
- experiment once again with a full 200 bar cylinder and recording the velocities with each and every pellet till the mechanism gets locked due to insufficient air pressure.
- repeating the same and compare the two data.
- eventually write a mail to Morini directly and explain the fact in details (the pellet used and it's weight).

Hope this helps

best regards
tirpassion

Arnab da,

Shall do this. Though in process of experimentation yesterday, I have damaged the chrono a bit, so in job of getting it fixed again (only physical damage).

However I was doing a net search on this and came across a similar topic and the velocities reported are even more varying than mine, its around 126.5 m/s @ 100 bars and 137.5 @ 150 bars...please see the link:

http://www.targettalk.org/viewtopic.php?p=66834

Another issue could be the consistency of Mastershot Yellow pellets, they might not be that much consistent.

Regards
BD

[bodhijobs]

Here is the update, since the chrony is still not up and running, went without it.

The cut off set in after about 123 shots at approx 80 bars, ie the gauge is between green last mark and yellow first mark.

Worth to note that even just before the cut off, I didnot really find any pellet droop at 10 meters. However, I did understand that the velocity was slower than when it was full by looking into the cut marks on the target sheet.

Regards
BD

[airgun_novice]

Dear Jitu,
Isn't there some shooting comp in Jaipur during the month of Jan that's open to all ? Can you please post the details ? Thx, bro
regs
A.

[jitu sati]

sorry guys was out of town. anyway agn the Dr karni SIngh shooting comp is usually held in Jan. had contacted the organisers. dates not yet decided. will let you know when i hear from them. in the meantime a very happy new year to all the IFG guys and especially to TOPS people. may we all shoot better this year

[bodhijobs]

Happy New Year to One and All.

May all our wishes come true this year around...

[jitu sati]

hey tir have started prac again after returning from trip. did a complete 40 shot shoot. could hold on to the 9 ring for most of the shots. so it felt nice. since i was doing the 9 ring drill i dont know the score. but the 8 shot self kicks are certainly reducing

[tirpassion]

Dear jitu,
carry on with the good work. Till the moment you are inquisitive about the score you must not shoot on the fresh comp target. You should detach yourself from score and be happy about good shooting. The day our mental/technical prowess eliminates the 8, we will attack the 9 . The mental frame will be 'i know that I do not shoot 8s so my aim is to have the center ring only.'
best regards
tirpassion