How to find the sweet spot

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josh3rd

josh3rd

Member
Apr 2, 2015
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Newark, Delaware, United States
How does one find the "sweet spot" when it comes to pcp's? I am a true springer man and fan but as many of you may know, I now have a 22cal game urban and now a chrony.



I always see/read about tuning their pcp to the sweet spot. So for one, what is a sweet spot? Where is the sweet spot? And how does one get to the sweet spot? 

I assume the sweet spot changes with pellet choice so therefore the pellets I have are 15gr and 18gr jsb and sniper lights. 



What do I hope or want to achieve?

1)good accuracy which the jsbs have shown so far

2) well I would like the best blend of power and shot counit like 30-35 shots per fill but I'm negotiable. 

3) Usages? Pesting fom 10-60yds and target shooting from 20yds-100yds. 

if i left anything out that I haven't accounted for please forgive me and let me know. Thank you in advance
 
The "sweet spot" is like *********** hard to explain but you know it when you see it. Each gun even from the same manufacture just like springers has its preferences, shot cycle, pellet etc. Depending on regulated or not can effect the sweet spot. So as an example you fill your gun say 250 bar and out of that fill you get 50 shots, the first 10 come out a little hot, the next 20-30 shots are very accurate (harmonic balance) the last shots are decent but you find your sweet spot is say between 200 bar and 160 bar. Of course this is a rough example and depends a lot on tuning and regulated or unregulated. Thats one reason some like bench shooting tethered. They keep their gun at an exact fill/bar for their guns sweet spot. BTW im getting good accuracy with the 18s around 900-910fps and the hades 16grs around 930-940. Your results may very.
 
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Sonny's explanation is right on the money and made me think of your objectives and goals; and also how these points relate to my own experience.

I'm a bit old fashioned, but I do save most/all of my chrono shot strings for specific PCPs I shoot with at the range. Also take notes from time to time documenting rifle used, pellet type/weight, wind, temp, and/or any recent tuning or other changes I have made. Always chasing the "accuracy" ghost.

That said, I am NOT as good about tracking my air supply as it diminishes from having a full fill, until it goes off the regulator. As an example, I am mindful of my FPS using my chrony for each shot that I take, but I forget to look at my manometer to check air supply and correlate that with a given sweet spot for that rifle during a shooting session. 

So, his point about carefully observing your gun's optimum 'sweet spot' ( i.e., using Sonny's example "say between 200 BAR and 160 BAR"); and establishing that by correlating your Chrono results relative to actual shot accuracy; and finding the best "range" in BAR is worth the effort. The stars have to be aligned: i.e., finding the optimum pellet brand/weight, establishing the optimum FPS, determining the optimum BAR sweet spot, etc. 

This was a good reminder to me that I need to do a better job in tracking my air supply 'sweet spot' and correlate that with chrony/accuracy results as mentioned above.


 
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The harmonic balance sonny speaks of can be found by shooting three shot groups at about 30yards. If the pellets touch or go through the same hole then shoot at 75-100yards. If the group is sub MOA then you are there. If not, you need to change your hammer spring tension slightly and start again at thirty yards then when good out to 75-100 again until you are sub MOA there. Once you are there you will print some very small groups at any range with that projectile.

https://www.airgunnation.com/topic/installed-my-new-700mm-slug-liner-on-my-impact-and-started-tuning/
 
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