Pcp airgun variation how much do you find acceptable.

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BenSeager

BenSeager

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Jun 7, 2016
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MI, United States
I recently purchased an FX Impact .30 and a .22 barrel kit. I did as much research as I could I really liked the design and I wanted to challenge my self with a bullpup. But I was after the power for hunting most of all. With all the adjustments that could be made and supposing 870 fps out of the box with more or less as needed I was all in. Then it came and 820 fps 140 bar max setting all around. To be honest not sure how to take it. I called AOA and choice was to attempt to adjust the reg up toward 150 or to send it in. But how much varation from the expectation a vendor claim do you all think is acceptable? 82 ft pds out of the box vs now 73-4ish at 860 fps sitting on the verge of warranty voiding? Thoughts to help manage my future expectations would be amazing.
 
It sounds like your regulator is set too low. But the manometers for the regulators are not super accurate. If you have the ability to increase the regulator pressure without voiding the warranty then by all means try that. Otherwise I would ask for a return shipping label and send it back for them to get it running up to advertised specs.
 
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Normally, I would say that it's fairly common for the advertised numbers to be higher than what you get in real world use. Most manufacturers use extra light pellets so they can advertise the highest fps in perfect conditions etc. With 30 cal guns it's different though. The choice of pellets is limited to 44gr or 50gr for the most part. 

You didn't mention which pellet you were using. If you are using the heavier 50gr, then you would expect the speed to be lower. 

For me, the main issue would be the accuracy. If it's accurate at 820 then I would leave it alone. There isn't much that would survive a hit at 820fps but die if it was 860fps. Plus, more power typically means less shots and more noise. 

How many shots did you measure btw? There are a number of threads with people talking about the first one or two shots having less power on regulated guns. 

I would also wait until the reg settled in but that's just me. I don't like to send away new guns or mess with them if they're already accurate. 
 
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Yes I have tried all the adjustments and taken the slack from the power wheel. I have chronied about 500 with 44.75 at this point and about 125 in 50g. Before touching the reg I got it up to avg of about 830fps with 44.75 jsb and 790 on the 50s ES is roughly 22 on each SD was between 4 and 7 was at 58 shots on reg.

Talked with AOA and decided to bp the reg a bit now in 44.75 avg about 865 with a SD of 5ish ES 23 at about 3.5 hash on valve and max on wheel. But I digress for me it may just me managing expectations that needs an adjustment I did a synrod for 800 dollars and am much tighter statstically 890fps in .25 Sd 4 consistantly es of 17 and get 32 shots on a 3k fill. This impact impact for 2000 just doesnt feel as impressive for some reason .30 itself is impressive no doubt.
 
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"BenSeager"
Talked with AOA and decided to bp the reg a bit now in 44.75 avg about 865 with a SD of 5ish ES 23 at about 3.5 hash on valve and max on wheel.
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865 sounds about right. The .25 pellets are not as efficient as the .30 pellets. A SD of 5 and ES of 23 is not bad for a new gun, it will likely tighten up with more use.

Glad you were able to get her up to speed.
 
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At this point yes but they consider 870 their fac recommendation its supposed come out of the box doing so at 140 bar to be able to go up and down from there and like i said i am probably pushing it on the reg so I wonder with some people having much higher values from the get go if I shouldnt send it in bcause something maybe flawed and may end up breaking now that the reg pressure is up and its working harder to make those numbers. I havent been into pcp that long but spending that money I dont want the power without longevity. When I have seen posts of 920 fps claiming to be at 140 bar its concerns me abit. Maybe more than it should. I suppose I could just send it in for a once over I but it really feels like we waited forever for it to arrive. As this one was for my wife and I was gonna order another for myself I thought I would ask how people felt about such variations. I would like to do larger game and was cosidering deer as a possibility not decided on the ethical nature of that as of yet but I would like mine to fire a bit on the hotter side within reason for as large a game as possible and of course I liked the idea of a regulated gun with moderate shot count that can be turned down for a day of plinking with the wife.
 
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Sorry this was not meant to be a fix me post. Really just asking the title question on expectations on new highend purchases vs company claims... What do you find to be acceptable margins of error i.e. box labels and website claims vs your actual results. And deer was a bad example lets just say boar. Wife doesnt hunt deer just popped into my head always use the right tool for the job...
 
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Where did you hear 920 fps? Typically they ship their regulators set at max which is 150 bar and translates to about 870 fps with king heavies.

Mine maxes out about 880 fps with the power wheel on max & the valve on 4.

If you're seeking more power you may want to adjust the hex screw that controls the power wheel. Watch Ernests video on how to. Or have you already maxed it out?
 
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High Speed is not the solution for accurate pellets.
Pellets are not designed to be more accurate at higer speed.
Take a look at Olympic competition.
They shoot aaroud 500 fps.
Again this Impact is maybe not the air rifle you need.
For the price again it is a question of personal budget.
I have own fire arms rifle that valued 25K and vever been able to fine tune it enough for my demand.
This was not a gun for me period.
So I sold it and get a 5k $ that still satisfied me for 27 years.
 
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"BenSeager"My 22 barrel was at 1048 before i bumped the reg tuning .30 barrel

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That is waaaay too hot!
1. Soft lead pellets can lose their integrity at that speed.
2. You are risking damage to the shroud/end cap because of above. 
3. Unlike traditionally rifled barrels, SmoothTwist barrels operate best right around 900 fps or below. I believe Ted found the best accuracy with the JSB Heavies to be in the mid 800's.
 
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