Author Topic: How to obtain the maximum Power from a PCP  (Read 244 times)

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Offline 21grains

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How to obtain the maximum Power from a PCP
« on: November 24, 2018, 12:12:18 AM »
https://hardairmagazine.com/ham-columns/how-to-obtain-the-maximum-power-from-a-pcp-air-rifle/

Not much use in 12flb Land, but Knowledge is a Good Thing.....Franky

Ps. Gareth if This is a Bad Power "Rules" Post, Please Delete if Needed Thank's.....

Offline Gambo

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Re: How to obtain the maximum Power from a PCP
« Reply #1 on: November 25, 2018, 07:37:08 PM »
Not at all Franky. ;)

We have summat called 'Anti-Tamper' here in the UK which stops any attempts to illegally raise power above the 12ftlbs limit (unfortunately it also stops the owner from lowering the power of his air rifle should it creep slightly over to remain within the law ::))....and, if it was removed from here, it's only a simple task to log-on to Hard Air Magazine's website (or any one of many thousands of airgun websites from around the world) to view it anyway.........so that's two reasons that not allowing it to be seen on Planet Airgun is a bit irrelevant in my mind. :-\ :-\

Offline edtwozeronine

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Re: How to obtain the maximum Power from a PCP
« Reply #2 on: November 29, 2018, 11:43:45 PM »
Surely it's a bit of a balancing act to get power Vs accuracy to a nice balance. Ted from Ted's Holdover (Youtube channel) had a HW100 at the higher end of what it's capable of in .22 and he reckoned it was too hot, aka inaccuracy caused by going for too much power. I think generally he uses the bigger calibre FX Airguns for pest control around the farm-land he has access to, but he did mention the accuracy of a sub-12 ft/lb HW100 he got his hands on was very impressive, hence his disappointment at the hotted up version.

Offline Gambo

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Re: How to obtain the maximum Power from a PCP
« Reply #3 on: December 02, 2018, 01:19:09 PM »
That's correct Mike.....as there's only so much power can take before it gets deformed in the barrel by the blast of air behind it, which then compromises accuracy.

Difference pellets have varying levels of resistance to this....Accupels can only go to the early to mid 20ftlbs or so before accuracy suffers. JSB/AAF's can go to the mid 30's+. Something like Bisley Magnum or H&N Cuda's can go even higher. Given the 3 examples I've mentioned, it's no coincidence that as a general rule of thumb, the more the pellet weighs, the more power it can handle before accuracy goes off.

So......it's not just a case of upping the power......you need to either up the power to the limit of what your chosen pellet can handle, or find a different pellet that gives accuracy if you want to achieve a specific very high power output.

Offline 21grains

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Re: How to obtain the maximum Power from a PCP
« Reply #4 on: December 02, 2018, 05:14:49 PM »
That's correct Mike.....as there's only so much power can take before it gets deformed in the barrel by the blast of air behind it, which then compromises accuracy.

Difference pellets have varying levels of resistance to this....Accupels can only go to the early to mid 20ftlbs or so before accuracy suffers. JSB/AAF's can go to the mid 30's+. Something like Bisley Magnum or H&N Cuda's can go even higher. Given the 3 examples I've mentioned, it's no coincidence that as a general rule of thumb, the more the pellet weighs, the more power it can handle before accuracy goes off.

So......it's not just a case of upping the power......you need to either up the power to the limit of what your chosen pellet can handle, or find a different pellet that gives accuracy if you want to achieve a specific very high power output.

I find through My testing and Hunting,Crosman  .22 CPs are in fact best(accuracy) at 24flb 875fps in (My Guns)

825--875 .22 & .177 is what the "TESTERS"  talk up as Best.....Franky

Offline Gambo

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Re: How to obtain the maximum Power from a PCP
« Reply #5 on: December 02, 2018, 05:56:58 PM »
Certainly what will ruin accuracy, is a pellet velocity which is 'trans-sonic'.......in other words, crosses through the sound barrier (around 1080fps at sea level) as it sheds speed in flight, and so gets destabilises as it goes through.

A pellet should always stay completely above, or below, the sound barrier for best accuracy potential.