At 17 fpe mine seemed to be pretty hold sensitive with 8.4's, 8.6's and 10.8's. At 12.5 it's much more controllable.I concur. It's not all about fitting plastics and thinking your new damped gun is doing the business because it feels and sounds deader.
In practise, out on target at 40 yds you will find its no different on target but you just lost 1 inch of drop due to slowing the gun down. Equally with very light pellets that Steel Top hat is going to hit home a bit harder at the base of the chamber than it should.
I suspect AA set it up with some mid weight 8.4s to 10s maybe a mid point of .177 and .22 but then get critisised when someone comes along with his 7 grains...and goes off and fits a plastic kit...
Don't forget your plastic kit much more temp sensitive to ambient temp diff too.
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