I had one on .22 and power dropped when the gas ram cartridge failed on me when it was very new. Check your breech seal....and if its sealing think of a failed ram the same as a busted spring. Springs are consumables.
To check breech sealing either cover with sheet of toilet paper and fire with a pellet or fill a old section of panty hose leg with talc power and dust area over breech and fire with a pellet
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