Could it be that the barrel needs cleaning, is it blocked or it could even be bent if it has been dropped, you wouldn't see this with the ***** eye but a good gunshop should be able to define the barrel as true.
SOURCE: I need a manual for a crossman Model 160 pellet rifle
Here is a link to the entire Crosman manual. Scroll down the page to the 160 model and download the owner's manual free.
http://www.crosman.com/airguns/service/manuals/crosman-rifles
Testimonial: "This was a termendious help. Thank uou very much Charles"
SOURCE: I need a parts diagram for a benjamin sheridan
you can find parts diagram in crossman web page under other help compleat dig with part#s
SOURCE: need parts for a benjamin franklin air rifle moel
http://www.crosman.com/airguns/service/repair
I couldn't find the model 317, But crosman bought benjamin, sheridan. Check it out.
SOURCE: Benjamin Marauder air rifle is leaking air ????
I presume you've solved this problem by now. But for future reference, the Marauder "Owner's Manual" explains why this may happen, and how to solve this problem!
"TIP: If your airgun is being filled from completely empty (zero pressure) the tension of the hammer pressing against the valve may keep the valve open which will cause air to leak down the barrel. This is most likely to happen with a gun tuned for a high fill pressures, where the hammer spring preload is adjusted to a high rate. In the event this occurs try cocking the bolt and leaving it in the rear (fully open) position to eliminate
the force on the valve allowing it to close. Always make certain the airgun is not loaded and there is not a pellet in the chamber."
SOURCE: Benjamin 392 air rifle leaks
Put oil in barrel in chamber and clean out dirt with compressed air.
BE CAREFUL
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