 |  | | | |  | |  |  | Pellets from my BENJAMIN NPSS 1200 WENT SUPERSONIC ! |  | |  |  | |
 Posted: Mon Sep 12, 2011 3:04 pm |
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| Manchego |
| New Member |
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| Joined: 16 May 2011 |
| Posts: 4 |
| Location: Caribbean |
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I instilled one drop of Crossman rmc oil in chamber after a "few hundred shots" like the owners manual said, then moved the piston several times without actually cocking it. Went shooting and after about 50 shots with Crossman Dome premier 7.9 gr, 3 or 4 pellets in a row went supersonic with the characteristic "sonic bang". Then I shot the heavier Crossman Dome premier 10.5 gr and it made no sonic boom. I continued to shoot the CDP 7.9gr afterwards and there were no more "sonic booms".The pellets started hitting 2 inches higher and still grouped well, just higher, during the incident.After they grouped on mark as usual.
ANY INSIDES ABOUT THIS SITUATION? IS GOOD? IS IT BAD? TO MUCH OIL? DAMAGE?
Tanks for any insights ![/img] |
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| Posted: Mon Sep 12, 2011 3:23 pm |
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| Manchego |
| New Member |
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| Joined: 16 May 2011 |
| Posts: 4 |
| Location: Caribbean |
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My Rifle !
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| Posted: Tue Sep 13, 2011 3:43 pm |
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| oddtodd |
| Silver Status Member |
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| Joined: 30 Dec 2008 |
| Posts: 2029 |
| Location: Richmond, IN USA |
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| That's called dieseling. It can blow out your seals if it happens too much. You shouldn't need any oil of any type in your rifle. If you feel like you need any type of lube in your rifle you should only use silicone chamber lube from crosman, or silicone diving grease. I don't use any in mine and they have thousands of shots through them. Safe shooting! |
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_________________
Airguns: Two starlings talking "Larry, did you hear that? Larry?? LARRY!!!!" |
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| Posted: Tue Sep 13, 2011 5:18 pm |
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| WhitleyStu |
| Veteran Member |
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| Joined: 15 Feb 2011 |
| Posts: 202 |
| Location: NE Indiana U.S.A. |
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| Since I don't shoot my HW77 much I put a few drops of RWS Air Chamber Lube in it a few months ago. When I got the rifle out last week and shot a few rounds over the chrono it took about forty pellets for the numbers to settle down. It is surprising what it can do to the velocity having a little too much oil in the chamber. |
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