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Pellet Gun Question?!?

Old 06-04-2009, 06:27 AM
  #1  
Nontypical Buck
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Default Pellet Gun Question?!?

I recently bought a Gamo Big Cat 1200 .177 cal air rifle and I have a few questions that I'm hoping someone can answer.

When I first got the gun I shot GAMO's BPA RAPTOR ammo, (the gold ammo that's suppose to make your gun break the sound barrier) and lead hollow point pellets. When I shot the BPA ammo I got the sonic "crack" that was described on the ammo's package. Then about 5 days later I go to shoot the same ammo again and no super sonic "crack"? The only thing that I can think of that may be causing this to happen is that I shot about 400 lead pellet in between the first time I fired the BPA ammo and the second time. Could me shooting 400 lead pellet weaken the spring and in turn lower the F.P.S.?

I'm in a quandary, should I keep the gun or return it? I don't want a gun that will get weaker and weaker as I fire it.
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Old 06-04-2009, 08:09 AM
  #2  
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Default RE: Pellet Gun Question?!?

I can think of two things.

1-loss of compression. Kind of like an engine. A 30 year old V8 engine seems a lot more "tired" than when it was new.

2-lead build up in the bore. Try cleaning it real well and see if that helps.
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Old 06-04-2009, 11:43 AM
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Default RE: Pellet Gun Question?!?

I'm no spring piston pellet gun expert but I have done some serious background on them in the last couple of years. I have a very similar model rated at exactly the same speeds using the same pellets. Some conclusions about them -

1. spring piston pellet rifles don't really fit in deer forums

2. shoot one thru a chrono, unless you are using those PBA pellets you won't even get close to 1200 fps

3. pellet weight is critical to pellet gun efficiency, you have to match pellets with rifle...ie powerful rifles require heavier pellets, lighter rifles, lighter pellets. If you shoot very light pellets in a powerful rifle you will damage the spring assembly of the spring piston, it slams the stops too hard. Never ever dry fire your rifle, not even once. worse thing you can do to one.

4. I know those pellets come with the gun but Gamo doesn't really care how fast you wear out the piston assembly. Your rifle requires pellets weighting at least 8 gr. for max life.

5. forget the sonic crack, with 8 gr. pellets your rifle will do around 900 fps....tops. I shoot mine thru a chrony all the time.

6. never leave the gun cocked, if you change your mind on a shot, fire a pellet into something that will safely stop it

7. Best upgrade for your pellet rifle is a GRTII trigger replacement. Costs $32 and takes five minutes to install. It will make a much better shooter out of your gun by removing the take up and giving you a clean break trigger more like a centerfire rifle.

8. If you want a great site to go to about these guns charliedatuna.com guy knows more about spring piston guns than he should.

9. Never clean a pellet rifle unless you know exactly what you are doing. The bore is not chrome moly on most of them and even the slightest touch of a cleaning rod can harm it. Better to never clean than incorrectly clean.
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Old 06-04-2009, 12:57 PM
  #4  
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Default RE: Pellet Gun Question?!?

ORIGINAL: skb2706

I'm no spring piston pellet gun expert but I have done some serious background on them in the last couple of years. I have a very similar model rated at exactly the same speeds using the same pellets. Some conclusions about them -

1. spring piston pellet rifles don't really fit in deer forums

2. shoot one thru a chrono, unless you are using those PBA pellets you won't even get close to 1200 fps

3. pellet weight is critical to pellet gun efficiency, you have to match pellets with rifle...ie powerful rifles require heavier pellets, lighter rifles, lighter pellets. If you shoot very light pellets in a powerful rifle you will damage the spring assembly of the spring piston, it slams the stops too hard. Never ever dry fire your rifle, not even once. worse thing you can do to one.

4. I know those pellets come with the gun but Gamo doesn't really care how fast you wear out the piston assembly. Your rifle requires pellets weighting at least 8 gr. for max life.

5. forget the sonic crack, with 8 gr. pellets your rifle will do around 900 fps....tops. I shoot mine thru a chrony all the time.

6. never leave the gun cocked, if you change your mind on a shot, fire a pellet into something that will safely stop it

7. Best upgrade for your pellet rifle is a GRTII trigger replacement. Costs $32 and takes five minutes to install. It will make a much better shooter out of your gun by removing the take up and giving you a clean break trigger more like a centerfire rifle.

8. If you want a great site to go to about these guns charliedatuna.com guy knows more about spring piston guns than he should.

9. Never clean a pellet rifle unless you know exactly what you are doing. The bore is not chrome moly on most of them and even the slightest touch of a cleaning rod can harm it. Better to never clean than incorrectly clean.
Thank you so much! Could you please post or PM me the link to where I can get the GRTII trigger replacement for $32. Thanks!


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Old 06-04-2009, 01:03 PM
  #5  
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Default RE: Pellet Gun Question?!?

charliedatuna.com
ORIGINAL: 8pt~Bowhunter

ORIGINAL: skb2706

I'm no spring piston pellet gun expert but I have done some serious background on them in the last couple of years. I have a very similar model rated at exactly the same speeds using the same pellets. Some conclusions about them -

1. spring piston pellet rifles don't really fit in deer forums

2. shoot one thru a chrono, unless you are using those PBA pellets you won't even get close to 1200 fps

3. pellet weight is critical to pellet gun efficiency, you have to match pellets with rifle...ie powerful rifles require heavier pellets, lighter rifles, lighter pellets. If you shoot very light pellets in a powerful rifle you will damage the spring assembly of the spring piston, it slams the stops too hard. Never ever dry fire your rifle, not even once. worse thing you can do to one.

4. I know those pellets come with the gun but Gamo doesn't really care how fast you wear out the piston assembly. Your rifle requires pellets weighting at least 8 gr. for max life.

5. forget the sonic crack, with 8 gr. pellets your rifle will do around 900 fps....tops. I shoot mine thru a chrony all the time.

6. never leave the gun cocked, if you change your mind on a shot, fire a pellet into something that will safely stop it

7. Best upgrade for your pellet rifle is a GRTII trigger replacement. Costs $32 and takes five minutes to install. It will make a much better shooter out of your gun by removing the take up and giving you a clean break trigger more like a centerfire rifle.

8. If you want a great site to go to about these guns charliedatuna.com guy knows more about spring piston guns than he should.

9. Never clean a pellet rifle unless you know exactly what you are doing. The bore is not chrome moly on most of them and even the slightest touch of a cleaning rod can harm it. Better to never clean than incorrectly clean.
Thank you so much! Could you please post or PM me the link to where I can get the GRTII trigger replacement for $32. Thanks!
Never mind, I found it! Thanks again!
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Old 06-19-2009, 07:57 PM
  #6  
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Default RE: Pellet Gun Question?!?

I shoot crossman hallow points in stead of the pba i honeslty cant tell a difference. Im stil smackin birds at 65 yards of the phone wire. My frinend got a cleanin kit for like 40 dollars and his shoots alot better than mine. Jus try cleanin it and see how it goes.
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Old 06-27-2009, 02:35 PM
  #7  
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Default RE: Pellet Gun Question?!?

if you were near a building it sounds louder so that could be the problem

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