GTA
General Discussion To Gateway To Airguns => Gamo Gate => : RoadKing September 29, 2009, 03:57:59 AM
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I have a .177 Whisper that has been tuned and have a GRT-III trigger installed. My scope is the stock one that came with the gun installed on a varmit hunter base. (I like the fact that it has a laser/light for night hunting) I have purchased a pellet sampler pack from straight shooters and found that Beeman H&N match 7.55grain and Predator Polymags 8.0 grain seem to be my guns favorite food. I will get the scope sighted in to a pretty tight group @ 20 yards, but if I let the gun sit for a period of time my grouping goes way off and I must repeat the sighting in process. I don't think my scope is moving or is loose. Is this normal? Can a gun get "warmed up" and perform differently when cold? I would guess that I have close to 1000-1200 assorted pellets through it and never over 9.5 grain. I am looking for my gun to be consistent, have a good grouping and be that way when I take it out of the gun case when a tree rat presents itself. Do I need to continue my quest for the "perfect pellet" or am I doing something wrong? Would an "Accushot" one piece base and different scope help? If so, I would like to hear some recommendations. I shoot prone with a bi-pod from a very stable platform. I try and be consistent with my grip, eye/cheek position and breathing from shot to shot. :0
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Hello Jim,
There are a few thing that you can take a look at !
First and always check to see that your stock screws are tight, very snug, not very,very tight !
Then check the scope and mounts. Take a pencil and mark the front and back or the rings that hold the scope, then mark the mounts were they connect to the mounting rails, this will show you if the scope or mounts are moving. From longislandhunter !
Then, check to see if you front muzzle break is loose, or if you have any gray streaks contacting the break.
Finally for me, You didn't say who did your tune ? If Bob or Gene did your tune I wouldn't mention this, but some people that tune air guns, shouldn't ! and your seal may damaged ! Or you may have questionable parts installed.
I hope this helps you out ! If not let us know !
Bill
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Could it be the moderator? Pellets touching the baffles I mean. If for some reason the moderator "lives" during the storage and gets off the barrel line.
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Had the same problem today with my Crosman 800X, - BOTH stock screws were loose. ... Any problem with using Loctite I wonder?
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John,
If I were to use Loctite, I would only use the removable "BLUE" Loctite, and use the least amount possible.
Bill
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Thx, - Bill, sounds like a good idea.
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Sometimes it is us that needs to get warmed up! I'm serious the first few shots I take everyday seem to always be off. Then I get into a groove and it is fine.
I dunno about getting warmed up, but it matters with tank guns on how warm the barrel is, the ambient temperature, even the temperature of the ammo!
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I agree completely, - I like/have to see where the first two or three hit to be comfortable. When shooting my .22 powder burner, I always go through one clip to warm up the gun, and see if a tweak of the scope might be a good idea. ... Lately for some reason, I've been using my wrist to help my finger pull the trigger, only with an air gun though, not a powder burner - frustrating as all h*ll. ... The "extra help" almost NEVER helps, - pulls everything to the right.
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A couple of things I've learned from shooting my POC Air Hawk.
1) Always use either an open hand or your forearm for your left hand.
2) Hold the right hand firm, but don't crush it.
3) The thing that has helped me a lot is to watch your cheek pressure. Don't lay your head on the stock. At best it should barely touch. I think the reason why is the gun moves back and then hits your cheek causing it to pitch to one side. I'm not certain of this, but it really helps.
4) Work on your trigger pulls. You can easily pull a gun one way or the other with your trigger. Concentrate on squeezing not yanking and put your finger in the same place every time.
When I was out in Kansas trying to shoot Prairie dogs, I'd just put the gun in the car and go. However it always worked better to shoot the gun before going in the field just to confirm your zero.
I just went back and noticed you shoot from a BiPod. That may be your issue. Have you tried shooting it from say a table while sitting? My Whisper can pretty much put every pellet in a small group at 20 yards. I'd try some different things to see how this one shoots. I'm not convinced that every gun is the same and they all have their foibles.
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Been having the same problem with my Quest 800X ... scope and screws are fine, but there are a few "gray streaks" in the muzzle break , a Beeman - but it's tight. (It's definitely tight now) ... Brake off center possible, - or something else???
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Hy,I've got the same problem with either my .22 Whisper and the .177 Shadow sport.Both were tuned(by me) and deadly accurate one day :D ,the next I had to rezeroing the scope :( (as gremlins would secretly move it!!!),I've searched here and there and find out that most of the problems are related with Gamo's scopes (at least the ones originally fitted) so I changed the scope with 2 Leupolds and since then I had not a single problem anymore.
Hope this may help you.
Emi.
PS:My 2 rifles are both synthetic,later I've filled the empty stock with rags and it went even better. 8)
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I just put on a new Leupold scope on last week, - no change. BTW, I never had a problem with my Whisper, installed a GRT-III trigger and it's a tack driver. ... Giving this some though, I might have the problem solved. I've installed this Beeman brake on two .17 cal rifles, with good results - the 800X is a .22 cal. ..."Maybe" this brake is a tad too small for the 800X, - some shots are right on, and the next 2-4 are anywhere from 1"-4" off. I may not qualify for the Olympics, but I'm not that bad, - well, not consistently. .... "Might" be a good idea to take this to a local machine shop and have them increase the dia about .050, - try to keep the pellet/brake opening relationship constant.
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You hit the nail on the proverbial head here, - I have been putting to much "cheek" pressure on the stock. That plus I think I have a "muzzle brake" problem - hopefully solved.
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You can just drill it yourself. Here's some sizing information http://guns.connect.fi/gow/QA1.html
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Thanks rkr, - too late I guess, I just dropped the brake off at a local shop, it will be ready tomorrow morning - $20.00.
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RoadKing, - I hope you've that problem squared away, - good luck. ... As posted, I had the muzzle brake "opened up" .040-050, - BINGO! problem solved. I just returned from the range, NO comparison, tight groups at both 25 & 50 yards. Anything that wasn't close, - probably had something to do with the guy hanging onto the rifle. ;)
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I replaced the original Gamo scope, and gave up the light and laser(pretty cheesy anyway) I went with a weaver base and a Leapers scope. Still attempting to "dial" the gun in. As far as "brakes" go, my Whisper has a fixed break (I think) Is there anything that I could and or should do to it? Also I took off the stock to replace the scope mount(s) and noticed that I am missing a small "C" clip on a part of the trigger assembly. Currently I am using safety wire to hold it in place. Where can I get another "C" clip for the pin? I sincerely appreciate all of the fine advice on this forum. I was using way to much cheek pressure on the stock. Once I adjusted my death grip, my grouping started looking better. Still 4-6 out of 10 shots are random even after the scope change. I am using Beeman Hi-speed 7.6 grn H&N Match and Polymag Predators. If I pump anymore money into this gun my wife is going to use me for target practice!!!!! :o :o
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Two things, - that missing "C" clip on the trigger assembly is fairly common I'm told, - I had one missing too on a new Phantom. I would STRONGLY suggest one of your accuracy problems is with the factory trigger on the Whisper - waaay too much travel. You have to kinda guess when it will fire, and it's not always at the same point. Which makes things even worse. ... For $32.00 buy a GRT-III trigger from Bob, - you won't believe the difference in that gun. Your accuracy will improve 100% - and your wife WILL survive quite well,even if she doesn't think so - honest. ... Installing the GRT_III is a piece of cake, - you won't have a problem. - I doubt there's anything very practical you can do with the Whisper's barrel, - it should be ok as is, isn't that one of the reasons you bought it to begin with??? ... Good luck and let us know how things turn out, ... (BTW - if you really want to get a second "C" ring, - take the one you have off - and go to a hardware store, they should have a match)
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You can get the little C from Home Depot.
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Go for the GRTIII trigger. It transforms a budget air rifle into performing like a quality $500 gun. It is easy to install. Provide that there are no further undiagosed problems, using the correct springer shooting technique, you can achieve 5mm c-t-c groups at 30 metres. We find that using JSB Exact 8.44 4.53mm pellets gives optimum accuracy.
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I have two Shadow 1000 NRA's. The first one was returned to gamo and they replaced the scope. Everything was tight, but it would pattern rather than group. UPon return, the accuracy is what I expected. Now, I'm going for the trigger and gas ram.
It could be the scope... Check it out.
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Hi Jim, welcome to the forum. I know it has been said not to use anything heavier than a 9g pellet. But I have found all my .177's that are claimed to do 1000fps do much better with the Crosman Premier 10.5g.. Yes, it does slow it down, but the trade off is more fpe.. They work very well for me and I have not broken a spring to yet. Have a great day and good luck - Lee
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What N_strike said. I changed scopes and got rid of this problem. I got Bushnell 3-9 for hunting and it has worked very good. Just bought another one for my other gun..$57.00 at Wally world.
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Thanks for the info Lee! I am really glad to have found this site. So much knowledge to tap into! I have read that it is not recommended to go higher than a 9g pellet in a .177. Is it the seal that can't take the weight or spring, or both?
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Hello Jim, after you've tried checking for loose stock screws and possibly replacing your scope you might try to remove your bi-pod and just shoot with what's refered to as the artillery hold. Bi-pods can be a hinderence to consistent grouping especially if it's mounted to the barrel via a barrel band. Anything touching the barrel is usually a no-no in a springer.So much of these type issues are trial and error and more trial so keep shooting.It's not all that unusual for certain brands of air rifles to need a few warm up shots before they get in a groove. Good luck.
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Hi Jim, although going over 9g is recommended by some, of all the different .177's I own and shoot frequently, I've never broken a spring by shooting 10.5's. I'm not saying to ignore the warning, I'm just saying I've never had a problem. Going from 9g to 10.5g is not that much of a stretch. I can't say as I've ever gone over 10.5g so I can't vouch for that, but the 10.5g has certainly improved my groups. Also, if you hang out here much, you'll be changing out your own springs anyways!! Have a great day - Lee