Marauder accuracy problems

Try the h&n heavies.alex

If it is still new, send it back. For some reason now and then that happens especially with the 22 cal. Ask Ted at Ted's holdover. Good luck for you with whatever you decide..... Brian 

Here is a resource that may help. https://docs.google.com/document/d/1Jn0RFfnH9YnFaEbT5ynizTnIyJ9DG6u5htJ_65R9P5g/mobilebasic?pli=1 
http://airgunnation.dev/topic/i-would-like-to-extend-an-offer/
http://airgunnation.dev/topic/tuning-the-benjamin-marauder/

If you don't find an answer in any of the above links, feel free to contact me. I can walk you thru a few things and diagnose the issue.

Try http://www.marauderairrifle.com/forum/viewforum.php?f=30&sid=2a9de05855f80d3ed64c08a7d75ff929  When I had a 177 Marauder I spent a lot of time there. My 177 shot well with Benjamin pellets to 30 yards. The 22's have had issues and there are a lot of tweaks on that forum to help you. 

Of all the tweeks and mods I have done to mine (I have over $1000. into it) the Jim Gaska hammer forged barrel http://www.marmotmilitia.com/hammer-forged-barrels.html was the Only thing that solved the poor accuracy. I was just out target shooting yesterday at 32 yards from a bench rest and with JSB 18 gr and JSB 15.89 gr was getting 1/4 to 3/8 groups. The H&N Baracuda Match were very close as well. Interestingly it still doesn't like the JSB monsters. I mean 1 1/2" groups? WTH? Anyway I used to get 3/4" 1" groups at 30 yards and 3" (or more) at 100 yards with the crappy stock barrel.

If after testing for consistency of operation (as AJ suggests) it doesn't improve (assuming you have good shooting technique from a solid bench rest) sell it and get a .25 or replace the cheap stock barrel and save yourself a lot of time and headaches.

Not every .22 barrel is bad and most want to jump to that conclusion instantly. Many have had oversized .22 bores that won't shoot anything well, but not every barrel is bad in .22. I have never actually had a bad crosman .22 barrel as far as my personal guns. I have seen them on customers guns, but steps should be taken to diagnose the problem before jumping to conclusions.

Although I have changed my barrel as well, I would take AJshoots offer and allow him to steer you through the process as to determine what to do. Best to figure out the problem first, before you make changes. He is probably the most knowledgable regarding Crosman rifles on this forum!
Doc

My .22 Marauder rifle shoots the H&N Baracuda Match 21.14 grain 5.53 diameter pellets the best ( stock Crosman barrel ). You may want to give them a try. The JSB 15.89 pellets are right behind them.

FYI- Be aware that if you shoot pellets over 900 fps, it may cause lead to build up inside the barrel, which can deter accuracy.

To try and pinpoint what is causing the inaccuracies with your rifle, you may want to try shooting 3- shots groups, with different pellets. This can help to rule out if the rifle has a "bad tune", scope issues, pellet clipping, loose screws, etc.. If you can acheive acceptable 3- shot groups, then you may want to invest in a chronograph ( if you don't already have access to one ) and try tuning the rifle for a low difference in shot to shot velocities, throughout the entire fill - or shot string ( if needed - you can get help with tuning the rife here at the forum ). If you cannot achieve acceptable 3- shot groups, then I would suggest that you call Crosman ( 1-800-724-7486 ) and see what you can work out with them.

Concerning aftermarket barrels; They may be right for you, just know that along with the higher cost; they may or may not shoot your favorite pellet well, and may also need to be cleaned more often in order to maintain their accuracy.

Once you have decided whether to keep the rifle or send it back to Crosman, do your research so you can decide if the groups and pellets your rifle ultimately is shooting is acceptable enough to suit your shooting style, or if it is bad enough to justify the expense and/or maintenance of a non factory barrel.

Also; make certain the barrel o-ring is in place. This o-ring is located just inside the barrel opening and seals the barrel and bolt together, during the shot cycle. If the o-ring in missing, you will see only see a groove ( see pic )





Care has to be taken not to shoot the rifle with the bolt open, as the o-ring can become dislodged.

Maybe I missed it, but I don't see anywhere where you state that you have thoroughly cleaned the barrel. If not, especially if its a new gun that would be the first thing I would do. New barrels have all kinds of residue in them from the manufacturing process that needs to be cleaned out before you can expect any kind of accuracy. If its used and you haven't cleaned it, there is no way to know when it was last cleaned. Lots of good advice above if that doesn't solve the problem.

If larger head diameters don't help, I would recommend returning the gun if you can. I am unsure of how warranty works in Belgium, but hopefully it is as smooth as it is here in the US.

+1 on the larger diameter pellets. 

How did the pellet look when pushing it all the way out the barrel ? The barrel should be choked.

Maybe post a picture of the pellet after passing it all the way through/out the barrel ?

Pushing all the way through the choke doesn't prove much. When the head shows no marking at all (as were the results of the op) from the bore prior to the choke, you have an oversized bore. If the head doesn't have atleast light markings, it isn't going to shoot very well regardless of the choke.

Did a bunch of testing this past spring on a marauder. It absolutely HATED the JSB pellets. The best pellet was the H&N Field Target 15gr pellets with a close second by the crosman Premier Hollowpoints. Of 4 types of JSB's the smallest group at 5 yards was about 6 inches. The largest was over 2 FEET. But the H&N and Crosman were both under an inch. Velocity was running in the 885-870 fps range. It was interesting to note that I sighted the gun in with the Crosman. When shooting the JSB, the center of the pattern was low and to the right by about 1 foot each direction or more. Glad I had a big piece of cardboard or I would have never found the holes.

Good Luck with yours. I hope you can get a good one.

I really wish Crosman would take there oversized .22 barrel issues seriously!! My current .22 has a stock barrel and is extremely accurate after lapping, polishing, and finding the right pellet. There is evidence that the .22 barrels they use (sure they are from China) can be very accurate, they just need tighter tolerances on bore dimensions!!