I bought the new mossberg 22 tactical rifle . I tried to mount 3 different scops and they all shot off by 8 inches at 25 yards, the incline on the scope rail is at an incline. Is their another rail I can purchase to allow targeting at 25 feet. Thanks

not sure for parts list but the manual is located here http://www.marlinfirearms.com/customersupport/manuals.asp if its a specific part your after try ringing them on U.S. 800-544-8892 they should be able to point you in the right direction

Start buy loosening the scope in the mounts. Loosen the front first to see if it is in a bind (left/right). Tighten it back down but not completely. Loosen the rear looking for some movement or popping sound. If you see a movement or notice some odd thing. check the mounting slots for dirt or dings that may cause an offset to the mount. If all is well. Go and start and zero for 13 - 15 yards. you want to be 1 1/2 inch hi. Now after each shot rap the scope with a screw driver handle or something solid, just to give the scope a shock not hard enough to bend it or dent it but shock it. Large scopes are meant for larger shock than a 22 produces, rapping the scope will help move the cross hairs and settle them in place. Hope this Fixya up. If it does help, please leave a testimonial. Thank you for using Fixya.

Unfortunately air rifles are hard on scopes due to the recoil...Suggest replacing the scope with something more of a brand model , like Bushnell or something like that..

No, this is not a scope issue. The scope is raised above the centerline of the barrel, thus at 10 yards, the barrell is actually slightly raised in relation to the centerline of the scope in order to hit your point of aim. Since the front of the barrel is slightly inclined, at 25 yards the bullet is still rising in relation to the scope alignment. Backing up to 50 yards you will begin to see the bullet start to drop back down, at 100 yards it may drop as much as 8-10 inches, and at 200 yards, it may drop as much as 52 inches. This is assuming that you are shooting a standard velocity .22 long rifle cartridge (1050 feet per second or so).

It sounds good to me, don't forget, the 25-06 is a flat shooting round, you have your scope pointing up, the bullet crosses the line of sight twice, One at 100 yrds, your zero and the other on it's way down at about 500 yards. You can check the ballistic coefficient of that bullet and see where you need to be zeroing it in at. I would think about 250 yards, will be 1 1/2 low at 100 yards, 3/4 inches low at 200 yards, dead on at 250, then it will start coming down, say 8 inches low at 400 and 18 inches low at 500. Something like that. So your BDC will not be needed till you reach out past 300 yards, which is varmint country stuff. I have my .22 marlin sighted in at 100 yards, and it will put the lights out on anything at that range. You can probably find the charts on line someplace, if you don't have a reloading manual. Check it out.

its a bad mount thats doing this,,,you can get over it easly by letting off the rear top mount of the scope (the mount near your eye) and pushing under your scope a strip of 35mm film this will lift the eye end of the scope giving you more range,,(elevation) only put 2 or 3 strips of film under the scope any more that this could bend the scope tube when you tighten it up
but a strip of film is about 25th of an inch and 1th will give you 1/4 of an inch at 100 yds ie:1 click! so you should easly get 10 inches at 100 yds or more with 3 strips of 35mm film under the scope even with bullet drop, the only other way to sort this out is to buy an adjusterbal mount witch is very pricy and 35mm film is cheaper, i do this all the time with my scopes

! click is 1 inch @ 100 yards, provided you have the correct scope for the rifle.
If you are sighting in a .22 LR 40 grain match velocity bullet for 100 yards, the mid range trajectory (50 Yards) is 6" higher. The bullet has a 6" arc half way to your target. If you are sighting in a .270 with 150 grain blunt tail bullets for 250 yards, the mid range trajectory is .4 higher. It only has 4/10" arc half way.
You most match the scope to the gun, and the 1 click= 1 inch rule will apply. Otherwise, it's lock it into a righd mount, fire it and adjust the scope accordingly. If you want to change the range on the scope, it will be guesswork.
I use a Bushnell Banner 3-9X40 with BDC. If you have BDC, make sure you have the correct distance ring in for the caliber.. It will make all the difference in the world.

Mount the rifle with the scope and make a mark on the backstop right where the crosshairs are pointed at

Shoot several times, several shots will surley jolt the scope some.

If the crosshairs have moved much past your mark then this would indicate the scope is the issue.

If the crosshairs are still pretty well centered to the mark, its not the scope.

If at the same time your grouping looks terrible, and your scope still is on the mark, and the gun is WELL mounted, then the issue is with the accuracy of the rifle.
Make sure the rifle is mounted good for this to ba accurate .
Hope this helps

Sounds like you want to "re-sight" in your rifle. Make sure mounts are okay and tight. Look down barrel and then thru scope and eyeball windage and elevation adjustments so the scope seems to be fairly in line.

Clean barrel if it needs it.

For basic sight in, start at 25 yards with a large(3 to 4 feet) cardboard or wood backdrop around target (bullseye). Fire at target. Once done, look through scope and position rifle such that the shot mark you created is dead zero. Hold rifle very steady and you or buddy move windage and elevation adjustments until scope moves dead zero back toward original target (bullseye). Fine tune from there. Air cool rifle between rounds. Once dead eye, fire another round or two to check grouping. Check your ballistics (sometimes on ammo box) to see how height at 25 yards affects your desired dead on target (100 yards, 150 yards, 250 yards etc.). Adjust accordingly. Example: you may need to sight in at an inch high at 25 yards, depending on your dead on target distance..

Always remove sling from barrel when sighting in.

Try to sight in at similar temperature as you intended shooting temperatures, if possible.

If not black powder, avoid cleaning barrel between sight in and hunt/competition unless you note bad buildup inside.

If you change ammo, understand that that may affect performance. Once a preferred ammo is found, some even try to buy a decent quantity with the same lot number on the boxes if storage allows for such.

Ja, it's 1/4 M.O.A, so at 25 yards/meter it'll be ca 3 inches. You may have gone in the wrong direction. That is, if it was 3' high, and you went another 3 higher then you'd be at the top of the paper. Probably you've got it figured out by now.

The easiest, fastest, cheapest way to zero is with a rifle rest you can clamp your scope into, or alternatively somehow immobilize your rifle some other way. You take a shot, at 25 yards or so. It makes a hole. You now immobilize the rifle, via your rest or heavy sandbags, with the scope pointing exactly where you aimed before. You now, carefully and without moving the rifle/scope off of the point of aim, dial your reticle to point at the actual bullet hole. Your next shot will be at your point of aim now. So you just put it at the right height above your point of aim at 100 yards now.