Gamo and others accuracy

[stinky]

My daughter is shooting air-rifle in 4H and she needs a better gun. I was looking at the Gamo Delta, which takes 22# of cocking effort and shoots at 525 fps. She won't be able to handle a gun that takes more effort to cock. Anybody know how they shoot.

Most everybody shoots a multi-pump gun (like the Crossman 66) and some pretty good scores are shot w/em. I was also told that it seems like that the fixed bbl guns are more accurate. Thoughts?

[Just a Hunter]

Stinky,

I wanted to start by complimenting you on taking a positive roll in your daughters activities.

OK, Your thinking along the correct lines and realize that a pump gun may vary in accuracy due to how the pressure may vary from the action of pumping.
If you stay with a pump gun it is of the most importance to pump the gun in the same manner each and every time.
To short stroke one of these guns in any manner can vary your pressure which will in turn vary your velocity and accuracy.
A single stroke piston gun takes this variance out of the equation, but there are other things to think on.

A piston gun can have a little more recoil, it may be harder to load and they do weigh a bit more than a pump gun.

I dont have any idea what shooting positions she will be needed to perform from, but I can tell you many of the piston guns can weigh over
7lbs and some as high as 9lbs.

These guns also tend to be a bit louder than the generic pump guns and I would make it a standard that she wears hearing protection.
The hearing protection would not be for protecting her hearing, but instead to help reduce a developed flinch and to increace her accuracy.

I am not a huge fan of Gamo's, but you have to purchase what fits her needs best.

If given a choice I would look at a Beeman or RWS for my own shooting needs, but if Gamo has the rifle that fits your daughter the best I would go with it.

[sharpshooter94]

JAH just summed everything up rather well. You should take his advice.

[Dwayne]

About accuracy of a pump verses piston. . .

Short pumping a pump gun will not affect the accuracy of it at all at the ranges in which these guns are shot. Most of these guns run 500 FPS Simple math says the following.

At 500FPS a pellet will take approx .12 seconds to go 20 yards or 60 feet.
At 450FPS a pellet will take approx .13 seconds to go 20 yards or 60 feet.
at 550FPS a pellet will take approx .11 seconds to go 20 yards or 60 feet.

Now. using Calculus, you can integrate Gravity at 32f/s ^2
Velocity = Intergal of 32 FPS = 32X
Distance = intergal of 32X = 16X^2

Distance Traveled = 16x^2 This is our formula.

WE have our 3 times. . . .12, .13, .11

Using .12 We have a distance of .230
Using .13 We Have a distance of .27
Using .11 We Have a distance of .193

At 60 feet 500pfs your pellet will drop 2.76 inches
At 60 feet 450fps your pellet will drop 3.24 inches
At 60 feet 550fps your pellet will drop 2.31 inches.

What this means, is that your pellet rifle can have a 100 FPS range, and have an range of span by only the mere amount of .93 inches, or approx 9/10's of an inch. (less than 1 inch at 60 feet) you will drop. And this is with a very SLOW pellet rifle. With a faster pellet, the accuracy increases dramatically! That is basically translates to Plus or Minus less than 1/2 of an inch at 60 feet.

Same figures with a 800 FPS gun (750-850)

800 FPS 60 feet = 1.08 inches
750 FPS 60 feet = 1.22 inches
850 FPS 60 feet = .95 inches.

This means your 800 FPS gun can be from 750 to 850 and have a accuracy of Plus or Minus .13 inches or About 1/8 of an inch accuracy. THAT is not very much at all, and THAT is considering a very broad range of velocity. . .a Plus or Minus 5 percent of air volume. and a Plus or Minus 50 FPS accuracy.


You want accuracy???

1. Buy the Pellets to match your gun. Do NOT buy the cheapy's!
2. Buy the Barrel to match your accuracy that you want to achieve!!!!
3. BB's are the MOST (the VERY MOST) inaccurate projectile out of your gun.
4. Pellets are the MOST accurate out of your gun, PERIOD.

Spring load or pneumatic, They are only as accurate as the barrel with one exception. . . Usually Spring loaders are more consistent with velocity, which gives them an inherited advantage over the pneumatic.

Either type is only as accurate as the projectile that is in the barrel.


The faster the projectile the more accurate it is, until it reaches the speed of sound. That means one thing. . .800 FPS are accurate with less than 1/8 of an inch at 60 feet. 1000 FPS rifles are much more accurate at 60 feet.

Dwayne

[LE]

Take a look at the Daisy 853 Avanti. It is built for 10 meter shooting & approved by the 4-H and CMP for competition. Mine will shoot one hole groups at 10m. It is a single pump lever action, has adjustable length of pull by using the included spacers, a Walthrup rifled barrel & good peep sights with various inserts included and a sling. Cost is around $200 from the CMP.

[Just a Hunter]

Daisy 853 Avanti
Weight: 5.50 lbs
Action: Single-pump pneumatic, straight pull-bolt
Sights: Hooded front with interchangeable aperture inserts;micrometer adjustable rear
Safety: Manual crossbolt trigger block with red indicator
Max Muzzle Velocity 510 fps. (155mps)
Muzzle Energy: 4.5 ft. lb. (16.0J)
Overall Length: 38.5 in. (97.8cm)
Caliber :.177 (4.5mm) pellet
Stock/Forearm/Grip: Full-length, sporter-style hardwood with adjustable length
Barrel: Lothar WaltherTM rifled high-grade steel barrel, crowned, 12 lands and grooves, right-hand twist. Precision bore sized for match pellets
Max Shooting Distance: 257 yds. (235m)
Pump Force: 25 lbf. (111.2N)
Capacity: Single shot
Receiver: Diecast with dovetail scope mount
Sling: Adjustable positioning

[stinky]

I don't remember why, but I've drifted away from the Gamo and just about decided on the 953, which is real similar to the 853....but it costs about $100 less.