It all depends on the power source but PCP (PreCharged Pneumatic ) air rifles will give you the furthest range depending on the shape and weight of the pellet. Light pellets will travel further and heaver pellets have more knock down power and will fly straighter.
.177 is the more common calibre, so if availability is an issue, that may be something to take into consideration.
I would contact Hatsan directly. See the link below.
As long as the pellet is .177 Cal then any .177 caliber pellet will work in your .177 Gamo.
An air rifle could be made in that calibre. Benjamin made a model 242 and 247 in .177 and .22 calber from 1968-92 but not a model 243.
No. a 177 is a 4.5mm pellet. A 5mm is a 20 cal pellet. A 5.5mm is a 22 cal pellet Don't try it in the wrong airgun.
Use a .177 cleaning rod and push the pellet back out of the loading port.
Any air gun or rifle that uses a .177 Caliber pellet can use the Gamo .177 Red Fire Pellet. No matter who makes the air gun. The Caliber .177 is universal to all .177 caliber pellet guns or rifles.
The best for what? Paintball, .177 Pellet, 6 mm pellet or bb rifle?
175m/sec with 0.45gram pellet.
Simple: With the Safety On. Slide a cleaning rod down the barrel to dislodge the pellet from the loading port. Yes there are cleaning rods for pellet guns. They are 177 caliber.
mod 55s is in .177 calibre and mod 60s is in .22 calibre apart from this they are the same rifle, it is also available in .25 calibre but not sure of the model number.
With the right pellet you you can, But it should be a hunting Pellet (Hollow-point) and it should be a heavy pellet not a light weight pellet with at least 900 to1000 FPS.