7.62mm
Best left to a gunsmith
UTG Shadow ops airsoft sniper rifle (L96 Type 96)
The best caliber rifle is entirely dependent on what game you are hunting. For varmints (small pest animals like gophers, moles, and prairie dogs) as .22 LR would be appropriate. For deer and elk, I would chose one of the .30 caliber options, either 30.06 or .308. For moose, or cape buffalo, I might go up to a .454.
Best left to a trained factory representative.
One you can shoot accurately that meets or exceeds your state's minimum caliber restriction.
There is no one single best caliber, but to get an answer, you need to be a little more specific. Rifle or handgun? Define long distance. 50 yards? 100 yards? 1000 yards?
use hoppes bore snake in 22 caliber best i have ever used
There are several available. The most common are and readily available are made by Gamo and Crosman. But there are over 100 different manufactures. Most are available on the web. Any air rifle that fires above 800 FPS ( feet Per Second) will be sufficient. BUT: here are a few things to remember. Stay away BB guns and rifles or any combination of BB and pellet rifles. They are just not accurate. I suggest a spring powered rifle ( Break Barrel). These will be the most powerful. C02 rifles are fun but are not as powerful as a Springer. Pump rifles are good but you have to pump them 10 times to take a shot. The downside to a springer is you have to cock it every time you take a shot. But it is more effective for taking out varmints. Use hunting pellets, They Mushroom when they hit the target and will make a clean kill. If you can afford it select a .22 caliber air rifle over a .177 caliber rifle. It will have more knock down power than a .177.
There are a lot of calibers that are able to shoot long distances the best rifle in the 30 caliber family are any of the 300's from the weatherby to the winchest er will do a great job on those long range shots
If there is no markings on the firearm, the best and safest way is to take it to a gunsmith and have them pour a chamber cast so that if may be correctly identified.
I use a 2.5-8x36 VX3...