What are the main differences between bench rest and hunting air guns?

In a nutshell and excluding those that have their barrel and action mounted onto a rail, typical benchrest rifles are heavy. They also are designed without the idea of "the shooter holding the gun" to eliminate as much human input as possible, which usually makes them uncomfortable to hold and handle in hunting conditions. Hunting rifles, in general, are designed to be more ergonomic and comfortable for the shooter when out in the field. Usually, benchrest rifles have a flat base at the fore-end of the stock so that its surface sits evenly on the rest surface, which supposedly aids in balancing it and makes it more able to recoil straight back. They also have a thicker barrel that has been chambered for a particular round, ultra-light and crisp trigger, (some have) recoil dampeners or stabilizers, and most of them have been blueprinted. Some of the other "trick" stuff have been incorporated by the shooter himself/herself. Basically, the purpose/design of a benchrest rifle is for a rifle that shoots with precision with as little human contact as possible. 

Can a benchrest rifle outperform a hunting rifle with respect to accuracy? Nope! A shooter with great skill who knows his/her hunting rifle well can easily shoot just as precisely as an expert benchrest shooter can. And let me just say that I have seen shooters with fully tricked-out and regal benchrest guns that simply can't shoot worth a darn or what the gun is worth even when it is already sitting on the table, perfectly set up and pointing directly at the target/point-of-aim requiring the owner to only pull the trigger. That should tell you that it's mainly the shooter's skill level that determines the difference between a professional shooter and a "professional poser."
 
"azuaro"Daxx:

Calibers, power levels, accuracy, maybe or maybe not weight &.bulkiness and definitely price.

It also depends on what type of Benchrest shooting you are talking about....,If you mean HV and LV shot at 25 yards with USBR regulations, the main differences are the calibers allowed which in BR are limited to up to .22 caliber, consistency and accuracy of the gun (if you want to be competitive) which in turn are reflected by much higher prices...These guns may or may nor be bulkier/heavier than hunting guns but will definitely be much more precise at BR distances and more expensive.

If you are talking about extreme benchrest, then the same stated above applies but with plenty of room for top of the line hunting guns as they are usually accurate, but very powerful which is mandatory at the 75-100 meter and more distances shot...Here ordinary BR guns meant for 25 yard shooting fall somewhat light in power levels.

BR guns (per se) are shot is 3 basic categories: 12 ft./lb, for LV, 20 ft./lb.for HV and unrestricted power for the unlimited/open class...Most serious BR shooters only shoot LV and HV, and use .177 or .22 calibers, so top of the line dedicated BR guns fall a little short for the current trend in ultra powerful hunting guns.
Note: 20 cal BR guns are not very popular because of the limited pellet availability.

Now, keep in mind that all this said applies to the US and other countries where more that 12 ft./lb. are not a problem....In The UK and many other countries, 12 ft./lb. is the maximum power allowed for any kind of airgun, so BR and hunting are shot at the same power level.

Cay you make a hunting gun shoot as precise and consistent as a BR gun?...In my opinion yes you can, but this takes much knowledge, patience, modifications and $$$... I believe that by the time you add up all that is required, you usually are much better off buying a dedicated BR gun.

Regards,

AZ
You are allowed more powerful air guns in the UK (and most other places with restrictions) if you have a firearms license. It's just like how hand guns are here. People with a serious interest in shooting there will likely apply for a license. Many air gun stores there offer both power options. 

I would add balance as difference with a pure bench rest gun. I would want a bench rest gun to have more weight up front for stability when shooting from a rest or bipod. I would want center balance for a hunting rifle. 

There are some guns which can be used for both. 

With air guns they also have the pro line of target shooters which tend to be far less powerful but more precise. I want to try one of those $4000 600fps target guns just out of curiosity some day.