Well it seems as if we have moved this thread to suppressor usage!
I think the use of suppressors for hunting is in large part a terrain and culture issue. In the UK and Europe a lot of our hunting is on much smaller areas of ground, very often you may have private homes, farms, horses or cattle around within less than a mile or even several hundred yards! We also want to be much more discrete with our sport and not draw attention to ourselves. Whilst hunting may have long traditions, it is typically not a sport of the masses. Hunting is all typically on private ground, landowner permission is required and is easier to be obtained if you are reducing noise.
Most of our US shooting is in much more wide open spaces where noise is never such an issue.
The availability and cost of suppressors are very different to the US, a nice .22 suppressor costs around $100 and a top quality .30 cal suppressor is about $400 in the UK, having purchased similar products in Michigan and having to pay the tax stamp the comparable costs are $500+ and $1,000+.
In the UK and Europe you are already dealing with the police for gun ownership, it is easy to deal with them about suppressors and ownership is encouraged and expected with hunting rifles. In the US suppressor ownership has not been encouraged and you need to jump through a few expensive hoops to own a suppressor.
In the UK there is no hunting by any form of tag or permit that limits the number of deer to be shot, a lot of my deer hunting was involving deer culling, a suppressor makes this task a little easier by reducing the muzzle blast noise, the deer don't run quite as far or hard, we would often shoot 4 or more deer out of a group in several seconds. In the US you tend to typically shoot one animal at a time in a limited season, In the UK we just about shoot deer all year round, there are different seasons for male and female deer shooting.
In the UK we do a lot of night shooting for rabbit and fox, again this can often involve small areas of land near homes and farms, in all cases this type of shooting is done with a suppressor, which allows this to go on with a little discretion.
In Michigan I hunt my 350 acres of northern woodland with crossbow and rifle, few of my neighbors believe in shooting whitetail does, we are over run with deer, the crossbow does a nice quiet job but during our main 2 weeks of gun season and during our later extended gun season for does, I find adding a suppressor can often lead to multiple deer encounters during a morning or afternoon. We are pretty much on unlimited doe permits now.
While I'm very pro suppressor and come from a long history of hunting with them, I'm not putting a suppressor on my rifle for an out West Elk Hunt, a Scotland red stag hunt or my upcoming trip to South Africa because they are not situations where a suppressor provides any great pay back and I have to lug it around on the end of the rife.
Most suppressors in the UK and Europe are what I call 50% over the barrel, if it is 8" long it will only add 4" to your overall gun length. This design does not seem to be the main design for US suppressors, we should adopt this type of design to balance out the weight and cut down on suppressed gun length.
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Still I would like to see Blaser sell their barrels pre threaded in the US as they do in other places and let the users decide on muzzle break or suppressor usage. Many lower cost volume gun manufacturers are included a threaded barrel as standard in the US these days. I predict that hunting with suppressors will gain some more popularity for serious hunters in the US as time moves on. I certainly appreciate it will never be a standard for most of the shooting population.