Originally Posted by WSU
Has anybody ever killed Bigg(er) animals like a hog, or deer size with a sub sonic rifle round? What cartridges would best fit this situation? And finaly, in regards to the repot of the gun and sub sonic noise. Once your round reaches the speed of sound you get noise. So, will a round breaking the barrier by 50 fps be any more quiet than one cruising 1000 fps faster? In my mind I'm thinking something like a bolt action .308?
Don't be fooled by the hype. You get noise, just less of it even with Sub's and a suppressor. You just won't get a loud sharp crack, more of a hollow "thump" or "thud". If you are willing to spend enough you can even get one effective enough to make the sub sonics sound more like just a big "whiff" but those cans carry a very high price tag.
Such a rig seriously limits your killing power so short range is going to be the rule.
Now you can where legal get a suppressor that will work very well at noise reduction with any caliber, even the 50bmg which does not then give you the same limitations.
If you want to go the sub sonic route then the .30 whisper would be one to look at. Combined with a suppressor it's very quiet and still can deliver enough energy on target to be effective on deer at a hundred yards or so.
You also need to check your state's game laws as suppressors are not legal in all states for hunting.
There are some very effective means by which you can mask/reduce the sound signature and flash without the use of a suppressor which are perfectly legal anywhere but they require a little creativity and are not at all easily portable such as an insulation lined culvert or barrel which works great with smaller calibers for prone shooting on a range or big field. Thes work essentially as just big expansion chambers and contain most of the blast within. You just need a hole on each end large enough to sight and shoot through.
Price and portability along with your local and state laws are the major factors which come into play.