I've been trying to recall the air volume of my Steyr Hunter Scout Auto-5. I've owned my for at least two years. In fact, I have moved every other air rifle on except my Hunter Auto-5. Lots of good information above.
For the first time since I've owned the rifle the accuracy fell off a bit. I range fishing line down the muzzle and out the breech, tied a couple patches in the middle of the line, and pulled it back and forth with very tiny amount of cleaner. Took 10 minutes (took me longer to find the line). Accuracy was back.
I too would like this rifle (mine is .22) to run a bit more power. I'm right at 900FPS with 15.89 grain JSB and 840 with 18.39. This means FPE is around 29 instead of the advertised 30. I use the grub screw-attached adaptor on the end of the barrel to attach a 4" Hugget Belita. It makes the rifle VERY quiet and I shoot indoors most of the time, to date. Take the moderator off and ouch, probably as loud as .22LR! But, I always shoot with it on. I like the overall length of my rifle, with moderator it is 39". In fact, I've been contemplating some bull pups and with moderator many of those are only 3-4 inches shorter than my Steyr, which keeps me without a bull pup for the time being.
I am having the 5th-shot drop in power at the moment. I've googled and found an excellent, long, detailed thread by another owner about this. It has to do with the magazine being properly indexed. The last shot (#5) may not be properly indexed which means I have to remove the barrel and re-index (I think?)
One last thing. I've found it very difficult to get any type of help in the US for parts (I needed a barrel o-ring, the green one). The USA distributor doesn't seem to have any interest and no, they don't ask where I bought the rifle. I have had some help from Pilkguns in TN but they deal mainly with the target Steyrs. I've actually had a bit of help from the company in Austria with exploded diagrams and parts lists.
I bought both my Hunter Scout and my semi-auto LP50 from Krale. I was pleasantly SHOCKED both times with 1). The hundreds of dollars I saved and the 3-day shipping time. I've never ordered an air rifle here in the US and had it exactly 3 days later. And the shipping cost at $50 is cheaper than most locations here. I wouldn't buy from Krale over the US to save $50-100, but if I can save more than that, I like Krale.
If anyone knows the air volume of the cylinder I'd like to know so I can do some fill calculations.
