In hunting with spring-piston air rifles, I carry mine "locked and loaded" for as long as it takes for a shot to present itself, however long that is.
I've always done it that way, and my experience with respect to hunting with air rifles predates the introduction of the R-1 by a couple of years or so, so I've been doing it that way a long time.
Some would say that I am doing it wrong, too.
However, I do most of my hunting in dry, dusty California High Desert. With all of the dust and grit that my rifles get subjected to, they usually don't go more than two seasons without tear-down for cleaning, anyhow. While I've got one apart, it ain't that big of a deal to put it back together with a new mainspring and piston seal. Those parts hardly cost the moon, so it doesn't hit my wallet too hard doing it that way.
I've always tended to look at the mainspring and piston seal as "wear items" that I am going to replace at some point, because at some point, I know that I'll be replacing them or having some else do it for me.
Also, the nature of the game that I hunt -which is primairly upland game birds like valley quail, Gambel's quail, and chukar, is such that the rifle really needs to be cocked and locked in order for me to capatalize on the moment when game is spotted. And the economics work out for me because whatever I spend on pellets or rifle upkeep during the course of the year is a fraction of what I spend in gasoline driving all over California during the hunting season. When I am burning sixty to a hundred bucks worth of gas and walking 3 or 4 miles just to be in a position to shoot, I want to be able to simply flick the safety off and shoot.
And from the thrid Saturday in October to the end of January, I am out hunting almost every weekend. That's a lot of sixty to one-hundred dollar fill-ups. For me, the cost in parts and time to swap mainsprings and seals isn't very significant in the grand scheme of things.
But it could be for others, so ultimately, whether to keep it cocked and locked or only cock once game is sighted remains an individual thing.
If you do it my way, you most likely WILL be shortening the life of your mainspring.
-JP
http://www.uplandhunter.net