I use the LP.............
on the 40X for varmints. The 'wire type' referred to, uses a curved piece of aluminum rod, maybe 1/8" or so in diameter, and it can be set for ounces; since I don't have a gauge in ounces, I don't know how heavy or how light it'll go, or how heavy mine is.
I DO know I've had NO problems w/it since I got it in '83 and I shoot it numerous times every year.
That said, however, there are a few sensible things to remember. When you clean the rifle, store it w/the muzzle in a cup, or cap, MUZZLE DOWN;
This will keep gunk out of your bedding area, and out of the trigger, too. Too many people use something like Hoppe's No.9 as a lube & preservative over the winter months. Hoppe's is a SOLVENT but it has additives in it that turn to varnish w/age (a winter's worth is enough time). If, after a winter you encounter, upon closing the bolt, that it 'follows down', that is the culprit, and a spray w/non-chlorinated non-ammoniated brake cleaner (BRA-KLEEN in the green can) will alleviate the problem. Remove the barreled action from the stock first.
The LP (Light Pull) has NO SAFETY, and as such requires you to use a dime on the left side of the bolt when its withdrawn, then gently roll it forward between the bolt and receiver wall to remove the bolt. I know this sounds clumsy, but its easier done than said, and you'll quickly get the hang of it.
the other light pull referred to by another poster was actually the single SET trigger, and yes, it does add lock-time. The LP is the same three-lever trigger, it just has the heavy shoe and "Kicker" removed, to keep it from going off accidently. I was able to successfully train myself, from a hunting stand, to load and shoot the trigger w/ski gloves on. Its just a matter of technique, but the muzzle is always in a safe direction, and I'm usually alone.
Some have tried my trigger and said it feels like 2-4 ounces, I don't know; but I DO know I really like it.
Oh yes, the aluminum 'trigger' is adjustable fore and aft and side to side by loosening an allen screw underneath, and I've adjusted mine to a position just to the right of the centerline of the trigger guard, as its just a bit comfier that way, for me.
I also cryoed mine as I have for all my triggers and bolts, as it negates the possibility of "follow down'' on below-zero stands in the winter.
Hope this gives you food for thought, and if you don't want to buy it, let me know.