My buddy FITZ tells me he found that he had unexplained lowering of his scores when he took the "un-necessary" coil spring off of his "double spring" offhand rifle. As BrentD mentions, this does work very well (sometimes.) Also, the coil spring seems to be the more durable type... I've never seen a coil spring break in operation, but a flat spring is a constant opportunity for a break, it seems.

I still like the flat spring action better because it is so much easier to disassemble (and more importantly, REassemble!) but in "bench sessions" with the likes of JD, Glenn Fewless, and others, I am slowly being converted to the idea that I ought to change my way of thinking.
Froggie