I installed the 2 lb spring and WOW I can't believe how well this rifle shoots, its a Browning Varmint Stalker in 204, I have some pics of the rifle and a group with the factory spring and a group with the new Timney 2 lb spring.
here is the Rifle

here is the group with factory spring not a real; good pic but you can see the large group
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Now the Timney spring set near 2 lbs
Its hard to belive the diff. at least for me this is a 5 shot group

So I think it was worth it.