Heavier spring determination

I have 6112s on my truck. After the winch, a light bumper, and skids, my front needs stronger springs. The 6112s came with 600s so I'm told.

Is it as easy as adding up the added weight and picking the spring or is that too much spring. Let's say the winch is 50lbs and the bumper is 50lbs... do you go with a 700lb spring?

Someone suggested a 650, and I'm trying to figure out why.

Thanks

 

I believe I’ve read that for 700lb coils you’d want a minimum of 200-250lbs additional weight on the front end.

 

coil springs are rated per inch. So a 700 lbs spring takes 700 pounds to compress 1 inch. If you want to compress it 2 inches it takes 1400 lbs and so on.
So you can't just add up the weight of your bumper and winch and get that much heavier coil spring because the force required to compress the spring is exponential

 

Got it. thanks. I didn't think it was as easy as that, but I wasn't sure how to figure it. So then it sounds like the 650lb spring would do the trick. (as it's the next heaviest weight offered).