UL Guy Line?

We've used monofilament (50 lb) for similar. With your spool, you can get to 60 lbs by doubling it up. The only downside I noticed was if you try to take it off the spool to lighten the weight, it tangles very easily. Do your tent / tarp really need 300 lb?

Not affected by moisture, and it's a pretty good firestarter in a pinch.

Mono gets more line twist than dacron so I think backing would be better for guy lines. Although, for bear-bag hanging, I suppose mono would be better since it would have less friction. Anyway, I'm just thinking about guy lines now. I'll try it out and report back. Just wanted to see if anyone had beaten me to it…

Fishing line is too thin to be nice on trees for bear bagging. It can also cut deep grooves & get stuck.

Pitch that tarp in high winds (40-50+) and that line will be tested very quickly. I think even 20-30 mph winds would break it.

If one were so inclined they go do some good ol' physics/statics calculations and figure out the load that each line would be subject to under varying wind conditions.
I for one have no desire to do so, having just finished up taking those classes last semester, but maybe someone who isn't burned out on it could do it.

Adam

Well, I've been pitching my tarps and rainflys with teflon coated braided nylon for years. 50 yds is UL in the 40lb test size, I don't own a scale but it's probably 1-2ozs.

The catch is I use the kind that is made for ICE Fishing, it does'nt kink up in the cold, or tangle up like mono does. It's cheap at $4.50 US per spool, and you can buy as long a length as you want as the spools come attached to one another in a continuous line way (only line sold this way to my knowledge). You can get it in smaller diameters like 30 lb, but I find the 40 lb the smallest diameter that's easy to tie with cold hands.

I don't use it above treeline, at least I never have; but have used it for years in New England, and other areas without failure. The caveat is I also have some heavier duty Triptease on hand in a 50ft hank if needed to meet conditions. IT IS NOT FOR BEAR BAGGING! ONLY FOR SHELTHER SETUPS PLEASE!

Mason brand 'tip up' comes in forest green.

I have been using the smallest (size 1) spectra line for years with no problems. It has 150 lb test.
You can get 1000' of it at kite builder for $65, that will last forever.

Jason,
If you cushion the line against wind shock with some small shock cord or elastic – something that will protect the tarp as well — you might get away with 30# fishing line. Why not try it?