I'm looking for a "economical" large survival/wilderness fixed blade knife for my bug out kit. I do not have much experience in using large blades in the wilderness. my largest blade now is a 6" cold steel SRK.
Unless your CS SRK is broken, the truth is that you could probably survive just fine with it.
Much of the answers you are looking for depend on your 'theory' of survival and 'bugging out'. Many will tell you that they can do anything they have ever needed with a little trapper pattern folder. Others will tell you that they are unwilling to go outside without 3 fixed blade SURVIVAL knives.
Really, there is no one answer, and the journey, including buying a knife or ten until you find what you really prefer, is the answer.
The cold steel Trailmaster has been recommended by a friend as a "bet your life" large blade but it's feels too "big" to carry around
The Trailmaster is really not that big. It just depends on which end you are comparing it to..... If you compare it to nail clippers, then it is a sword, but if you compare it to a sword or a machete, then it is small....
A proper carrying system will go all the way to making a knife that size carry well.
Unless you are speaking about the way you feel in response to the way you think people are thinking about you, in which case only long experience or therapy will help.
and an expensive blade sitting in storage seams wasteful
But, you said that this was for a bug out bag, in which case, the greater risk would be not having the appropriate tool for the job when the whole enchilada is on the line.
Like carrying a firearm daily, is seems ridiculous, logically, until you consider how stupid you will feel if you need it, and don't have it.... At which point, it starts to feel pretty good.
I live near the ocean so storing a carbon blade in a leather sheath is not good.
Corrosion (rust and staining) is a fact, and the sooner you get past that, the sooner you will be able to truly your knives. But proper care will go a long way to keeping corrosion to a minimum, regardless of your climate.
I saw video recomendations for 7" blades a a minimum wilderness knife size knife, like the Ka bar Short heavy bowie, RAT 7 and cold steel recon scout. anyone have experience or recommendations?
Not the briar patch, not the briar patch.....
Short answer, the RAT Cutlery RAT 7 is a good knife, from good guys, who have went and done that.... That model has essentially no compromises, which cannot be said about the other two.
The long answer is.....
I would suggest you do some reading in the Wilderness Skills and Survival sub-forum, and maybe re-post there, with some more information....
http://www.bladeforums.com/forums/forumdisplay.php?f=692