You don't need a shread of scentlok, or any other type of scent killer clothing. What you need to do is learn how and where to set up before calling so that the coyote can't smell, or your tracks walking in,you before you kill it! You might be able to fool a deer with scentlok, BUT a coyotes ability to smell is a heck of a lot better than a deers ability.
About any distress call will call a coyote. Learning to make just any distress call do just that, you need to have an idea of what it should sound like. Get a predator calling video and watch and listen to how it's done. It's not rocket science, BUT if you don't come close to sounding distressed, you won't call much in.
Wear good camo, to match your surroundings. The 22-250 is a great choice for killin' coyotes, although your .270 will do fine until then!
If you call them in at night and use a light, simply don't shine it directly at them, instead keep them in the hallow of the light. All you're looking to see are the reflective eyes. Make sure you can positively identify your target at night, as many different critters may respond! Night callingwill be more productive, BUT once it gets really cold, calling them in during any time of day will work! A shotgun, with 4 buck,might be better for night hunting!
Get into your calling area quietly and unseen. Don't talk, don't slam car doors, etc. Sit and calloff and on for at least 15 minutes. Be prepared from the very beginning to the very end for incomers. Don't get caught moving.Coyoteswon't stand around long after they see any movement, and if they smell you, they will run away about as fast as if theywere shot at!