I read that the 750 Tempilaq shouldn't be used on the outside since it'll burn off on the neck and shoulder before reaching temp if exposed to a direct flame. Have you tried doing a test case with it applied both inside and outside to check that the inside turns color at the same time as the outside?
Of course a lot of old timers say that we're way over thinking this.
I did try the inside but with the method I was using I couldn't see the color change and the templiq didnt evaporate at all, I am also using the 650 templiq
I got that from this article which I pasted the important part.
June, 96 Cases
Another good article I read alot :
http://www.6mmbr.com/annealing.html
"Quick, uniform, consistent application of high heat is the key to good annealing. When the brass around the mouth reaches a temperature of about 660 to 665 degrees Fahrenheit, its surface becomes light blue. This is as hot as you want to let it get. If you let the color run too far toward the other end of the case, you can ruin the head by making it too soft. If you let the color on the neck go beyond light blue, and the shine disappears, you’re on the edge of ruining the case, and you may already have gone too far. If you let the case get red, it’s a goner.
But depending on getting the color just right is too loose and iffy to suit me. I prefer and recommend relying on something more dependable than personal color perception. The most reliable case thermometer I know is a 650 or 660 degree temperature-sensitive crayon called a temp stick. I’ll describe how to use it in a moment.
The hot, small flame of a torch is the only heat source you can rely on to give you the quick, local heat you need for selectively annealing the neck without heat-softening the base. High heat brings the neck and shoulder up to annealing temperature quickly, while the base end is still safely cooler; lower heat lets the base end get too hot while the neck and shoulder are getting just hot enough. Therefore, safe neck annealing takes high heat and a surprisingly short time. "
I must ask. Been following the templiq / annealing conversation but wondering why it's done...and does it need to be done? If so when???
The reason we anneal is to extend the case life, the more you fire brass it gets harder and brittle which will cause it to split and fail, bringing the temp up on just the neck and shoulder will soften the brass up again allowing more life to the case.
In my case the reason I am annealing is that I cut the current neck and shoulder off the case and reformed it to accept a .308 projectile for my new baby. The new neck and shoulder is to hard to withstand more then one firing without softening it back up like the original neck and shoulder was.
I hope I explained it ok the article I posted above gets into it much more and I would recommend reading it.
Note: sorry guys I was a bit tired when I posted this last night I just finished prepping and annealing 500 cases, I have a meet and greet with the local guys on the 23rd and had just received everything to hand load for the .300.
On a good note, after tumbling the brass all night most of the templiq has been taken off, Please let me know how the Hornady's method works out Bill.