A question for those that anneal

[bigbossman]

I just picked up a annealing machine, and was wondering...... for .308, how many seconds in front of the torch is recommended for each case? 6? 7?

[jimmykan]

Depends on how much heat the flame is putting on the case mouth. You know how propane pencil torch flames have an inner and outer flame? I touch the case mouth to the inner flame because it's hotter in there.

When I set up a batch to run, I put some Tempilaq temperature indicating liquid on the case mouths of a few test pieces, and I increase the time-under-flame and/or flame intensity until the Tempilaq indicates the target temperature has been reached. I think my bottle is formulated to change at 650*F, but I think 700*F would be fine too.

https://www.midwayusa.com/product/100735354?pid=171855

[bubbala]

https://www.youtube.com/watch?v=99xKAVKf_TE

watch him flame anneal

[bigbossman]

Depends on how much heat the flame is putting on the case mouth. You know how propane pencil torch flames have an inner and outer flame? I touch the case mouth to the inner flame because it's hotter in there.

When I set up a batch to run, I put some Tempilaq temperature indicating liquid on the case mouths of a few test pieces, and I increase the time-under-flame and/or flame intensity until the Tempilaq indicates the target temperature has been reached. I think my bottle is formulated to change at 650*F, but I think 700*F would be fine too.

https://www.midwayusa.com/product/100735354?pid=171855

Yeah, I have the torch set right, and I'm set the time for 6.5 seconds. I just loaded 40 rounds and the seating tension felt very uniform, so maybe I guessed right.

I accept that Tempilaq would be the right way to do things....... but holy crap, $27/ounce? ouch!

[bigbossman]

...
2b419dfc-b25f-40ee-bc61-70a67e357ba7.jpg

[Fjold]

I have the same machine. Adjust your flame and distance, then dim the lights. When the case drops off, the neck should be a dull red,

[ar15barrels]

Adjust your flame and distance, then dim the lights.
When the case drops off, the neck should be a dull red,

^^^
This is the absolutely best way to do it.