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This link helps to understand the non linear relationship between length and speed https://rifleshooter.com/2014/12/308-winchester-7-62x51mm-nato-barrel-length-versus-velocity-28-to-16-5/ Regarding your Accuracy question, it is barrel dependent and depends on harmonics as stated above. Best of luck
I have spelled it out in basic terms of time and temperature based on metallurgy tables. It really is that simple. AMP is obviously biased because SBA would take a huge part of their market share especially when someone comes out with a pid controller kit. I just did another 100 300rum brass...
If you were trying to cook a steak, without burning the outside, what temp would give more accurate results? A lower heat or a higher heat? It is proven mathematically that brass needs 500c heat for 5-8 seconds on normal neck thicknesses (~.015”) to be properly annealed. It’s that easy. Do what...
How long does it take to anneal at 500c? Here’s a good start. Don’t want to “waste my time” :) http://forum.accurateshooter.com/threads/salt-bath-annealing-amp-study.3979365/
the above table is an annealing table. It lists 425-700c for the proper temp to anneal ammo brass. SBA is usually done at 500c for 5-8 seconds which is plenty to go thru .015” neck thickness, thus annealing it. The AMP article has been debunked many times on other forums. Annealing is not that...
Pot temp fluctuations of even 30deg C are of no concern to the brass since the salt is matching the anneal temp. Compare that to a 3k deg F flame. Quenching is not required for annealing brass according to metallurgy tables Time of quench, +/- 3 seconds, because of the salt temp is also not a...
Interesting. It is much more accurate than torch annealing based on temps of the salt v torch. Sure is easy to overheat brass with a 3k+ degree flame. It takes me 15minutes to heat the pot while I’m prepping the brass and less than 15 minutes to anneal 100 rounds of rum. It does take about a...