It seems you are talking about annealing in order to avoid overworking your brass, to get more reloads per case. Here the main considerations are to heat sufficiently to anneal the neck/shoulder, but not overdoing it and ending up annealing (softening, weakening) the cartridge base.
Most on this thread who invest in annealing machines speak of annealing with utmost CONSISTENCY in order to minimise neck tension variability, thus achieving greater accuracy.
The M10 gas torch is just fine for the first application, and you can work on doing it the same way for each case. The M10 gas torch is probably marginal for the second application.
The hint above about not going for max loads but for accuracy is spot on. Allows longer case life and more fun shooting. And get a bipod.
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