I made a general statement, you will always have slight differences in your results. A velocity of 850 fps is hardly a hot load but more than target velocity IMO. Most times I consider target velocities for a .38 Special to run from 600 fps to 700 fps. In a .45 Auto it will be different because you have to make sure you generate enough pressure to cycle the slide. I would think 700 fps or so would do that but "might" cause leading but it's not only velocity that will count, pressure is more a factor that's why I mentioned both. If you're using a fast burning powder like Bullseye you will achieve more pressure at lower velocities than with a shower powder so the powder you use also factors into the equation.

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SWCA #3437