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Typically when there is a discrepancy between manuals, I go with the lower number. It is always safe to be safer. Start low and work up watching for pressure signs. They will be a little harder to see in a semi-auto, but with some close attention you should be able to see it.
Don't be so quick to jump up in 1 Gr. increments. Think more along the lines of .5 gr. and if you notice the group close up then open back up odds are you've passed the sweet spot. Take the 2 tightest groups and start at the lower grained load and work up in .1 or .2 gr. increments.
One other thing you may want to watch for is the max length in your mag. I loaded some test rounds for my DPMS yesterday and was within .100 of an inch from being longer than my mag.
Welcome to TFL. Hope you stick around and we can learn more together.
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