And R17 is a little faster, but so long as you don't run it out on the ragged edge during load development in a cold time period, it should be fine during the summer. R17, can be a touch sensitive to temp swings.
I have the Hornady reloading manual and it recommended that length. As far as the crimp I'm using the RCBS reloading dies.What made you determine your bullet seating depth? Cannelure groove? Just curious.
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