Load Development

I've been reading up on OCW loading and they typically will load 3 at each weight and shoot at separate targets to find the OCW.

I saw some people trying it by just skipping shooting at paper and just shooting through a chrono and plotting the numbers to look for a flat spot. Has anyone had good luck with this or do you recommend sticking to group size on paper?

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I use both, the chrono to make sure I make power factor (with a 5 PF cushion) then I load up until I get the group and gun movement that I want.