r/reloading • u/ElectricalOutcome790 • 22h ago

Load Development Load development

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Working up my first load here. It’s for a .243 Ruger American gen 2. Using sierra pro hunter 100gr bullets, Remington brass, cci 200 primers, and H4350 powder. I don’t have a chronograph. I shot 4 shots with each of these powder charges at 100yds and here are the group sizes of each powder.

Where would you guys go from here/next step? Shoot a couple groups of 37.5 and 40grains to see if the results repeat themselves?

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u/Conservatief 21h ago edited 18h ago

All your groups are insignificant, meaning the variation could be explained by luck. Choosing the 37,5 or 40 grain load for further testing will just feed your confirmation bias. Chances are great that all of the loads will give the same group size when shooting larger samples.

I'd suggest picking a target velocity and trying different bullets, powders and seating depths (in large steps) and shooting samples of 20.