Do your load(s).
Set up at 25 yards to make sure your touching paper. Adjust to centre, out to 50 and repeat, out to 100 and repeat. Now dial in your pet load that your figure gives you the best grouping. Make sure rifle is rested and attempt to maintain the same sight picture...hard to do with open sights but that's all part of the fun.
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Be careful when you follow the masses, sometimes the "M" is silent... 
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