Rifle details?
Barrel length, twist rate, contour, stock, weight, what type of scope you have on, etc?
Best consider all these factors when developing a load, a light rifle with a heavy load (many of the sugguestions above are) will not be fun to shoot over extended periods, meaning harder to gather dope and drift data.
Why develop an absolute banger of a 500m load if 90% of your shots are 0-150m? Two different pills could be a better choice.
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