H4350 powder measure question?

You are an amazing craftsman! In Georgia, the longest public range is 225yds as far as I know.

I have a Pre-64 Winchester 300 H&H. I think it has a gas port that can relieve gas pressure away from your face is needed.
Well where I growth up farms, had field that went for miles. you had to set your own target system and measure out the distances. In Montana there is the same thing.
 
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