PH5C sight - how to use it properly?

[newcastle]

I have a PH5C on an old No.4 and i am takign to to the range this week - it's zeroed at 100 yards for an "i" sight picture on a 6 inch black.

My friend just informed me that the 300 yard range willbe open and not the 100 this week. i have never shot at 300 yards before with iron sights, so quite aside from the "will I see the damn target" question. I'm wondering how to adjust elevation correctly. How many clicks / lines should it go up for 300 vs 100 yards?

I am using HXP 303 ammunition so standard 303.

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