First focal plane, that 150 yd shot can be made using the reticle hash marks at any power. The reticle grows as the power goes up and the hash marks are always accurate.
Second focal plane you will have to turn the scope to the power setting the scope hash marks are accurate at (usually max power). This is because the reticle doesn't grow when the power goes up.
Draw back for first focal plane is the reticle gets tiny at lower powers. Draw back for second focal plane is that the hash marks are only accurate at one power setting. Pick your poison.
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“One of the sad signs of our times is that we have demonized those who produce, subsidized those who refuse to produce, and canonized those who complain.”
Thomas Sowell
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