Originally Posted by
chrisward3
I prefer first focal plane as it is the most versatile when shooting field courses where you need to range targets, measure things, and spot corrections since the reticle remains calibrated at any zoom length. One trade off is that the reticle will increase or decrease in size as you zoom in and out.
Second seems to be more suited to fixed distance shooting where you know the target sizes and can rely on one focal length.
That's my 2 cents on it based on my needs. I shoot with the h59 reticle which is all about meausring and hold overs, so ffp is a must.