If you have a rangefinder or binos with built in ballistic data you don't need a phone or piece of paper on your stock. The rangefinder gives you a range and then shows what moa to dial. Dial that into your scope. Job done. Very hard to muck up.
The great thing with this system is that you can also have more then one set of data for each rifle. I have one load for long range deer and one for goats. With a cds you are fixed with one load. All I need to do is change which curve I'm using using my phone and then it is stored. Can be easily changed during a hunt if need be
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