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I am not big on speed but would like to get a happy medium between speed, KE and keep range estimation errors to a minimum. What do you guys think.
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I think you're a wise man.
I haven't checked the charts, but I'm sure you have. I'd suggest going to
www.bowjackson.com and finding out how much that 2215 would weigh, set up like you want it, on his arrow weight calculator. I've found it to be very close. Then, when you get that, you can estimate what kind of speed you'll get. If you know what speed you're getting now with your current arrow weight, you can figure about 4 fps for each 25 grains difference in arrow weight to estimate what the 2215's will do.
Then go into the ballistics table program. If you scroll down, there will be a link to Andrew Middleton's graphing trajectory calculator. Go into that, plug in your numbers and let the program show you what to expect. For a 1-pin setup, set the sight zero to 27 yards. That will show you how much mid-range rise you'll get and how much drop you'll get at 30. You don't want more than 4" on either end for a 1-pin setup.
Obviously you'll be working with estimations and what you actually get could be faster or slower. But it will give you some kind of useful information to help you decide if you want to take the plunge.