Welcome to the forum.
As the other gents suggest, deer are not hard to kill and even light youth loads typically take them just fine. Based on Hodgdon's data and on QuickLOAD, it looks to me like you'll land at somewhere between 63 and 67 grains of IMR 4831 to hit the velocity range you want, the 2800-2900 fps range. Because you will only be filling the space under the bullet to about 80% to 86% with that charge weight range, I would use magnum primers to help provide adequate start pressure and to decrease the powder position sensitivity a bit.
On the plus side, you will only be operating at around 50,000 psi, which should keep throat erosion from being rapid the way it can be with full house loads. So this load will let your barrel last longer.
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