i agree with a lot of the responses here, but, i think if you do practice, and you are a veteran bowhunter longer shots can be made. the shots i am talking about are 35 up to 50 yards. some folks think they can take longer shots at elk and mule deer "because" they are bigger animals. i dont like that logic. they may not be able to react to the arrow as fast, making shot placement less critical, due to a slower reaction time.
i have taken several deer past 35 yards, and would not hesitate to take a shot at deer out to 45 yards that are calm. i find that the further the deer from me, the less likely it is to react to the sound of the bow. i dont care how much string silencers and tricks you use, a deer can hear your bow. it may be quiet to you, but probably sounds like two frying pans to a deer.
speed is not as important as accuracy. i take a bow capable of shooting extremely fast, martin fury, 325+ and shoot a heavy arrow at 270. less vibration, less noise, and plenty of K E to finish the job. shoot the most forgiving hunting rig you can assemble, fashion and fad mean nothing to deer, and shoot it as much as you can. participate in club 3d events, and you will find your ability will increase drastically in a short period of time.
bottom line is, shoot what you are comfortable shooting. dont let pride get in the way of good judgement. practice yardage estimation equal to bow practice. you cannot hit it if you do not know how far it is. good luck to you.