Ive decided to get into bow hunting. I am trying to minimize my cost until i know for sure thatI am going keep bow hunting. I am using my dad's pearson bow that he bought in the late 80's early 90's. I am also using his 31" 2117 alluminum arrows.Itried to buy a few arrows at walmart but could only find 2117 in 30", the only 31" are 2219.Due to the draw length, i want tokeep the 31" length. What difference will the 2219s be compared to the 2117. CouldI shoot both with the same sights andhit good or do i need to stick with one weight.