Don't get practice arrows, get the arrow you want to shoot. Spine matters, but … with different point weights , or changing the side plate thickness , or both you can usually make a good combination in a spine up or down one size.
Measure your draw on the trad bow, don't go by your compound draw length. It will be shorter on the trad. Draw to the corner of the mouth, not your ear., you are not trying to see how far you can pull back, you are looking to see how far a good draw, arm slightly bent , corner of mouth actually is.
50 @ 29 is unusual, it must be a custom made , or a typo , but in any case drop 2# for every inch you draw below the 29" marking, or 28" marking, what ever it is.
This will put you 46 to 48 approximately at 27" , so you are pretty much drawing what I do .
I shoot mostly 45 to 50# bows, and draw 27" on most of them.
Spine wise the majority I shoot are a 500 spine , heavy shaft , like a Carbon express Heritage series {heritage 90 spine is close to 500spine , 150 is close to a 400 spine.}, These days my shaft of choice is Bearpaw Penthalon Hunters with long inserts. Depending on the bow I will be using a 500, or a 400 spine with a point weight of 175 to 300 grains. I cut all my shafts to 29"
Unless you have a very high performing bow like a Border, or ACS I would bet a 500 spine will be a good choice for you with a 175, 0r 200 gr point. .
Order an assortment of points, they are cheap and make it easy to find the right spine shaft you need. Get at least 6 of each,125, 145, 175,200,250,300 grains. Points are cheaper than guessing on what shaft and spending money on shafts.
What bow do you have? I might be able to guess closer, to what you will find works. PM me if you want , or email
pete@peteward.com
My total arrow weight is usually 500 grains and heavier , and sometimes up to 800 grains. The majority run between 500 and 625 grains. I don't shoot just 1 bow,
Pete