I was shooting those arrows out of my 50# Kota longbow. You will need to keep them full length, and add 175gr up front to start. What is your draw length, and weight? I draw 27, so I was pull ing 47# shooting full length with the 175 up front. They flew perfect, and bare shafts hit exactly with my fletched. I will admit they were not the most durable arrows, and on the light side I delieve 6.7gpi. If you have any qusetions when you start to tune them feel free to PM me, and I will do my best to help. Oh I'm not sure what the inside diameter is.
SD