SPINE	OUTSIDE DIAMETER	GRAIN PER INCH	LENGTH	RECOMMENDED POINT
2.000"	4.96mm	3.60	32"	50gr
1.800"	5.00mm	3.89	32"	50gr
1.500"	5.05mm	4.00	32"	60-70-80gr
1.300"	5.18mm	4.16	32"	60-70-80gr
1.100"	5.22mm	4.64	32"	60-70-80gr
1.000"	5.32mm	4.90	32"	60-70-80gr
0.900"	5.36mm	5.34	32"	60-70-80gr
0.850"	5.42mm	5.48	32"	60-70-80gr or 80-90-100gr
0.800"	5.48mm	5.80	32"	60-70-80gr or 80-90-100gr
0.750"	5.50mm	5.94	32"	80-90-100gr
0.700"	5.58mm	6.17	32"	80-90-100gr
0.650"	5.60mm	6.42	32"	80-90-100gr
0.600"	5.71mm	7.09	32"	80-90-100gr or 100-110-120gr
0.550"	5.77mm	7.47	32"	80-90-100gr or 100-110-120gr
0.500"	5.88mm	8.00	32"	80-90-100gr or 100-110-120gr
0.450"	5.99mm	8.63	32"	80-90-100gr or 100-110-120gr
0.400"	6.13mm	9.47	32"	80-90-100gr or 100-110-120gr

https://www.skylonarchery.com/images/chart/chart%20target.pdf