Where are you getting the points from? I use WW online and I think I started in the high 30s and I weighed 230. so 48 could be right. In order for you to lose 1 lb you will have to reduce your caloric intake by 500 calories per day. Your weight pf 317 required 2627 calories a day to sustain itself in a sedentary lifestyle. so 2627 48 points is roughly 1440 calories, so you will be reducing your caloric intake by 2627-1440=1187 calories (1187 x 7= 8309/3500=2.4 lbs a week weight loss)
Seems legit.