From memory, based on the 4 adult russians I have had:

Straight
carapace Weight
length in grams

4.25 400-425

5.25 525-600

6.25 900-1000

7.00 950-1150

Weight varies with season. My torts may be a little overweight, but show no signs of obesity.

The smaller torts are males, the larger females. The three larger specimens have a shell shape similar to the one in your photo. The smallest specimen was flatter and possibly a different subspecies.

From the picture it looks like your russian is showing some growth. I also don't see any excess flesh around the legs or neck.