im shooting a 11tw in a 300 Norma with 210Amax,my speed is higher but it works well.
twist is based on bullet "length" not weight.It just happens that longer is usually heaviet.
you wont have any problems with 10tw as i shot 200SMK in a 30-06AI very well with an 11tw also.
http://bulletin.accurateshooter.com...t-rate-with-berger-stability-calculator/
