A 35 caliber, 200 grain bullet moving at essentially the same speed as a lighter and smaller 30-30 bullet "less" effective? Holy defies physics Batman!
Not if you understand physics. A 170 gr 30-30 bullet will easily out penetrate a 200 gr 35 caliber bullet. The only advantage a 35 has over a 30-30 is in the minds of those who want to see a difference.
I have no ax to grind with the round, but it isn't anything magical either.