Ed the Brown fiberglass stocks can be ordered with graphite reinforcement to the grip and fore end which will make the affected area very stiff.The Pound'R is made entirely of graphite but I don't think that's what you have.
The Brown has always been a comfortable stock to shoot regardless of caliber.My old 375H&H on a M70 has a Brown that dates back to the 80's and was always a pretty easy rifle to shoot despite weight 8 pounds ,scope included.
