I was not able to post yesterday. Chuck H is correct. Each stock is an individual. Each one is an adventure. If the bender knows what to do and when..... the guns will NOT bend back over time. The average rule of thumb is: no stock may be bent past 1/2" in any direction. Each stock is different. I have bent many stocks in the past 30 years. No two were alike in how they reacted to the bending process. The bender is the one who uses his eyes and ears to do the job well. The actual process has been detailed out carefully for many years. It is not rocket science....just science applied to organic composition to make shooting more fun!