I recently purchased a s&W model 10-8 serial # 3D97### Bill Davis custom Aristocrat. I will use it to shoot 25 yard bullseye. I am looking for a set of match grips. The Hogue are to small to support the weight. I am looking at a set of Nill-Griffe match grips. I need to know the frame style. I believe it is a K frame square butt frame but Nill needs to know for sure before I order. How do I tell?