I got the 15 oz weight from your earlier post, it does seem kinda heavy. I fixed a Remington 597 in 17hmr for a friend a while back. The bolt for it did seem suprisingly heavy for its size. Since you probably can have more than the 2" of bolt travel that the other 17hmr's have, can you use a lighter bolt and a rubber bumper? I found link to a guy who makes custom 10/22 mag bolts for the 17hmr and his are 17 oz.