Douglas,
JJ Perodeau at Champlins can install claw mounts on your Chapuis. A scope on a 9,3 really enhances its hunting ability.
65 grains of IMR 4831 shoots very good in my Chapuis with 286 Woodleigh Softs, 286 Nosler Partitions, and 285 Hawks with the .035jkt. They all hit in the same group to 200 yards.
With the 270 Speer 59 grains of RL-15 shot good also.