I have several 99's and 1899's with Lightfoot mounts including this 303 SRC. I think the mount may even help with accuracy since it makes a solid bridge between the barrel and receiver. When I was working up loads for this SRC I shot a 5 shot 7/8" group at 100 yards with 150 grain round nose bullets and I believe 27 grains of 3031. When I upped the load to 30 grains of 3031 it still shot two 1 1/8 to 1 1/4 inch groups. This is the load I used to kill the elk in the 3 favorite gun post.
David