RE: SCOPE POWER FOR .243 WSSM
I would put the 4-16 on your HMR, and the 6-24 on the WSSM.
The .17 HMR is only a rimfire. It' s accuracy depends on the wind. Ususally, the round MIGHT make it out to 200 yards with accuracy, with a slight breeze. The .243 WSSM will reach a greater distance then the HMR, since it is a faster round and a heavier bullet. I beleive the HMR only goes 2660 FPS....not positive on that though..... I would put the 6-24 on the WSSM. Just my opinion.