RE: Light 243 load?
Here are some reduced loads form the "Speer Reloding Manual" #12:
Cartridge: 243 Win.
Case: Win.
Primers:CCI 200, 250
Barrel: 22"
Bullet: 85 gr. SPBT
Powder: IMR 4198 MIN: 17.0 grs. VEL: 1796 f/s MAX: 19.0 grs. VEL: 2005 f/s
Bullet: 90 gr.
Powder: IMR 4198 MIN: 17.0 grs. VEL: 1766 f/s MAX: 19.0 grs.VEL: 1990 f/s
Bullet: 100, 105 gr. GS-SP, SP
Powder: IMR 4198 MIN: 18.0 grs. VEL: 1752 f/s MAX: 20.0 grs.VEL: 1965 f/s
Good luck.