Re: 243win powder
Here's a paste from another source: No secret - alot of us visit that site.
Preferred Powders--Match Your Propellant to Bullet Weight
For the heavy bullets, in the 100-115 grain range, modern slow-burning extruded powders produce great accuracy with low ES and SD. With the 105-107 grain match bullets, try H4831sc, Reloader 22, Reloader 25, and Vihtavuori N165. Sierra's recommended Hunting Load for its 100gr soft-point FB and BT bullets is 36.2gr IMR 4064 at 2900 fps. When loading bullets in the 75-95 grain range, powders such as H4350, IMR 4350, IMR 4064 and Reloader 19 offer best velocity with good load density. Many long-range varminters recommend H414 with the 87gr V-Max. For the light varmint 60-75 grain varmint bullets, you can use faster powders, such as Hodgdon Varget, H414, and Vihtavuori N140. For the 70gr BlitzKing, Sierra suggests a load of 38.6 grains N140 at 3200 fps. Maximum velocities with the lighter bullets can be achieved with ball powders such as Winchester 760 and H380. Click Here to download Sierra Bullet's complete .243 Winchester Load Map as a .pdf (Adobe Acrobat) file. With data for two dozen powders, this provides suggested loads for Sierra's entire 6mm bullet line-up from 55 to 107 grains.