CXR,
Be aware, H4198 is a faster burning powder than BENCHMARK - It will give you even slower velocities within max safe limits (don't use it). Check this powder equivalent chart out from the makers of the powders you are talking about. Fastest burning at the top to slowest down the bottom;
http://www.adi-powders.com.au/powder-equivalents/
For a 100-125gn bullets out of a 20" barrel the most efficient powders in a range are 8208 to 4895. I recommend 4895, and a chronograph so you know what's going on.
Plus, access an internal ballistics program like Quickload so you can do What-if's to find the best powder for a bullet, barrel length and calibre combo without having to buy it.
Be aware, H4198 is a faster burning powder than BENCHMARK - It will give you even slower velocities within max safe limits (don't use it). Check this powder equivalent chart out from the makers of the powders you are talking about. Fastest burning at the top to slowest down the bottom;
http://www.adi-powders.com.au/powder-equivalents/
For a 100-125gn bullets out of a 20" barrel the most efficient powders in a range are 8208 to 4895. I recommend 4895, and a chronograph so you know what's going on.
Plus, access an internal ballistics program like Quickload so you can do What-if's to find the best powder for a bullet, barrel length and calibre combo without having to buy it.