|
Tac is probably too fast for most bullets in the 243. It might work well with the 55 gr. varmint loads.
It is possible to work up safe loads for a rifle, but it takes a little equipment, and much common sense. First, you really need a chronograph. Then, you can take a "similar burn rate" powder (4895, in this case), and start at, or slightly below, the minimum charge weight for that powder. Chrono those loads as you increase the charge weight. When you get close to the listed maximum velocity for the alternative powder, OR the moment you see the classic pressure signs, quit. If you don't know what the classic pressure signs are, don't even start!
Another option is to ask someone to run an internal ballistic simulation for you, using a program such as Quickload or Load from a Disk. If you provide enough accurate data (including measured case capacity, seating depth, distance to lands, etc), they can give you a "pretty darn close" estimate on starting and max loads. Again, a chronograph is needed to calibrate the software to perform at it's best.
Loading without data is best done with a goodly bit of experience under your belt, lots of common sense at your disposal, and without a great "need for speed". If you are at all uncertain about how to go about it, don't. HTH, Dutch.
|