Hi,
I'm new to reloading and am hoping to improve my understanding of how powder choice and charge will affect accuracy given all other elements are identical. The reason I ask is in the Lyman manual has "most accurate" powder choice and charge weight is printed in bold. I've been experimenting with various combinations of components trying to find a load that shoots the way I like (soft, quiet, not smokey, clean, and safely over minor power factor), but I don't want to create something that makes it harder for me to hit the target; I'm a bad enough shot on my own
My question is this: How can a powder's accuracy be inferred without taking the time to do the testing? Case filling at the desired charge? Powder shape (flake, ball, tube)? Is the only way to know to shoot groups yourself? Or is powder accuracy such a small factor that I should not spend any time worrying about it?
Here are a few things I think I've learned/know. Please feel free to correct any statement that is wrong.
* Faster powders, like VV N320, and heavier bullets, like 147g, will produce less recoil and smaller shock wave (eyeball jiggle).
* Grouping cases by headstamp will reduce shot to shot variation
* Lead, moly, and FMJ bullets smoke more than CMJ and hollowpoint bullets, and powder choice will also affect smoke
* Faster powders are only able propell a bullet so fast without creating too much pressure. To increase speed, a slower powder may be needed. A good powder for a 147g bullet (like N320)may not be the best choice for a 124g (maybe N330 would be better).
* Powder combustion is more complete when charges are closer to the maximum.
Thanks for all your contributions. I've been lurking for quite a while and I've found the answers to many of my questions here in Brian's forum.