flintlok wrote:hungryrob wrote:H4141!!!! NOT H110, sorry!
49.5 grains, loaded with federal magnum primers.. Twas a hot load, beware!
I thought it strange that you using a Magnum handgun powder to load 243 however I seen some strange things .....................
The last fellow that I know who did that lost three fingers and destroyed his Winchester Model 1894. Some fellow had placed handgun powder, I believe it was Bullseye, into a empty can of IMR 3031. The can was passed to another fellow who gave it to my friend because he didn't reload. My buddy used the IMR 3031 rifle load data to construct his ammo with the powder and the first shot went "blewey". After the gun blew up and before my buddy went to the hospital he went home and checked his powder scale. He just couldn't believe what had just happened. No matter, his loads were correct but it was the powder that was off.
Ewe, mixing powders is evil stuff. Life is for learning. Fact is I already knew large rifle primers were best but (as noted above) the answer had slipped back into memory. That's one of the reasons we as a species keep periodically reinventing the wheel. I had slipped into the "magnum must be better" way of thinking. That was probably assisted by the fact that I have more of them than anything else. They worked well in my .300 WM. I sold the .300 last week so odds are I'll have no more use for them at all.
Your argument that all primers are chemically identical is interesting. There must be more to it than just mix, for instance you mention shape (presumably internal). There must be something to explain my test results, ranging from a 1" group using CCI 200's to 3.75" with CCI 250's. Stumbling along trying different things and keeping notes along the way (safety being paramount) is a fun part of the hobby.
Given that going to a magnum primer is said to increase mv by 100 fps, I wonder if using a magnum primer and reducing powder weight is practical? The first objection I see is inadvertently straying into the situation where light loads cause blow ups? Either way it is just a passing thought and doesn't strike me as being a good idea. There's a lot more to a good load than just mv.