.257 Weatherby Mag. case "dents"
This happened yesterday. They are once-fired cases loaded with a Speer 87 grain spirepoint, 62.0 grains H4831, and CCI 250 large rifle magnum primers. This happened to two cases, out of eight. There was no difference in recoil, extraction, etc. Just behind the shoulder, the cases have indents(similar to overlubed cases while resizing). I stopped at the local gunshop to see if anyone had ever seen this before, they all scratched their heads and said "nope". Anyone have an answer or idea?
0
-
I seem to remember reading somewhere about this phenomenon some years ago. In low pressure loads, especially with large cases, the pressure will get between the case and the chamber wall before the case has a chance to obturate and causes the dents. That was the theory, anyway. 0 -
Come to think of it, there were some black "soot" marks on the other cases. I had the same thought, but the guys at the gunshop were quick to dismiss it. Could it have anything to do with the type of powder? 0 -
According to my Hornady manual, that load is close to the start load for the Hornady 87 grain. It is possible that low pressure syndrome caused the indentations and sooted cases. 0 -
I have checked all four of my reloading books,(Hodgdon, Lyman and 2 Barnes) and I can not figuire out where I came up with 62 grains. I guess, I must have gotten mixed up with another powder. The good thing is,they were underloaded and not overloaded. Thanks for your help. Jim. 0 -
Oil in the chamber??
Underloading with some powders can be as dangerous as overloading.0 -
Oil in the chamber was my first thought. I swabbed the barrel and chamber and dried them both out after the first shot. I then fired six more shots, no dents, then the eighth shot was the second case that dented. They were underloaded by 4.0 grains.It does not seem like alot, but maybe thats enough. 0
Please sign in to leave a comment.
Comments
6 comments