I've been lurking and learning here for a couple years, but mostly contribute on Kifaru. I consider Kifaru to be the very best forum for backpack hunting. And, along those same lines, LRH is the very best forum for practical long range field shooting. The knowledge base found here seems to be unmatched with regard to long range shooting.
I generally prefer "getting close" when hunting, but really enjoy longer range precision shooting. The procurement of a new Remington Sendero II in 300 RUM last year was a bit of an outlier for me as I'm predominantly a backpack hunter and lighter is better when it comes to getting a long ways back into the high and lonesome. But, the long-range bug bit me and I wanted a decent long-range platform that I could eventually have converted to a 338 Edge by Shawn Carlock.
I originally posted my problem over there, but it occured to me that by posting my experience here, I would a) garner some better information and subsequent solution, and b) perhaps the thread would help others avoid the same problem.
Thanks in advance for your input! - Allen
Here is the cut-and-paste (with slight edits) from my original post over on Kifaru....
I've never seen this first-hand before and thought it best to post up a couple pics and background on the particular situation before hurting myself or someone else on the firing line.
.300 Remington Ultra Mag - brand spanking new Remmy Sendero II
Nightforce 5.5-22X56 zero-stop with NF rings and bases, DE level and ADI
The usual anal retentive case prep including mild neck turn ( http://www.6mmbr.com/jgcaseprep.html
A middlin' load of 90.7 grains of RE-25 behind a 175 SMK seated exactly to Sierra reloading manual specs.
Next step...off to fire-form the brass at the range and have some fun with this new rifle....
First round sent downrange was on the right. No chrony readout. Great.
Second round downrange resulted in the alarming oddity just below the shoulder. Again, no chrony readout. Damn thing was acting up.
That's precisely when the fun stopped.
Has anyone ever seen this before? And, much more importantly, what to make of it?
My second post on the thread to clarify some questions:
I suppose I should have noted that this was brand new brass. Nope, couldn't have been a lube issue since I use a minimum of RCBS Case Slick and religiously wipe down the case when it is no longer warranted in the loading process. Besides, a clean case helps when it comes to writing the powder charge on the side with a Sharpie. Chamber and bore were pristine and ready to be (post-factory) de-virginized.
Oh, and Flamingo, the cases were not "smoked". The only micrometered difference in the two, other than the obvious dent in the side of the one (which eventually experienced a quick wipe and a look-see with a magnifying glass), is the slightest midgeon shown on the one on the right on the shoulder just under the neck. Pretty darn clean actually.
I just can't figure out why, all things equal, that this would have happened.
I'm a newbie when it comes to stuffing this much powder in a case this big and am admittedly a wee bit apprehensive about touching more of them off if this is a potentially serious problem. I'd prefer to keep my cheek bone where it's at. Same goes for eyes, hands, etc.
Should I be concerned or just chalk it up as a fluke?
Thoughts? Once again, thanks in advance.