Any ideas?

I've been shooting this load in my rifle for several years it is proven,but after coyote hunting the other day I noticed this.It is the one and only time I've ever seen it happen.View attachment 311037
We are warned about subtle differences from one lot to another with most reloading components . Did you have a large quantity of components of the same lot ? If you don't mind me asking what is your Load, could there be a tamp sensitivity issue ( you having used this load forever ) i'm probably way off . I just hate things that just dosen't make sense.
 
Yeah brother your load seems to me to be right there were it should be have you always used these primers ? I too have a 6.5x284 that just got a new criterion barrel 26 in. 1-8 twist and am looking for load that she likes. If I can get my hands on some RL 23 i'll give your load a try !
It's been working for me for quite some time
 
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