I'm not sold on the copper build up issue, as one of the 416 Rugers I know of did it with the very first 3 shots out of the brand new barrel, certainly wouldn't have been copper fouled. Double D's theory on the air temp might be plausible, but if the factory ammunition is loaded THAT hot, enough to expand primer pockets to the point of a new primer not even being able to be re-seated, then in my humble opinion, the ammunition here is the issue. I'd say Hornady wanted to break the magic 2400 fps figure, and kept going until they did, marketing hype and all that.
I'm currently waiting on chamber reamer prints from PTG, it is their reamer my gunsmith used to do the 3 rifles around here, wanting to see what amount of leade they set.
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Re: 416 ruger popping primers
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