Anyone else had a Blaser R8 Dog?

I’d be tempted to ‘slug’ the barrel the find out what the groove diameter is, it may be on top limit which may explain your issue?..
 
While everything shoots well in my R8 I had a similar experience with TTSX in 6.5x55. Loaded way below book max but some crazy pressure signs, blown primers, case head separation… all the good stuff. Still very accurate though. COL very important when dealing with copper which is where I think I went wrong with TTSX… also the canulars on that stuff grip like hell. I ended up committing to sako super hammerhead in my 30-06 barrel. Give it a good scrub through and put a couple of boxes of that through it and you know if its the loads or a duff barrel as the sako stuff it decent.
 
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