I love BH209 but it eats breech plugs. When the accuracy goes south,
check the flash hole for enlargement.
My first plug (Omega) lasted 250+ shots with T7 and pinnacle, the second one app. 75 shots with BH (110 gr. volume) with some primer side erosion.
Maybe it's the primers (win.209)
I'm going to try the primer pockets with small rifle magnum primers next
range session (BH does not recommend this)
I wish they would make a steel breech plug (non stainless) forthese!
This would make the perfect poor mans MZ imho