Why am I getting smokey shoulders on two different BRA chambered barrels?
My first barrel the dimensions were a touch off so I just figured it had something to do with that.
Now with a new barrel I’m seeing the same thing. First firing of Lapua all necks seem to seal up tight with no carbon on shoulder. I went and checked some speeds with once fired and sure as shot they all have carbon down the shoulder.
Virgin Lapua was running 2750-2760
Once fired I went from 2785-2850 all showing Smokey shoulder.
Brass prep went as follows:
Amp annealed
SAC modular w/ .263” bushing and .2405” mandrel
Shoulder was not pushed back on these as they chambered w/o resistance.
My first barrel the dimensions were a touch off so I just figured it had something to do with that.
Now with a new barrel I’m seeing the same thing. First firing of Lapua all necks seem to seal up tight with no carbon on shoulder. I went and checked some speeds with once fired and sure as shot they all have carbon down the shoulder.
Virgin Lapua was running 2750-2760
Once fired I went from 2785-2850 all showing Smokey shoulder.
Brass prep went as follows:
Amp annealed
SAC modular w/ .263” bushing and .2405” mandrel
Shoulder was not pushed back on these as they chambered w/o resistance.
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