Originally Posted by
ronlaughlin
Perhaps the reason you don't have the ability to explain why the dome shape reduces back pressure, is because it doesn't.
This statement is 100% wrong Ron.
I tested both ventliners in the Savage. The Savage is buy far the most pressure sensitive on primers then any other ML made. And this incudes CVA. The flat ventliner bulged more primers buy far from the dome ventlinter. Even the domed ventliner in the savage would bulge some as well. The domed ventliner made the over all pressure on the primer substantially less/better.
The above testing was done with smokeless powders. Results could change with BP substitutes but i doubt it.