WCG Posted May 11, 2021 Report Share Posted May 11, 2021 Hi,The two 1919A4s that I have were ex-film guns and had BFAs in the front of the bearing.They were tapped out to 16mm (5/8") thread and the BFA put in from the inside.The centre of that thread is only about .555" diameter, so much smaller than the .718" I see quoted.With modern commercial 30-06 will I be over boosting ?If so what are the tell-tale signs?I don't like to remove metal unless it's really necessary, so I'm resisting boring out to .718".Any advice welcome Link to comment Share on other sites More sharing options...
hkg3k Posted May 15, 2021 Report Share Posted May 15, 2021 In my experience...yes, you'll over-boost the gun with a 0.555" oriface while running 30-06. The symptoms my gun experienced was a very choppy, inconsistent cycle...the bolt really hammers the back-plate. Link to comment Share on other sites More sharing options...
DINK Posted May 15, 2021 Report Share Posted May 15, 2021 Boosters are relatively cheap and easy to install. Get one for .30-06 and put the modified one aside for possible use with blanks in the future or for sale to someone who needs it. Get a .308 one while you're at it. Link to comment Share on other sites More sharing options...
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