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  #11  
Old 05-03-2020, 11:40 AM
Kevin Gullette Kevin Gullette is offline
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Lightbulb Back in the day........

I seem to recall that, with the 11 degree crown, the angle of escaping gases was "optimized" when using boat-tail BR bullets.....of the day.

Remember......I said I "seem" to recall.

Kevin
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  #12  
Old 05-03-2020, 12:25 PM
Al Nyhus Al Nyhus is offline
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Quote:
Originally Posted by Kevin Gullette View Post
I seem to recall that, with the 11 degree crown, the angle of escaping gases was "optimized" when using boat-tail BR bullets.....of the day. Kevin
Correct. -Al
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  #13  
Old 05-03-2020, 02:15 PM
Bayou City Boy Bayou City Boy is offline
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Quote:
Originally Posted by Kevin Gullette View Post
I seem to recall that, with the 11 degree crown, the angle of escaping gases was "optimized" when using boat-tail BR bullets.....of the day.

Remember......I said I "seem" to recall.

Kevin

As Ray stated, it was what BR shooters thought at the time gave them an edge based on some very limited studies, both "scientific" and some not so scientific. Like Kevin said, most of the "more scientific" information was based on BT bullets used at the time. It worked so the BR crowd jumped on it and it became a legendary fact that others have followed.

Some even believe that the 11 degree target crown is less susceptible to damage than most other crowns because it shields the sensitive area near the bore and that other crowns are more easily damaged. ?? Again, in some people's minds.

In fact, you will be hard pressed to find one crown that will noticeably outperform another - if it is square to the rifle bore, and properly machined. The bottom line is that actual crown angle has very little to nothing to do with accuracy. The crown itself at whatever the depth that it is cut does. A good crown is good at whatever angle it is, same same with a bad crown job.

Shooters are a group as a whole that follows what someone else thinks is a winner. This is just one example of that. If a certain new cartridge starts winning BR matches, very soon everyone else who is competitive and wants to win badly has a rifle chambered for the same new and perfectly designed (inherently accurate ) cartridge. And "the beat goes on" like the old song said........ In fact, the machinist doing the work determines whether a feature is accurate or not, whether its the barrel crown or the rifle chamber itself.

JMO (note the qualifier) - BCB
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