20BR

[Alycidon]

I have a thread here detailing my load developement work to date on this caliber.

 

To date best accuracy so far is when using a reduced load of 28.0gr x N150 producing around 3350fps using a Fed 205 primer in Lapua 6BR reformed brass. Another accuracy node is at around 29.5gr x N150 and 3500 fps. Between the two it still shoots in the .4/.5s though !!. Above 29.5gr I get slight cratering of the primer. 32.0gr x N150 will get it to 3800 with severe cratering and web expansion, this would lead to very short brass life. Accuracy was no better.

 

Been doing some early work with BR4s, they show less cratering but not tested velocity yet. Also tried N160 and N550 but no benifit over N150.

 

All loads are 2 thou off the lands.

 

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