Comments on: Jackie Schmidt Tests New IMR 8208 XBR Powder — Results are Very Impressive https://bulletin.accurateshooter.com/2009/12/jackie-schmidt-tests-new-imr-8208-xbr-powder/ from AccurateShooter.com Sat, 11 Jul 2026 20:26:03 +0000 hourly 1 https://wordpress.org/?v=4.1.26 By: eric kennard https://bulletin.accurateshooter.com/2009/12/jackie-schmidt-tests-new-imr-8208-xbr-powder/comment-page-1/#comment-3402 Fri, 18 Dec 2009 00:31:27 +0000 http://accurateshooter.wordpress.com/?p=10570#comment-3402 You don’t have to wait. 8208 is avaiable at Powder Valley now. I have 16 lbs. on the way and will let you know how it works in a 6BR.

]]> By: Steve Blair https://bulletin.accurateshooter.com/2009/12/jackie-schmidt-tests-new-imr-8208-xbr-powder/comment-page-1/#comment-3401 Thu, 17 Dec 2009 20:31:19 +0000 http://accurateshooter.wordpress.com/?p=10570#comment-3401 QUOTE
I guess this shows that some of the powder is still burning at 21 1/2 inches.
UNQUOTE

The bullet will continue to accelerate as long as residual pressure is sufficient to overcome bore friction and bullet inertia. Even if all the powder is burned, bore pressure remains high and velocity continues to increase. Clearly, there is a point of diminishing returns as is especially seen in .22 rimfire barrels.

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