This is a discussion on IMR-8208 XBR within the Product Review Requests forums, part of the SniperForums.com & SniperCentral.com Related category; So, what length is your barrel? How tight is the bore? What barrel was used in the testing that gives the "factory" velocities? Lots of ...
So, what length is your barrel? How tight is the bore? What barrel was used in the testing that gives the "factory" velocities? Lots of variables to consider, so "your mileage may vary."
It takes 47 muscles to scowl, and only 17 to smile. Proper trigger squeeze takes 3. Relax, and go with it.
This powder has the same burn rate as the old XBR but was developed 6 years ago for the military with the goal to be very temperature stable. I have been using it for 5 years in my .308 and had excellent results.
175 GR SMK, BR2 primers and Lapua brass with 41.5 gr My 26” Lilja barrel 1/10 twist loves this load, ½ moa at 500yr
Last edited by Talkeetnaairtaxi; 11-02-2013 at 03:36 PM.
I just finished some extensive testing of this powder in my newly rebarreled rifle.
175 gr SMK
Lapua Brass 3X fired, annealed and F/L sized
42.2 gr IMR 8208 XBR
2704 fps from 24" Benchmark 5-C barrel
SD= 8.6 Mean Absolute Deviation (avg dev, above/below overall averag) of 6.3 FPS.
Accuracy of .240 MOA @300 yards (range max dist).
Haven't tested with 168's yet but expect similar results. My loads seem to really yield good stat's and small groups when up near the max published load. The above is only .3 gr less.
BTW, this Benchmark barrel is one quick tube.
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USAF 1966-1970, SEA 69-70