February 6th, 2010

Mock Demonstrates IMR 8208 XBR Accuracy and Wide Load Window

The new IMR 8208 XBR powder is quickly acquiring a reputation for accuracy and pressure stability over a very wide range of temperatures. In addition, it looks like 8208 XBR has a huge load window for accuracy, at least in the 6 PPC cartridge. Here are five successive targets shot by journalist James Mock. With loads range from 30.5 grains to 31.5 grains, Mock nailed five “zero” groups in a row. (These were all three-shot groups.) Mock nailed “zeroes” over a full grain load-weight spread. That’s very impressive, and it bodes well for those who want to spend less time “tuning” their loads.

IMR 8208 XBR powder

James observes: “[Here are] 5 consecutive ‘zeroes’ with charges from 30.5 to 31.5. I used a Krieger barrel (583 rounds) and a BAT Model B action. The bullets are from Del Bishop. I used both Wolf SR and Fed 205 primers.The combination that I used that day was really working. The Bishop 65 grain FB bullets were seated to just touch the lands in a barrel with 583 rounds.”

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