Sierra 6mm 107HPBT Matchking caution

K31Scout

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Minuteman
Dec 19, 2010
59
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MI
Bought from Midway, Sierra makes 2 versions of this bullet. I ordered (and returned) a 250 count box and they have 107gr HPBT-CN on the box. Product #1570MP. These are a copper/nickel jacket and seat .020" deeper in my chamber according my Hornady gauge. Midway does not say anything about the copper/nickel. The are a dull copper color and the ogive is obviously different.

My 100 round boxes I've been using are #1570 and have no CN.

I would have tried them but I have a great load worked up with the all copper jacket #1570 tuned up for a set COAL.
 
It's a different construction and shape. It's Copper-Nickel product number #1570MP.
The bullets I've been using for years are copper jacket only, no nickel product number #1507.
I sent them back, otherwise I'd take a picture but they are obviously different.