Sierra 6mm 107HPBT Matchking caution

K

K31Scout

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Minuteman
Dec 19, 2010
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#1
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.
 
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#3
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.
 
#4
K31Scout said:
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.
Click to expand...
CN stands for Closed Nose.
 
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#5
Serria jackets are all the same composition, 95% copper and 5 % zinc.
The lead alloy ...or pure lead adds or detracts from the bullet hardness, depending on use, or recommendation...hunting or target.
The "C" or "CN" suffix is the closed nose design, which brings a higher BC to the bullets.
I like them and prefer them in various calibers...
 
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