Sierra 6mm 107HPBT Matchking caution

[K31Scout]

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.

 

[pabrousseau]

I always expect ogives might be different on different lots of the same bullet . What are you saying that I'm missing?

 

[K31Scout]

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.