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2/21/2011 3:19:03 PM EDT
I've been trimming cases to 1.750.  Trying to load for precision so Im trying to do everything right.  I had 3 rounds of black hills 77gr on the desk and I measured the cases.  They were all different, 1.753, 1.757, and 1.759.  What gives?

 Shouldnt cases be at 1.750, and shouldnt factory ammo of this type be a little closer in specs?
2/21/2011 3:20:10 PM EDT
[#1]
Quoted:
I've been trimming cases to 1.750.  Trying to load for precision so Im trying to do everything right.  I had 3 rounds of black hills 77gr on the desk and I measured the cases.  They were all different, 1.753, 1.757, and 1.759.  What gives?

 Shouldnt cases be at 1.750, and shouldnt factory ammo of this type be a little closer in specs?


Red or blue box?
2/21/2011 3:22:25 PM EDT
[#2]
Red.
2/21/2011 5:02:36 PM EDT
[#3]
If it's under 1.760" it is in spec. Commercial ammo isn't as closely monitored as handloads. They have minimums and maximums and as long as the round passes those tests it is good to be sold.
2/21/2011 5:10:20 PM EDT
[#4]
Quoted:
I've been trimming cases to 1.750.  Trying to load for precision so Im trying to do everything right.  I had 3 rounds of black hills 77gr on the desk and I measured the cases.  They were all different, 1.753, 1.757, and 1.759.  What gives?

 Shouldnt cases be at 1.750, and shouldnt factory ammo of this type be a little closer in specs?


How do you know it's not the chamber stretching the fired cases out a bit inconsistently?

Maybe the 1.753 piece was annealed more precisely and had a bit more spring back than the 1.759 piece?

Inquiring minds want to know.

Anyhow, two pieces of printer paper isn't a whole heck of a lot.

Their brass isn't hand sorted, like the Nosler stuff, I'll gander.

Don't sweat the little things.

Chris

2/21/2011 8:27:30 PM EDT
[#5]
If you're really worried about it, pull some of the factory loads and measure. I've heard brass can stretch different amounts depending on the temperature of your gun when shooting.
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