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I can't help out with the Elk scenario, but we punched lots of Texas white tails with the Speer 150 & 180 gr. None of them stayed in the animals so no post mortem bullet analysis.
Both bullets left maybe 1-2" exit holes, depending on where the impact was.
When I started out loading in the early 70s for the 303, I wanted to try Sierra bullets. I loaded some and went to the range and shot a good 22" group at 100 yds. I was pissed to say the least.
I got home and checked everything, then I figgered I would do some bullet checking.
Long story short, The entire box of bullets was marked 0.311" on the box, but they all measured 0.309", which was totally unacceptable to me.
That is when I went to Speer. Of course the 1st thing I checked was diameter and then weight. Each and every one measured 0.311" as labelled on the box.
There was another issue I had with Sierra bullets before this, but this incident put the icing on the cake, and I have not used another Sierra bullet since then.
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