Very interesting..
I don't put much stock in that article. If they would have shown a photo of a handful of each round sitting in an arc with the bullets touching, they would be the same arc/angle. And the feed ramp is what gets touched with the bullet anyways. And the bullet will not be in a downward push on its exit.
How about those reloaded 9mm? Would it be straight wall after resized? need to check on my reloads.
There's always a trade-off. Taper helps insure reliable extraction. Straight wall helps the feed process. 112 years of success tends to make me thing the 9mm Parabellum is good enough.
The 9mm Luger is a relatively sharply tapered round. The .380 Auto, .38 Super, 40 S&W and .45 ACP are much more straight.
If you are running mixed brass in your 9mm reloads I caution that you need to set your taper crimp to run with the THINNEST brass you may encounter. Because of the sharp taper, the 9 is more subject to bullet setback upon feeding. This causes a huge pressure spike in a small case, such as the 9. I run a 0.376 taper crimp to limit this possibility.
If you are running mixed brass in your 9mm reloads I caution that you need to set your taper crimp to run with the THINNEST brass you may encounter. Because of the sharp taper, the 9 is more subject to bullet setback upon feeding. This causes a huge pressure spike in a small case, such as the 9. I run a 0.376 taper crimp to limit this possibility.
Thanks for advise. Will always extra careful.
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