I just started reloading for my M1917. I'm using a Lee Classic, to get my feet wet. My first batch shot well (for me) doing slow-fire. I used 125 gr. Speer TNT for reduced recoil, and they felt nice.

Then I reloaded the same casings a second time, and tried them in rapid fire: the first two cartridges both fell apart during feed, with the bullet pulling out of the casing.

I'm wondering if I need to crimp bullets if I want to use the magazine? The Speer TNT have no crimp ring. Or maybe there's another factor (the smaller bullets are shorter in the neck; or that I didn't polish inside the neck; or that I need to check the feed ramp)?
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