So I have at least two different references........Lyman 5oth, which says crimping is required for reasons given above, but otherwise, is detrimental to accuracy. Then the LEE loading manual, which says accuracy is enhanced by a crimp? The reason they gave was the extra resistance of the crimp will cause pressure to rise to a higher level than just neck tension alone, leading to a more consistent powder burn. But if "accuracy is improved by a crimp" was mentioned once, it was mentioned five times. So two manuals, two different recommendations for something I would think would be settled science by now. As a newb trying to wade through all this, such inconsistencies wear me out.