Talk:6.5×47mm Lapua

Donut problem?

The article mentions a "donut problem" resulting from loading the same cases over and over, in the description of one of its images, which I find very long for an image description. It would be interesting if this text could be moved and explained in better detail in the article body instead, so that the average person may understand what this "donut problem" is. 176.154.184.23 (talk) 08:03, 30 March 2017 (UTC)

The "donut problem" is probably not much interest to anyone other than reloaders, and casual reloaders probably aren't even aware of it. It will be difficult to find proper sources, as it is mostly discussed and debated among reloaders on specialty forums. The donut problem results from two phenomena working together. One, at the junction of the shoulder and neck, the neck is stiffer so it gives more resistance to expanding when the bullet is seated. Some reloaders like to seat the base of the bullet slightly below the base of the neck and can feel the bullet snap into place. This alone doesn't cause problems because it is only a slight increase in tension and can help maintain consistent "bullet pull." Two, resizing causes some material to flow into the neck causing it to be thicker near the shoulder. This is the dreaded "donut." This is because firing expands the case, and sizing the case back down causes it to lengthen, pushing material into the neck. This is why you have to trim the neck after sizing. These two together can cause significant resistance to seating the bullet past the base of the neck. The increased tension can hold the bullet so tightly pressures can spike well above normal, causing damage to the firearm and rupturing the primer. DrHenley (talk) 17:10, 4 March 2018 (UTC)

Dear anonymous editor,

Yes, it may be fantastic that Mike can shoot tight groups and that there's more to come. This is an encyclopedia and you should use appropriate phrasing. Until then, it stays out. MikeTango (talk) 21:33, 22 September 2016 (UTC)