Douhgnut avoidance

[284stak]

Are there any 7mm cartridges/cases that seem less likely to form doughnuts? Have been told the Norma cases are more apt to and wildcat cartridges do as well from the necking down/up.
Am getting close to rebarrelling and after having to deal with doughnut issues in a necked down 330-7 dakota - want to avoid this as much as possible in the future. Am leaning towards a 7WSM.

 

[Overkill338]

Is your choice only for a short action ? If not, why not a 7 STW or 7 RUM, or the tried and true 7mm Rem Mag ?

 

[Mikecr]

A 7WSM is a very good cartridge. It will not stretch(causing donuts) and need to be trimmed as much.

 

[bigngreen]

Using Norma brass in my 270 WSM doughnuts show up in 3 firings, Win and Rem never a problem. My head spacing is a little long but when I tighten it up I may give Norma a try again.

 

[284stak]

A short-action is not my only option - just seems that a 160-180 vld in a 7WSM gives pretty good ballistics. I have a straight feed mag already (HS-Precision DM) that will work nicely. The 7RM would be 2nd ---- currently have no desire for the STW/RUM ---- have noticed that even if they do go faster, a lot of the vld bullets don't shoot as accurately at that higher speed.

 

[Gene]

Usually, necking up causes donught formation inside at bottom of the neck. If the base of your seated bullet will not touch the doughnut, its not an issue.