Verminator2
Active member
Hey all,
I've been working out a load for a new .260 Remington and have been getting somewhat erratic accuracy. A lot of loads couldn't be proven more than once and quite a few flyers. I think the problem is partially having a picky rifle, but while I was fiddling around with some brass I noticed that a bullet won't freely slide through the case neck. Some hang up just a little, while others take quite a bit of force to make it past that neck/shoulder junction. From what I can tell, this is a sign that donuts are forming inside the case neck. Unfortunately, I don't have any pin gauges or concentricity gauges to play with and check this.
The brass is Lapua .260 on its 5th firing. After firing, I run the cases through a Lee Collet neck sizer, and then again through a Redding competition body sizer to bump the shoulders back about 1-2 thou's.
I've tried looking online for information on how to prevent and remove the donut, but I'm having a hard time making sense of it all. I don't have any neck turning tools either. My questions would be is there a particular reason why donuts are forming even though I'm not necking up/down brass? What do I need to buy to remove the current donuts? What should I do to prevent donuts from forming?
Any advice is appreciated! Thanks,
Ben
I've been working out a load for a new .260 Remington and have been getting somewhat erratic accuracy. A lot of loads couldn't be proven more than once and quite a few flyers. I think the problem is partially having a picky rifle, but while I was fiddling around with some brass I noticed that a bullet won't freely slide through the case neck. Some hang up just a little, while others take quite a bit of force to make it past that neck/shoulder junction. From what I can tell, this is a sign that donuts are forming inside the case neck. Unfortunately, I don't have any pin gauges or concentricity gauges to play with and check this.
The brass is Lapua .260 on its 5th firing. After firing, I run the cases through a Lee Collet neck sizer, and then again through a Redding competition body sizer to bump the shoulders back about 1-2 thou's.
I've tried looking online for information on how to prevent and remove the donut, but I'm having a hard time making sense of it all. I don't have any neck turning tools either. My questions would be is there a particular reason why donuts are forming even though I'm not necking up/down brass? What do I need to buy to remove the current donuts? What should I do to prevent donuts from forming?
Any advice is appreciated! Thanks,
Ben