Ok so I got a set of reddings type S bushing dies for SAAMI 280 AI (I'm using nosler brass). I measured it right at the mouth and got .309, just a touch below that was .308, and it was the same for 2 cartridges (I'm measuring some of nosler a custom competition 150gr E-tip ammo). So should I just get a .307, .306, or both? What are you guys using? Thanks!
Redding Type S Bushing 280 AI help!
- Thread starter stanley52
- Start date
I use the .309 with my set up. I run Nosler brass and Redding dies as well.
In order to determine correct bushing size, it is my understanding that you need to measure a case neck with the bullet you I tend to shoot seated, then subtract .001-.002. I went ahead and bought the .309 and .308 bushings and haven't had much luck with the .308. Good luck.
In order to determine correct bushing size, it is my understanding that you need to measure a case neck with the bullet you I tend to shoot seated, then subtract .001-.002. I went ahead and bought the .309 and .308 bushings and haven't had much luck with the .308. Good luck.
I have a range of different bushings so I can adjust for neck wall thickness and neck tension. Another method for determining neck bushing size is to multiply the neck wall thickness by 2 add the bullet diameter then subtract the desired tension. This is the method I use and requires a ball micrometer to measure neck wall thickness.
I use a .311" But, I didn't go off the handle when turning down. Just enough to make a clean swipe all the way down the neck. I think I only took off .002"?
For Nosler 280 AI brass, the neck thickness is .013 and a loaded round measures .310 so you want a .308 or .309 bushing. For Norma 280 brass that has been fire formed to 280 AI the neck thickness is closer to .014 so you want a .310 or so bushing for that. I personally go with .002 tension and use a .308 for Nosler and .310 for Norma. Over time the necks will thin a little and the bushing that was putting .002 tension will continue to work.
