Thread: .223 for the Roar

Originally Posted by Flyblown

Righto. I'm using ADI 2208, a tad above the max book load. I took it to the point of a slight ejector swipe on the cartridge head and then backed off a touch. ADI brass, bullet seated longer than book specs.

Attachment 193468

When I shot the drop tests, with a 100m zero I was seeing a lot less drop at 200m and 300m that I expected. So I ended up increasing the velocity to 3133fps but I also changed the BC to 0.241 from the published 0.214, which I thought might have been a typo. This is what I asked Speer about but the tech there wasn't convinced. However I remember looking at a couple of other bullets like the Sierra equivalent and they were more like 0.24 so that's what I selected.

Works for me. Dead on at 300m, smoke-a-goat.

...you've got a 16 inch barrel? I cant get anywhere near those velocities with 2208 and my 20 inch barrel. You must have a tighter chamber or bore. With 26 grains of 2208 I get 2784fps. I can get 27.5 grains flush with the top of the case mouth and then I have to heavily compress it, which is doable but it was creeping out a bit later....so I took them apart again. And this is with .223 brass, not the ex mil ADI stuff, (which I understood has less capacity?)
Whats your charge weight for the 3133 fps ?