Anyone forming their own .300wm brass

[joe0121]

I am getting some pretty sever soot on the case necks with my .300 even with several factory loads. I was kicking around the idea of forming my brass from on of the win mags parent case then minimally trimming the neck so it barely fits in the chamber. This would also allow to to neck turn and still keep the brass pretty think to increase neck tension.

 

[Bart B]

Use a different powder that's cleaner. You need plenty of neck clearance for best accuracy. IMR4350's a good choice for bullets 165 through 220 grains.

Your barrel may have a chamber or bore dimensional issue; I'd have them checked.

 

[joe0121]

Use a different powder that's cleaner. You need plenty of neck clearance for best accuracy. IMR4350's a good choice for bullets 165 through 220 grains.

Your barrel may have a chamber or bore dimensional issue; I'd have them checked.

Interesting indeed. I have had great luck with h1000 but even a few different brands of factory powder exhibit this. I don't really have a smith nearby to do it ill have to send it to someone.

 

[7stw]

Interesting indeed. I have had great luck with h1000 but even a few different brands of factory powder exhibit this. I don't really have a smith nearby to do it ill have to send it to someone.

I have to agree with Bart. Typically when you get case neck " sooting"' that usually means powder is to slow, and is not sealing the neck when fired. It also could be that the case neck area is extra generous. The best you can do, it use the faster burning powder, ie, 4350' or IMR 4831. Both of them typically burn clean, and quick enough to seal the necks,without spiking pressures. Sometimes, you can not get rid of it totally, but it can be minimized by powder selection, and common sense. Take care, and be careful. I would not bother with the fire forming thing. To much hassle, with to little gain, if any!

 

[joe0121]

I have to agree with Bart. Typically when you get case neck " sooting"' that usually means powder is to slow, and is not sealing the neck when fired. It also could be that the case neck area is extra generous. The best you can do, it use the faster burning powder, ie, 4350' or IMR 4831. Both of them typically burn clean, and quick enough to seal the necks,without spiking pressures. Sometimes, you can not get rid of it totally, but it can be minimized by powder selection, and common sense. Take care, and be careful. I would not bother with the fire forming thing. To much hassle, with to little gain, if any!

Thanks for the input Ill pick up some 4831 and see how I like it.