In mine I load up some loads about 2-3 grains under max for the standard .375 and go to it. The cases are fully formed and the fireforming load can give you some pretty good practice shooting from the various positions. JMHO.

Pete,

You can use regular 375 H&H loads to fireform your brass, just as well as you can use UNIQUE.

I think you will find that you need at least 17 grains for that case to form well. This depends on the hardness of the brass you will be using.

Also, here is a trick you can try to help your brass last more than a couple fo firings.

In my experience, all the rifles chambered for the belted magnums have their chambers cut rather generously.

This tends to work the brass quite a bit, and soon you will find that you have to throw them away after only 3-4 firings.

Open up the case necks with an expander, so when you seat your bullets for the fire forming loads they should not be very tight. Seat the bullet out far enough to engage the rifling, hence pushing the case head against the bolt face.

Once your cases are fire formed, I suggest you back out the sizing die, so it only partially size the cases.

You might need to do a full lenth sizing every now and then, but you will find that your brass last much longer.

Saeed,

Thanks for the hints. I intend to archive this thread for future use.

As I said above, fire forming is new to me.


Pete

I second that.

In my 375 Wea I have used 70grs of VV- N-140 behind a 250 gr sierra. Nice practice round and gives you perfect brass from the first bang.