Bad results...

[goinghunting]

So was forced to do some load development with virgin 300 wsm...

Got a load that will work for an elk hunt next week, but what are the odds when reloading this now once fired brass I will have to do more development or tweak things?

Any first hand experience with this type of situation?

FWIW this new brass was sized originally to -.002 headspace from what the rifle produces, so I'm hoping reloading this once fired will have similar results as the virgin load.

FL resizing.

Hope to load some tonight and shoot it tomorrow to find out.

 

[Precision Underground]

If they only grow .002 from new it should not make much difference IMO.

 

[ShtrRdy]

Since it's so close I'm going to guess that you'll be alright.

 

[Bradu]

I haven't ever seen a difference from a new case to a fireformed piece unless it's an ackley improved cartridge. I think you will be fine.

 

[spife7980]

I’ve never seen it be the same before as after. I think you’ll need to add a couple tenths. It’s not just length that composes volume, that brass expands in every direction.

 

[Shifty6BR]

Neck tension will most likely be different, die dependant. May see a slight poi shift.

 

[regency]

I always have to go down .1-.3 grains after the brass has been once fired

 

[Sheldon N]

I worked up a 7SAUM load in virgin brass, had to take a couple tenths of a grain of powder out on once fired brass to get it to shoot again and be the same velocity.