243 AI - Do I need to be inside neck reaming?

[rchouser]

I just had a new 243 AI barrel installed on my rifle. I am fire-forming my brass by loading factory or home-built full house .243 loads into the rifle and just shoot them. I then reload the fire-forms with my favorite brew and use them for shooting.

I recently was asked if I was inside reaming the necks for the "donut" that would be created by the fire-forming. HELP?

In the early 80's I was shooting an Ackley Improved 22-250 and I swear all I did was to fire-form, case trim when needed and shoot the brass.

I used neck reaming when I was necking down 270 into 6 rem brass. When I was bench shooting a 6 x 47 (222 mag necked up to 6mm), I would turn the brass necks to fit my tight neck chamber and then use an arbor for reloading.

I have used a paper clip to try to feel any donut and swear I don't feel anything formed.

Am I at risk for not neck reaming 243 AI brass after fire-forming?

thanks rch

 

[DJSBRS]

Will a bullet drop back in the fired neck after firing? If so, don't worry about it. If your bullet bearing surface does not go below the neck shoulder junction, don't worry about it.

DJ

 

[rchouser]

It drops right in past the neck and shoulders. thanks rch

 

[LHSmith]

^^^^^ In that case, don't worry about it.....and you won't feel a donut with a paper clip.