reloading question

S

sigmatero

Guest
I'm pretty new to reloading, especially wildcats, but I've recently read The Ultimate in Rifle Accuracy and have been inspired to load as accurately as I can.

I'm working on a 338BR aka 338 Whisper (7BR necked up to .338 for use in subsonic application with 300 gr Sierra Matchking). I'm currently building up a single rifle shot for accuracy but later want to use the same cartridge in a AR-15. I'm getting a custom chamber cut so have some flexibility there.

The AR has a max COAL of 2.260 to fit in the magazines. Because the 300 gr SMK is so long, when I insert the bullet to the COAL I'm about 0.09 shy of the ogive tangency so essentially the full diameter portion of the bullet is buried in the neck.

The neck of the cartride is about 0.32 long and I have room to recess the bullet deeper (powder capacity shouldn't be a problem since I'm subsonic).

For accuracy, what is more important- more brass neck or more contact with the throat?

From experience, how short of neck can I get away with and still have a cartridge that isn't too delicate (which could cause feeding problems in the AR).

And from experience how much contact with the throat is typically required?

Thanks folks!
 
me thinks your question belongs else where. probably in factory/hybred rifle or maybe in gunsmith.

mike in co
 
mike in co said:
me thinks your question belongs else where. probably in factory/hybred rifle or maybe in gunsmith.

mike in co
Click to expand...

Yaa, I wasn't quite sure where to put it. It's definitely not a factory rifle nor is it a modification to the rifle itself. I can certainly move the message.

I was figuring that most benchrest shooters are reloading themselves and have played around with the most accurate bullet seating depth and could offer advice about neck length.
 
Kinda a....

sigmatero said:
Yaa, I wasn't quite sure where to put it. It's definitely not a factory rifle nor is it a modification to the rifle itself. I can certainly move the message.

I was figuring that most benchrest shooters are reloading themselves and have played around with the most accurate bullet seating depth and could offer advice about neck length.
Click to expand...

Kinda a broad question for most guys on this part of the forum who shoot mostly 6ppc, 6BR, 30BR, 30/44, and 30/47 with custom benchrest rifles. We're kinda limited to this field. However, there are probably many folks in the "factory/hybrid" and "1000yd benchrest" on this forum who may have better information for you.;)

good luck...virg
 
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