question on neck tension (sizing)

[janobles14]

will accuracy be greatly affected from round to round if the amount of neck sizing is different? example...i loaded some .30-06 rounds and only sized the neck enough to hold the bullet since the shoulders didnt need pushing back. then on the other half of the rounds i sized the neck about half way (you can see the sizing "ring"). will these two rounds shoot that much differently?

 

[Borg]

Yes, it will.
When you say neck sized, dod you mean not sizing all the way down with a FL sizer?
If you did,, you'd better check to see if they will chamber in your rifle all the way,, most times they won't.

 

[Walkalong]

Neck tension can affect powder burn, which will affect velocity and or accuracy. Consistency, once you find the right combo, is the name of the game for accuracy.

 

[rcmodel]

enough to hold the bullet
then on the other half of the rounds i sized the neck about half way

In either case you didn't really do what is considered neck sizing.

You at least need to size the neck the equilvient of one bullet caliber.
But to truly do it right, do it almost to the shoulder.

rcmodel

 

[janobles14]

size the neck the equilvient of one bullet caliber

what does this mean exactly?

 

[243winxb]

what does this mean exactly?

bullet diameter is .308". This means the neck should be sized down from the mouth that much to hold the bullet. It just a general rule some use.

 

[243winxb]

will these two rounds shoot that much differently

The cases sized half way may give better accuracy because the unsized part of the neck helps center the round in the chamber. If you are using a flrs die and the die touches the case body, the round may not chamber in your rifle. Using a flrs die in this manner works only with cases that have a large body taper.

 

[janobles14]

gotcha. i am using a fl die right now but have a neck size on order. i checked and all of the rounds mentioned chamber fine.