Optimal Bullet Placement in Case?

[DoneNOut]

If the jump to lands worked out fine for either placement, which of the two pics would be the better placement of the bullet in regards to bearing surface? Pic #1 or Pic #2: (Black line shows bottom bearing surface location)

1: .150" of .308 cal bullet into neck

Pic #2: .308" of .308 cal bullet into neck

 

[std7mag]

Depends.
For shooting a match, i'd be ok with the first one, possibly seeing if i could squeeze a few more grains of powder in for that touch of velocity.

For hunting, i'd prefer the second. Guns & ammo get bumped around more. The slight increase on bearing surface would give me more piece of mind.

 

[DoneNOut]

Depends.
For shooting a match, i'd be ok with the first one, possibly seeing if i could squeeze a few more grains of powder in for that touch of velocity.

For hunting, i'd prefer the second. Guns & ammo get bumped around more. The slight increase on bearing surface would give me more piece of mind.

I have always gone for pic 2, but getting into F-class FTR. First go at match stuffs...

 

[lancetkenyon]

I have found that usually the base of the bullet at the body/shoulder junction is a good sweet spot. My vote to try first would be pic#2.

But here is the caveat. I have found most rifles like .020-.050" jump as a sweet spot also. While you can find another sweet spot seated deeper, that range of jump distance is usually a good gamble.

Then there is max mag length and feeding reliability to think about.

I guess what I am saying after reading my own post...there is no "one-size fits all".

Accuracy Above All.

 

[Seabeeken]

Id go with whichever shoots best. Id also trim case #2 to square up that neck. Quite crooked

 

[Varmint Hunter]

Neither - one has too little bearing surface in the neck and the other is a bit too deep to avoid any possible donut that may develop in the neck.

 

[DoneNOut]

Id go with whichever shoots best. Id also trim case #2 to square up that neck. Quite crooked

That's funny, I noticed that too. I inspected it and it's square. The camera lens distorted it.

 

[DoneNOut]

Neither - one has too little bearing surface in the neck and the other is a bit too deep to avoid any possible donut that may develop in the neck.

Can you elaborate on this donut thing please. I've read that one should be a caliber size deep in the case to 1/2 cal size length. SO for 308 it's .308 of bearing surface in the case. .150" for half...

 

[L.Sherm]

I would go with #2 theres something to be said about a bullet having more neck around the bearing surface for accuracy if thats your main goal which is what I would be after. IE. BR and PPC case.

 

[L.Sherm]

Move the bullet forward about .020 on #2 and you will probably be out of the potential donut area which can occur at the neck shoulder junction especially on necked up cases.

 

[L.Sherm]

As cases are shot the thicker shoulder area gets pushed into the neck which can create a " donut"

 

[DoneNOut]

As cases are shot the thicker shoulder area gets pushed into the neck which can create a " donut"

I've heard of this, but I have never seen it.

 

[L.Sherm]

Its alot more common on necked up stuff because you transition some of the shoulder to part of the neck.
I have never experienced it necking down

 

[L.Sherm]

In my opinion its one reason I like bushing dies also they dont size all the way down to the neck shoulder junction