rifling marks on one side?

jesse1004

Well-Known Member
Joined
Jan 24, 2010
Messages
56
im loading for a .243 and trying to load with the bullet seated into the lands. I notice that if i eject the round out there is only marks about 1/3 around the bullet. is this normal or are my bullts not being seated straight?
 

rdd

Member
Joined
Jan 11, 2005
Messages
5
Location
South Dakota
Most likely you are not seeing rifling marks, but instead when you open your bolt to eject the loaded casing, the bullet is being scraped along the side of the chamber and that is why you are only seeing marks on one side of the bullet.
 

Innovative

Well-Known Member
Joined
Mar 18, 2002
Messages
215
Location
Casselberry, FL
jesse1004 .......

Try using a case like this. I make a sample round (with a slotted neck) to hold the bullet, and I use it like you described to locate the rifling. The chamber pushes the bullet back when it contacts the rifling.

OAL-3.jpg

After carefully extracting the sample round, I set it on our Digital Headspace Gauge. It's designed to locate chamber clearance (at the shoulder), but it can also measure your bullet "jump" to the rifling.
OALPIC.jpg

Just "zero" the gauge, and it's calibrated to your rifle. When you set your handloads on the gauge, it displays how far behind the rifling your bullet is seated. This example shows the bullet is seated -.002" behind the rifling.

- Innovative



 

royinidaho

Well-Known Member
Joined
Jan 20, 2004
Messages
8,950
Location
Blackfoot, Idaho
When you extract the cartridge stick you finger in there and keep the cartridge straight so as to not rub the side of the bullet while extraction.

With the above shown slotted neck which is one of the better things a person can do the rifling/leade marks will be accurate and show up well.
 

winmag

Well-Known Member
Joined
Dec 23, 2009
Messages
2,529
Location
LaPine Or.
Have you tried using a candle to ''smoke mark'' your bullett before pushing it tight to the lands? Sometimes its easier to see the shiny marks thru the soot. But like the others posted, your marks are probably from extraction.
 

MagnumManiac

Well-Known Member
Joined
Feb 25, 2008
Messages
2,968
The explanation you're looking for is simple if your rifle is of the plunger ejector style. While extracting the round, the ejector forces the bullet hard into the rifling on one side only, if, as stated by royinidaho, you push your finger on the round keeping it square as you extract it, it should show up all the way around the bullet.

I smoke my bullets so the rifling shows up easily, but I doubt you're getting full contact with the rifling if it's only showing up on one side.
It should be the same depth all the way around the bullet if you're getting full contact.
gun)
 

Kevin Thomas

Well-Known Member
Joined
Feb 16, 2009
Messages
1,256
Location
Sedalia, MO
I've got another explanation that you might want to take a look at, but hopefully this isn't the answer; the chamber is reamed off axis with the bore/barrel. I've seen this before in factory chambered rifles, really badly in one case, involving five (5) separate rifles that came off the same run. These had rifling that extended all the way to the chamber mouth on one side of the barrel. Rotate the bore scope 180 degrees, and the rifling stopped so far up the throat that they looked like Weatherby's with extra freebore. Naturally, the only way any of these were ever going to be tackdrivers was to grab them by the barrel and start using them as a hammer. I doubt, that's the issue here, but I have seen it, and it IS a possibility. Worth taking a look . . .

Kevin Thomas
Lapua USA
 

jesse1004

Well-Known Member
Joined
Jan 24, 2010
Messages
56
i did the smoke on the bullet trick and found out it is just from ejecting. i have hornady's oal guage so couldn't quite figure what was going on. thanks for all the replies.
 

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