Touching the lands

[wizzum]

Any pictures of shot targets. Just trying to get an idea of what sorta thing your seeing.[/quote]

i will check. If not i hope to punch some holes this weekend weater permitting

 

[Ridgerunner665]

Trying to post picture

OK... I don't think that's rifling marks.

Is this a 3 or 4 groove barrel? A 3 groove might have lands that wide.... Maybe.

Kreiger...think it is a 5 groove...

Have you tried dropping a round directly into the chamber and closing the bolt (not feeding from the mag)...if so, does it have that same mark on it?

 

[wizzum]

Yes, That is exactly how I did it with the one in the picture.

 

[Ridgerunner665]

I'd see if I could find a local smith with a bore scope and have a look at it...best advice I can offer.

 

[cloverleaf]

I don't have a lot of experience here.... but is it possible that the bullet run out is excessive? I have had once fired brass, point my bullets in all kinds of directions. The culprit (I think) is a bolt face that isn't square with the chamber. Is it new brass? Dies off square some how? Not to muddy the waters.....CL

 

[Ridgerunner665]

I don't have a lot of experience here.... but is it possible that the bullet run out is excessive? I have had once fired brass, point my bullets in all kinds of directions. The culprit (I think) is a bolt face that isn't square with the chamber. Is it new brass? Dies off square some how? Not to muddy the waters.....CL

Excellent suggestion!!!

I didn't even think about it from that direction...makes sense though.

 

[SJB358]

Trying to post picture

I would get it checked out. Doesn't look correct to me. Seems like something is off kilter.


Is that the only mark on the bullet?

 

[wizzum]

I don't have a lot of experience here.... but is it possible that the bullet run out is excessive? I have had once fired brass, point my bullets in all kinds of directions. The culprit (I think) is a bolt face that isn't square with the chamber. Is it new brass? Dies off square some how? Not to muddy the waters.....CL

Great points! Could be some run out and I need to get a gauge to check that. Something is not right. The mark has shown up on the loads(new brass from Builder) as well as the stuff I have worked up-new and once fired. Nosler Brass.

 

[wizzum]

RR665 and SJB- I will have the builder check it out. I am trying to evolve from the hunting game into the accuracy game. Lots of to learn and understand. One of the first things I learned is that this is akin to digging a nice size hole that you will eventually fill up with money.
Thanks for everyone's help/thoughts! Great site with great info!

 

[cloverleaf]

I don't have a lot of experience here.... but is it possible that the bullet run out is excessive? I have had once fired brass, point my bullets in all kinds of directions. The culprit (I think) is a bolt face that isn't square with the chamber. Is it new brass? Dies off square some how? Not to muddy the waters.....CL

Great points! Could be some run out and I need to get a gauge to check that. Something is not right. The mark has shown up on the loads(new brass from Builder) as well as the stuff I have worked up-new and once fired. Nosler Brass.

There Might be a poor mans way to check for "off" center seated bullets... Can you take a bullet that has the marks on one side and get it back into the action, rotated 180 degrees. If you have marks on the opposite side maybe that helps confirm it. Maybe not...CL

 

[wizzum]

CL-I will try that. I know I have put the same round in the gun numerous times but have not made sure it was rotated around to see if the mark would move. So far the mark is the same size and I think in the same location. Will have more time this weekend.

 

[257 Ackley]

Load a dummy round and place an orientation mark on the neck of the case. Chamber the round with the orientation mark facing out towards the ejection port. When you extract the round, note where the mark is on the bullet in relation to the orientation mark you made. Try this a few times and see if it is always in the same place. My guess, based on the location of the mark is that there is a burr (rough edge) on the lead of one side of the chamber. That will make the bullet unstable when jumping into the rifling and cause unacceptable groups. A bore scope should tell you if this is the case as well.

 

[BeeTee]

Trying to post picture

The mark on the bullet may be nothing. I didn't see where you posted what brand of rifle this is, but many of them use an ejector that exerts pressure on one side of the brass case, so the spent cartridge will pop out of the loading window when the bolt is moved rearward.

This side pressure on the brass case can cause the mark seen in the posted image as the bullet is dragged across some portion of the chamber - probably during extraction. That mark is not due to rifling lands.

 

[wizzum]

BeeTee--I am told it is an ejector mark. Stiller Predator Action