Ejection issue

F

Freebore1

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I'm usually over on another forum but have not recieved any replys to my post on this issue hoping you folks here could help me. I'm mainly a hunter with a few customs.

I recently rebarreled a BLR81 (lever action Browning) with a Krieger barrel 21" in 7mm-08. My issue is that Norma, Rem, W-W brass is very hard to eject with loadings of 46gr of H4350 w/145 Speer sptz. velocity is 2675fps

Now when I went to some nickel plated Fed brass I have NO ejection issues even at 47 grains. Primers are not flattened. Velocity is 2750fps
The chamber was originally finished w/320. Thinking it was bolt thrust we repolished to 220 grit. No change, unplated brass still 'sticks'.

Thoughts on what could be the difference on brass. My 'smith said 'good thing you had some nickeled brass on hand'
 
Two things - -

How does it shoot? and there is a Gunsmith Topic forum here where you might also ask the question in an effort to get answers.
 
Different makes of brass may be harder or softer and react as you have seen. This is slightly exaggerated by the poor initial extraction camming strength of the action design. Those are just my thoughts...
 
Nickel brass

The rifle shoots well<1/2" at 100 just trying to get a load that works. Trying now to tune the nickel brass loads. I just find it hard that there is such an extraction issue between the brass. The unplated also shows slight pressure signs at the lower loadings.

I guess I'm stuck shooting nickel brass. Haven't tried 'factory fodder'. Can't bear the budget impact!! :eek:

I was just hoping somebody had an issue such as this to share.
 
I developed a load for a Browning.....

A-Bolt, in .338, that thumper would shoot anything EXCEPT nickle brass!!!

Go figure.;)
 
Naaahhhh, John, the first one.........

would extract & eject okay, the next would be a little sticky, & you'd have to horse it open, the next one you'd have to get somebody to hold it while you tapped it open w/a chunk of wood. Regular (UNplated) brass, EVERYone would fire, extract & eject, no problem, & the load wasn't anywhere NEAR max!!;):rolleyes:
 
Jon may be on to it..

different brands and types of brass are all different, both , dimensionally and metalurgically ...what works in one "plain or battered" may not work in the other....sounds like you shuld use the "shiney" ones....Roger
 
What I meant by case capacity is that different brands of cases have slightly different capacities. Another thing, plated brass is slicker so would extract easier. Max loads for a 7-08 are most likely worked up in a bolt action which are stronger than a BLR. I would drop a grain or two and see what happens. My 2 cents
 
Sticky Brass

A new barrel with a new chamber deserves new brass.If the brass you are using was used in the old barrel. TOSS IT. RANDY
 
Nickel brass for sure..so far

Just to bring everyone who has responded up to speed, I just shot a < 1/2" (.428) group using the Fed. nickel brass, WW-760 47.5, CCI-250, Speer 145 Sptzr just touch lands, velocity was 2830fps. This is what I wanted and expected from this barrel. No issues. I have loaded 10 to take take to the range for confirmation.

I had been shooting 49.0 of 760 in the factory barrel for 2785-2800

I know Krieger builds a heck of barrel. Is it possible that due to the cryo treating (this is a carbon steel barrel) that it has taken close to 200 rounds for that barrel to 'come in'. The cryo selling point is that it make things live longer due to the molecular structure uniformity via crystalline laying in the correct position after cryo treating. Just wondering if anyone has experienced this possible issue with a carbon steel barrel. I'm thinking this barrel may be 'harder' not from a rockwell point of measure but from a machining layer that I have finally broke thru.

I will try the Norma brass again after the confirmatory loads provide data. I am satisfied with the nickel performance now.

Just something about shooting nickel brass I don't like. What about annealing? I do anneal after 4-5 firings as I've had neck splitting issues just like the .243.

Thank you for your time.
 
The chronograph tells the story. Right now, with 1.5grs less powder, your getting more velocity. Hard extraction and split necks are usually from a load that is too hot. A lever action just doesnt have the extraction capabilities of a bolt action, so if it is anywhere near a warm load it will cause problems.

The new barrel is undoubtably machine to closer tolerances in the chamber, throat, and certainly in the bore. It makes better use of the powder, contains the pressure better, and gives much higher velocity and the brass wont take it. If you turn the load down and work back up with the chrono, it will probably shoot even better and eject the rounds without a problem.

Cryo treating isnt a surface hardening process, so there is no "machining layer" to break through.
 
:rolleyes: I think you got that backwards. He's got 1.5grns more powder, more velocity and good extraction with nickel plated brass.

Hovis
 
?

Guys I'm sorry if I confused the subject by mentioning splitting neck. What I was refering to is that after 4 or 5 firing my .243 along with my PREVIOUS barrel in 7mm-08 the necks started to split on few. It was at 4 firings I would anneal and still do.

So has anyone ever annealed nickel or does this neck splitting not become an issue in nickel brass?

I have never shot nickel brass enough times ever to get there in any cartridge as I usually use Norma/Lapua/Rem/WW unplated.

I would think,,, it would be time to purchase new brass.

So the rifle is really doing what I wanted after the re-barreling job, I just have to use nickel brass. If the extraction issue still exist I won't know until I try the Norma brass again AFTER the nickel load is confirmed. 47.5 of 760 is perfect in the rifle. 49.0 was the old factory barrel load and I don't need to go there.
 
Plated brass seems to be more brittle and the necks will split sooner than unplated. Annealing might be worth a try. We have a weekly cast bullet match and shoot the same cases over and over unplated seem to last forever but plated start splitting after a while. Jon
 
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