Ejector marks

[dustbag]

My buddy bought 6 dasher, Rem 40x action. 105 Berger vld hunter. Ran pressure test starting 31.8 varget at around 2850 up to 33.6 at 3050 ish. This box of 50 was 32.3-32.7 2900-2990. Wondering why ejector marks. No near where pressured out on test. Peterson brass. Was discussed on a different thread that firing pin should be bushed as well. Primer strikes are inconsistent.

 

[wldcat]

Has to be pressure, I don't have any experience with the dasher but my 6br only runs 31.3 varget with an 80grain pill….. it is a light load but the 80 grain Bergers shoot in the zeros at 2970 I don't remember where I pressured out but it wasn't near 33.6..

 

[Rosebud]

Some of the ones in the box appear to have the primer pirced. Or am I not seeing them correctly?

 

[BW64]

My 6br runs those at 30.3 & dam close to one hole. In my opinion that's high pressure swipes. But I never went above 30.5 so I may be wrong. Also I tried Peterson brass in 6.5 & found them to be thicker & had to dial down my load but great brass.

 

[dustbag]

First 50 shots with pressure testing had a couple that looked dark pierced? This last 50 had multiple and at lower charges. He's gonna take to a smith tomorrow to have firing pin looked at. I have a 6 dasher I run at 32.7 with virgin alpha brass and now 32.4 after fired at 2960 no issues. I know different guns different loads but seems too light for ejector marks.

 

[dustbag]

My 6br runs those at 30.3 & dam close to one hole. In my opinion that's high pressure swipes. But I never went above 30.5 so I may be wrong. Also I tried Peterson brass in 6.5 & found them to be thicker & had to dial down my load but great brass.

What speed do you run your BR. We are new to these types and all the reading says between 2925 and 2975 is where we want to be with a 105

 

[BW64]

2875 is great in my Rem 700 26" tube & works well out to 1100

 

[MagnumManiac]

Looking at the fired brass, that is NOT a mechanical fault with the rifle. STOP!
Those are way over safe pressure. If you look at the cases that have the huge riveted look, that is way over what those primers, and firing pin spring, are manufactured for.
A broken firing pin spring is very near, or has already popped, and will cause all sorts of issues. Those pierced primer pieces just don't disappear…they end up inside the bolt body.

Cheers.

 

[Bang4theBuck]

My buddy bought 6 dasher, Rem 40x action. 105 Berger vld hunter. Ran pressure test starting 31.8 varget at around 2850 up to 33.6 at 3050 ish. This box of 50 was 32.3-32.7 2900-2990. Wondering why ejector marks. No near where pressured out on test. Peterson brass. Was discussed on a different thread that firing pin should be bushed as well. Primer strikes are inconsistent.
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What barrel length? Anything above 2900 with a Dasher and 105 could start to get hot. I hit pressure at 32.3 on my dasher, which yielded 2920 in a 25" barrel. If you read the blogs anytime guys on the prs series push near 3000 they start getting pressure signs and low brass life. I'm not sure I would be too surprised with your results.

 

[lejuch]

Your loads are above safe pressures for some reason, based on appearance of brass. STOP! To prevent bad things from happening to you, your friend, or the gun…..the source of pressure needs to be rectified. Powder load, brass, throat, bore, gun function,…..these and possibly more potential problems need to be verified prior to shooting gun again. Be safe!

 

[BillLarson]

If your fire forming brass... seat bullet into lands...
1)Brass not sized for chamber.
2) bush firing pin hole or it,ll ruin your bolt...

 

[25WSM]

Multiple things can cause what Im seeing there. Of course the main one being too much pressure but im not so sure thats the issue here. Primers are very rounded on the edges. Usually when the pressure is getting up those primers start to get flat and I see zero flat primers. Other causes of the issues I see are case lube still on cases. Headspace too short on the brass. Too light of a firing pin spring. And yes I would absolutely bush that bolt face to a .062 pin size. I would look into running cci 450s also. They have thicker cups and hold pressure better than most SR primers. And yes 3000 fps from a dasher with 105 class is pushing it. Sweet spot is near 2950. And yes as some have said every gun is different. Listen to your gun on individual basis it wont lie to you.
Shep

 

[Chas1]

Your loads are above safe pressures for some reason, based on appearance of brass. STOP! To prevent bad things from happening to you, your friend, or the gun…..the source of pressure needs to be rectified. Powder load, brass, throat, bore, gun function,…..these and possibly more potential problems need to be verified prior to shooting gun again. Be safe!

Lejuch is right, your over pressure and should stop until you figure out the source.

 

[esshup]

Tell your buddy to stop and do NOT fire any more of those loads. That is a VERY high pressure sign and he could blow up the gun hurting himself and anybody standing close. The brass on the base is starting to flow into the ejector/extractor cut out in the bolt face. That brass is ruined - I bet that if he measures the OD of the case right above the base of the cartridge he will see that it is swelled and resizing will not fix it.

It doesn't matter what the "book" says, each gun is different. Bullet is jammed into the lands, he didn't remove the sizing lube from the cases before they were fired, that particular lot of powder could be "hot", etc., etc.