Pressure?

[The_Whitetail_kid]

Hello everyone. Need some help here. I have shot 3 loads today at the range, and all three caused some sticky boat lift. I don't feel like the power charge is that high, and I'm not good at telling pressure signs by looking at the bottom of the case. In my 7RM. Thanks

 

[bamban]

What rifle?

 

[The_Whitetail_kid]

7RM

 

[MagnumManiac]

None look over- pressure to me.
Sticky bolt lift can be many things, but the number one thing I see that is most likely causing it is the cratered primers, as the bolt turns it catches the edges which is evidenced within your pics of the brass.

Cheers.

 

[74honker]

Tell us more info. New or fired brass, clean chamber? What is your jump to lands? What gun? I've had some stickers from just a dirty chamber. New brass can do some wierd stuff sometimes. I personally don't see anything jumping out about the brass. A little crater maybe but if your bolt has a smidge bigger firing pin hole that could be where that came from. The primers don't look flat at all. Could also be from way undercharged load. You did say you didn't think it was too high. Anyway, tell us more detail.

 

[FEENIX]

Hello everyone. Need some help here. I have shot 3 loads today at the range, and all three caused some sticky boat lift. I don't feel like the power charge is that high, and I'm not good at telling pressure signs by looking at the bottom of the case. In my 7RM. Thanks

What bullet and weight, powder, and charge? The more pertinent information you can provide, the better.

 

[The_Whitetail_kid]

Tell us more info. New or fired brass, clean chamber? What is your jump to lands? What gun? I've had some stickers from just a dirty chamber. New brass can do some wierd stuff sometimes. I personally don't see anything jumping out about the brass. A little crater maybe but if your bolt has a smidge bigger firing pin hole that could be where that came from. The primers don't look flat at all. Could also be from way undercharged load. You did say you didn't think it was too high. Anyway, tell us more detail.

Sorry for being vague. Fired brass, and clean chamber. Christensen arms ridgeline 7mm rem mag. One load 69 grains h1000 160 accubond. One load 70 grains h1000 with 160 accubond, one is 71.6 grain retumbo, 168 Berger. The bergers were seated 30 thousands off and accubonds 20 thousands off. Not that it matters but the 70 grains h1000 with accubond and 71.6 retumbo both shot half inch groups.
Norma brass, cci 250 primers.

 

[Dmagna]

Sorry for being vague. Fired brass, and clean chamber. Christensen arms ridgeline 7mm rem mag. One load 69 grains h1000 160 accubond. One load 70 grains h1000 with 160 accubond, one is 71.6 grain retumbo, 168 Berger. The bergers were seated 30 thousands off and accubonds 20 thousands off. Not that it matters but the 70 grains h1000 with accubond and 71.6 retumbo both shot half inch groups.
Norma brass, cci 250 primers.

is this a new rifle?

 

[Jester896]

the first 2 pics it looks like the primers still have a rounded edge. The third one is flatter but they all look like they have ejector marks to me

 

[Bob Wright]

I see ejectors on all. Primers are decent actually.

 

[74honker]

I see ejectors on all. Primers are decent actually.

I agree, ejector marks and primers good.

 

[Tiny Tim]

the first 2 pics it looks like the primers still have a rounded edge. The thrird on is flatter but they all look like they have ejectors marks to me

I thought I might see what looks like that too, but it uncannily appears to be in the exact same spot on several pieces.

 

[bamban]

7RM

Not cartridge, what rifle, as in make? Reason I am asking, 3 rifles my friends had, we end up sending the bolt out to fix the primary extraction. They could not run the bolt. They are RR prefix Remington

 

[74honker]

I should clarify, yes ejector marks. Primers look ok. Not primers and ejector marks are good. Sorry I even confused myself lol.