Pressure sign and 300wm load

[bobcat]

I wouldn't put too much credence in what your primers look like. It's really not a good way to determine pressure in your loads. If your bolt is opening normally and your velocity isn't abnormally high, then you should be fine.

[92xj]

3015fps for a 200 gr round is hauling the mail, but I don't think it's excessively fast for the gun.
Bolt opens great, new trigger is tits and the gun feels great.

[BULLBLASTER]

Was that new brass on this firing?

[92xj]

Was that new brass on this firing?

Yeah

[BULLBLASTER]

Was that new brass on this firing?

Yeah

I don’t think you are doing anything that is over the top dangerous or anything but you may see more pressure signs on future firings at that same load. I experienced it with my nosler brass in 300. Virgin brass would shoot 80 ishFPS faster without pressure signs than once or twice fired.

I also don’t know what is the expected velocity with this bullets either tho.

If it’s working for the time being and you have brought to get you through your bear hunts I’d go ahead and use it.

[92xj]

Roger that,
I have about 70 more virgin cases and 30 more 199gr sledge hammers.
I plan to load the 30 more, which should get me through 20 rounds of testing and 10 rounds to have during bear season.
Once Bear season is over, I am thinking about playing with the 199 or 214 hammer hunters for 1k yard shots and find a load with them for montana deer.
it's never ending...

[BULLBLASTER]

 

[rudysts]

I heard Bertram brass is pretty thick have you weighed them and compared them to other brands like Norma or Nosler.
heavier usually means thicker brass which decreases volume. less volume can equal more pressure with less powder especially if seated deep in the case.

[TheArmoredShop]

At what point during your inspection do you say, yep, that's too much pressure not load any more powder?
Is it the first sign of flattened primer?
Is it when your finished comes apart and you see your armbflyimg through the air?

Thoughts on pressure signs before reaching the manufacturers max powder charge?

300wm, Bertam, H1000 75gr, 199sledge hammer, .024 off lands, crunching powder when seating, 3015fps, sd5, es10. .75 group.

Going to repeat this load and hopefully repeat the grouping and if so, I'll call that load a win for my hunting rifle and be very satisfied.

The other part of me wants to keep going up to the 79gr max but crunching at 75 and also the primer flattening a frog nut hair has me holding up on that thought.

When your primers start pushing out of the case after being fired. Great indication you’re running hot


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[92xj]

How exactly is a primer flattened? Pushed out to the bolt face? Just expanded in the primer pocket?
 I still have normal resistance when extracting these primers.
The gun has shot 20 of these rounds and still no hard bolt lift at all, gun hasn't come apart and still shooting great groups. I still plan to run this load for spring bear unless someone that is known to be trustworthy on here tells me at any point the gun will come apart or I will die.

[BULLBLASTER]

How exactly is a primer flattened? Pushed out to the bolt face? Just expanded in the primer pocket?
 I still have normal resistance when extracting these primers.
The gun has shot 20 of these rounds and still no hard bolt lift at all, gun hasn't come apart and still shooting great groups. I still plan to run this load for spring bear unless someone that is known to be trustworthy on here tells me at any point the gun will come apart or I will die.

The only way to know if the primer pockets are loosening from overpressure is either they blow out when you shoot or the case just not hold a new primer. If there a bit loose going in next time maybe drop it a bit but that would just affect brass life. 

[92xj]

How exactly is a primer flattened? Pushed out to the bolt face? Just expanded in the primer pocket?
 I still have normal resistance when extracting these primers.
The gun has shot 20 of these rounds and still no hard bolt lift at all, gun hasn't come apart and still shooting great groups. I still plan to run this load for spring bear unless someone that is known to be trustworthy on here tells me at any point the gun will come apart or I will die.

The only way to know if the primer pockets are loosening from overpressure is either they blow out when you shoot or the case just not hold a new primer. If there a bit loose going in next time maybe drop it a bit but that would just affect brass life. 

Roger that.
I'll install a new primer in the tumbled brass and see what she feels like

[jasnt]

The times I’ve blown a primer pocket out it often leaks the shot before. Now if I see primer blow by I just toss it.
This peace of brass was killed by seeing how fast I could push the 105 gr vld and at 3380fps the primer fell out on ejection but you can clearly see the black around the primer pocket.  If you see any carbon around the primer while still in the brass it’s a kull in my book and time to lower the charge

[yorketransport]

The times I’ve blown a primer pocket out it often leaks the shot before. Now if I see primer blow by I just toss it.
This peace of brass was killed by seeing how fast I could push the 105 gr vld and at 3380fps the primer fell out on ejection but you can clearly see the black around the primer pocket.  If you see any carbon around the primer while still in the brass it’s a kull in my book and time to lower the charge

Just squeeze a little super glue in there with the next primer and you're good to go.

[92xj]

Got the hammer hunters in today and got a few max measurements hitting the lands.

Sledge hammers measurements
With comparator  2.9215
Without 3.420

Hammer hunters
With comparator 2.936
Without 3.619