How many firings?
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How many firings do you think you can get out of hornady 6.5 Creedmoor brass with a 44.7gr charge of H4350 pushing a 140VLD at 2930fps?
What do you think will fail and when?
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I'm going to guess the primer pockets are going to open up after 6 to the point they wont hold. But then again that's a wild guess.
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I say 3 and the primer pockets start to fail.
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I say 1.
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2-3
Primer pockets
And if you ignore those signs you’ll have a case head separation around 4-5 firings depending on how you’re sizing.
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Well at an even 44 I could only get 4 on my current lot. So 4 it is.
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So far I have 7 on mine. My loads until recently were with 45.2gn of H4350. Out of 100 cases I've had to throw away 9 for different issues. I didn't count how many for primer pocket issues, but the issues I had were case head separation when sizing, primers falling out of pockets, and very small cracks in the case necks, which I noticed when annealing. I'll continue to use them, but I am keeping a closer eye on the cases now and any sign of anything I don't like, I toss them. I figure I'll give them another couple of firings and then I'll probably toss the lot.
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said:
45.2gn of H4350.
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@orkan said:
said:
45.2gn of H4350.
Hahahahaha....just doing my part to burn that Savage barrel to replace it with a better one ;-)
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@ramirojpc said:
Hahahahaha....just doing my part to burn that Savage barrel to replace it with a better one ;-)
That may be, but unless you want to be having pieces of that bolt being removed from your face, you better back it down.
I'm not joking. 43gr is considered absurdly hot. Just because the brass will take it, doesn't mean you should do it.
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@ramirojpc said:
45.2gn of H4350.
What velocity are you seeing with this? That's about 4gr more than my favorite pet load.
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@orkan said:
@ramirojpc said:
Hahahahaha....just doing my part to burn that Savage barrel to replace it with a better one ;-)
That may be, but unless you want to be having pieces of that bolt being removed from your face, you better back it down.
I'm not joking. 43gr is considered absurdly hot. Just because the brass will take it, doesn't mean you should do it.
That was a joke, I am not doing that to burn the barrel. I did my pressure ladder and pressure signs started showing up at 45gn, more noticeable at 46gn, crazy at 47gn, and I never fired the 48gn round.
But since I found a really good load with R17 with 42.7gn, that is what I am using now. I am going to do a workup with H4350 at some point in the future, but for now 42.7 R17 is my goto load.
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@brittel said:
@ramirojpc said:
45.2gn of H4350.
What velocity are you seeing with this? That's about 4gr more than my favorite pet load.
I was getting 3080fps on average.
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@ramirojpc said:
@orkan said:
@ramirojpc said:
Hahahahaha....just doing my part to burn that Savage barrel to replace it with a better one ;-)
That may be, but unless you want to be having pieces of that bolt being removed from your face, you better back it down.
I'm not joking. 43gr is considered absurdly hot. Just because the brass will take it, doesn't mean you should do it.
That was a joke, I am not doing that to burn the barrel. I did my pressure ladder and pressure signs started showing up at 45gn, more noticeable at 46gn, crazy at 47gn, and I never fired the 48gn round.
But since I found a really good load with R17 with 42.7gn, that is what I am using now. I am going to do a workup with H4350 at some point in the future, but for now 42.7 R17 is my goto load.
Problem I had with R17 was it is so temp sensitive. Don’t remember the charge now but I had a hell of an accurate load worked up with it in my 6.5x47 and 130 vld’s At just over 3000 fps but it was useless do to the velocity swings I’d get from morning to evening well over 50 fps in some circumstances
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@bull81 said:
Problem I had with R17 was it is so temp sensitive. Don’t remember the charge now but I had a hell of an accurate load worked up with it in my 6.5x47 and 130 vld’s At just over 3000 fps but it was useless do to the velocity swings I’d get from morning to evening well over 50 fps in some circumstances
I have heard the same from others that use R17, but I haven't seen that yet. Granted, I've not shot that particular load in varying temps, but my guess is that I'll have a chance to do that around Dec when it gets colder out. Right now I am getting 2850fps with 42.7gn of R17 and I've shot it mostly around 70 deg. I'll give it a try when it's around 30 or so and see how it behaves.
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@ramirojpc I will put money on that it will drop. The only powders through Alliant I have found to be temp stable would be Arcomp, R16 and R26.
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Ran a quickload analysis out of curiosity.
@ramirojpc ... that 45.2gr load spikes at around 70,000 PSI. Full house loads are around 55k. So yeah... danger Will Robinson, danger.
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@orkan said:
Ran a quickload analysis out of curiosity.
@ramirojpc ... that 45.2gr load spikes at around 70,000 PSI. Full house loads are around 55k. So yeah... danger Will Robinson, danger.
DAYUM! Thanks man, I appreciate it. I will definitely go back to the drawing board with H4350.
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@orkan said:
@orkan maybe you can help me out, I’ve had quickloads now for several years and still haven’t figured out what the Z1 line is in the graph. One guy told me that you needed to adjust your loads so that Z1 and Pmax lined up. This meant an accurate load. I could be wrong but that didn’t add up to me. Still would like to know what Z1 stood for.
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The Z1 is where the progressive powder burn is done. From what I understand that is basically during the "build" of pressure. The quickload manual lays this out, so I won't rehash too much.
It seems rather insignificant to me as I all but ignore it during testing. The 95% number at top is indicating when 95% of the powder has been burned. That number is far more valuable for many reasons.
