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Hey now, Im an AK guy that should say enough about that. A little carbon doesnt bother me.. But some fellas turn their nose at it.. More for me.Carbon-schmarbon.... CLEAN YOUR WEAPON, YOU MAGGOTS!!
I'm having pressure problems on my reloads.
How does one have pressure problems, with the only recourse being to buy ammo??!!
Please tell me you aren't "Reading" pressures by brass...?
In the long run/final analysis, even were one to have a fancy gizmo, even if that gizmo said "perfecto" or whatever, the brass tell is what really matters.. upon any particular occasion.How does one have pressure problems, with the only recourse being to buy ammo??!!
Please tell me you aren't "Reading" pressures by brass...?
I don't think it'd be wise to blow up your gun, no matter what a chronograph says.No, brass and primers don't tell you anything, and here is why.
Anyone know what alloy their brass is?? Nope. How about their primer cups? Again, no. Anyone remember the reason why CUP is no longer used for modern cartridges? Because SAAMI sent some very carefully calibrated copper Crushers to the major ammo makers, had them test a standard reference load. The results reported pressure variations on the order of 20,000 PSI. Much like when it was discovered that Lead Crushers no longer accurately reported (at the time) high pressure cartridges, they moved to Copper Crushers. Then it was discovered that Copper won't report accurately over around 45,000 PSI, so strain gauges are now used.
Moreover, IF one were to use something similar to Olin C260 alloy like was used during contracts for the 30-06; it was spec'd to be hardened to almost 80,000psi.
So knowing that very carefully calibrated copper crushers can't accurately report modern pressures, there is ZERO way for uncalibrated, unknown alloy brass and primers to magically be more accurate.
So what is a guy supposed to do, without "fancy gizmos"? Use your chronograph!! Book data is pressure tested, all powder tells you to drop your loads by 10% when switching lots. So now you know an approximate burning rate variation. Start low, chronographing the whole time and work up. Book data uses SAAMI minimum spec chamber, bore, & Groove. Production firearms are not that tight, so your velocity will not be the same at the same pressures. Working up with the chrono, you will see what amount you are slow by. Once that difference changes, you know that you are over tested pressure, regardless of charge weight, again due to the difference in burning rate.
If you do have said "gizmo" like this Pressure Trace system, you can see that "Pressure Signs" weren't showing up in this test I did, and you can see the pressures I had.
View attachment 248060
Precisely. That's why reading brass and classic signs will get you in trouble quick. But if you watch the chrono, from starting loads, you can keep yourself off the DL.I don't think it'd be wise to blow up your gun, no matter what a chronograph says.
It still tells you something, because as you pointed out you don't know the composition of your brass. If nothing else it's telling you that your brass is bubblegume and cannot handle the load you are putting in it regardless of what your chrono and the book says.No, brass and primers don't tell you anything, and here is why.
Anyone know what alloy their brass is?? Nope. How about their primer cups? Again, no. Anyone remember the reason why CUP is no longer used for modern cartridges? Because SAAMI sent some very carefully calibrated copper Crushers to the major ammo makers, had them test a standard reference load. The results reported pressure variations on the order of 20,000 PSI. Much like when it was discovered that Lead Crushers no longer accurately reported (at the time) high pressure cartridges, they moved to Copper Crushers. Then it was discovered that Copper won't report accurately over around 45,000 PSI, so strain gauges are now used.
Moreover, IF one were to use something similar to Olin C260 alloy like was used during contracts for the 30-06; it was spec'd to be hardened to almost 80,000psi.
So knowing that very carefully calibrated copper crushers can't accurately report modern pressures, there is ZERO way for uncalibrated, unknown alloy brass and primers to magically be more accurate.
So what is a guy supposed to do, without "fancy gizmos"? Use your chronograph!! Book data is pressure tested, all powder tells you to drop your loads by 10% when switching lots. So now you know an approximate burning rate variation. Start low, chronographing the whole time and work up. Book data uses SAAMI minimum spec chamber, bore, & Groove. Production firearms are not that tight, so your velocity will not be the same at the same pressures. Working up with the chrono, you will see what amount you are slow by. Once that difference changes, you know that you are over tested pressure, regardless of charge weight, again due to the difference in burning rate.
If you do have said "gizmo" like this Pressure Trace system, you can see that "Pressure Signs" weren't showing up in this test I did, and you can see the pressures I had.
View attachment 248060