what is my pressure...need quickload calc please

[whatwind?]

I have .308 win, .340 neck and .199 free bore, 44.75 gr Varget, Lapua large primer brass, fed 210m and 200 grain berger hybrid in a bartlein 31" 10.25 rot bbl

I get ejector circle on a 1/3 of my brass and velocity is averaging 2725 fps

I don't feel hard bolt lift, but I have a strong bolt lift on empty chamber anyway with strong firing pin/spring w/ defiance action

I assume somebody with quickload can help with chamber pressure?

 

[timeout]

I have .308 win, .340 neck and .199 free bore, 44.75 gr Varget, Lapua large primer brass, fed 210m and 200 grain berger hybrid in a bartlein 31" 10.25 rot bbl

I get ejector circle on a 1/3 of my brass and velocity is averaging 2725 fps

I don't feel hard bolt lift, but I have a strong bolt lift on empty chamber anyway with strong firing pin/spring w/ defiance action

I assume somebody with quickload can help with chamber pressure?

I have Quickload but hesitate to post info in case I have entered something incorrectly. I will say that when I encounter ejector marks on my brass, I back off charge weights.

 

[savagedasher]

I have Quickload but hesitate to post info in case I have entered something incorrectly. I will say that when I encounter ejector marks on my brass, I back off charge weights.

If you're near or jamming the bullet your adding as much as 5000 psi to your total . Larry

 

[XTR]

Just wait to see what that load does at 90F

 

[wboggs]

If you're near or jamming the bullet your adding as much as 5000 psi to your total . Larry

Your load is probably too hot. Bill

 

[whatwind?]

I am ".010 off/jump, 2.345 BTO and 3.085 COAL I think on the COAL, cant remember off the top of my head

I am will begin priming for the 3rd firing this week and will let you know if loose primer pockets

I suspected I was "hot" but the bullet likes this speed or down to 2650 ish, which is where most others are at with this combination

I have RWS and lapua palma brass ready to test also

 

[Jammer Six]

If you need the results of Quickload, pay your own way and buy the program.

 

[waldo1979]

... The fact that you're getting that kind of velocity using Varget, which generally is not the powder of choice to get the highest possible velocity at safe operating pressure, also indicates your load is likely to be very hot.

Agreed. That does seem pretty fast for that heavy of a bullet even with a 31" barrel.

 

[whatwind?]

You need to provide COAL and case volume in addition to the other info listed above to get the best pressure prediction from QL. I've played around with QL and potential 200 Hybrid loads fairly recently. Based on the fact you're using standard Lapua brass, which has slightly less capacity than Palma brass, and your velocity/charge weight, I'd guess you're likely to be somewhere in the 64-67K psi range, but that's just a guess.

In any event, it's likely to be a very hot load as others have mentioned, way over MAX SAAMI pressure. If your pressure is in the range I guessed above, don't expect your brass to last very long, like maybe only 1 or 2 firings. Even Palma brass might not hold up to those pressures for very long. In order to have any chance of hitting the higher OBT node at workable operating pressure with the 200 Hybrid, you really need Palma brass, a 32"+ barrel, and the right combination of powder/primers. IIRC, your velocity should be very close to an OBT node. The fact that you're getting that kind of velocity using Varget, which generally is not the powder of choice to get the highest possible velocity at safe operating pressure, also indicates your load is likely to be very hot.

Thank you

 

[dmoran]

If you're near or jamming the bullet your adding as much as 5000 psi to your total . Larry

Maybe in your QL results, with the ways that you input and use it, but not in actual real world results. And almost impossible in actual pressure to have that much pressure variance from off to on. 1000-psi possibly or maybe even 2000-psi from a hard jam, but not 5000 or any where near that much will you see in actuality.
Donovan

 

[whatwind?]

Ok, so I have primed with wolf primers and half still have good tight pockets and the other half slide right in, none fall out

Any safety concerns shooting theses rounds where the primer slides in with no "feel"?

Also, I tested rws brass with same 44.7 gr varget and they were way too hot and I got up to 44.5 gr varget with lapua Palma brass with no issues

 

[Keith Glasscock]

Yup, you are too hot.

Primers without any interference fit can result in gas leaks, gas cutting of the bolt face, and probably more bad stuff that I can't think of.

According to the experienced F/TR shooters I have worked with, palma brass takes more powder to make a given velocity than large primer cases.

BTW, 2650 shoots really, really good.

If I had to guess, you are probably north of 70k psi - The Varget simulation in QL needs some significant tuning to work with 308 and heavy bullets.

 

[whatwind?]

Thank you

 

[Dusty Stevens]

Summer is coming up- that .2 you seen is just the beginning. Step down one node or youll be on the ragged edge in the mornings and too hot come mid day and itll splatter

 

[dkhunt14]

Maybe in your QL results, with the ways that you input and use it, but not in actual real world results. And almost impossible in actual pressure to have that much pressure variance from off to on. 1000-psi possibly or maybe even 2000-psi from a hard jam, but not 5000 or any where near that much will you see in actuality.
Donovan

If you're near or jamming the bullet your adding as much as 5000 psi to your total . Larry

I remember reading tests where they actually measured chamber pressures. In some of them tests, depending on caliber and throat, the in the lands, actually had less pressure then a jump. I believe that was caused by some cases that used up powder capacity. With my long throats in both Dasher and WSM I don't see much difference between 5 off and 5 in. The Chronograph backs this up. Matt

 

[DaveTooley]

The ejector pin mark is the only honest sign of pressure. It appears when you exceed the yield point of the brass. Even then that's a moving target if you use different manufacturers brass. RWS is the toughest I've used. I take one case and reload it as I go up on the powder charge, seating depth is touching the lands. When I see the ejector pin mark I've reached max charge in a worse case scenario, temp dependent of course. Then I back off on the powder charge and throw the one case in the trash.

 

[Shynloco]

I have .308 win, .340 neck and .199 free bore, 44.75 gr Varget, Lapua large primer brass, fed 210m and 200 grain berger hybrid in a bartlein 31" 10.25 rot bbl

I get ejector circle on a 1/3 of my brass and velocity is averaging 2725 fps

I don't feel hard bolt lift, but I have a strong bolt lift on empty chamber anyway with strong firing pin/spring w/ defiance action

I assume somebody with quickload can help with chamber pressure?

whatwind,

Might just be the difference in bullet weight, barrel length (10 twist/26") and distance that we shoot, but I load 42.3 grs of Varget in my .308 shooting 168 gr bullets, with similar neck sizing and freebore. Using those numbers, you are 2 full grs above me and the pressure issue doesn't surprise me a bit.

Alex

 

[dkhunt14]

The ejector pin mark is the only honest sign of pressure. It appears when you exceed the yield point of the brass. Even then that's a moving target if you use different manufacturers brass. RWS is the toughest I've used. I take one case and reload it as I go up on the powder charge, seating depth is touching the lands. When I see the ejector pin mark I've reached max charge in a worse case scenario, temp dependent of course. Then I back off on the powder charge and throw the one case in the trash.

I do the one case thing also. I want the case to be fired more then once when I reach the upper loads. This way it shows bolt click better. New brass gives false pressure indications and doesn't show as well till it's loaded a few times. Matt

 

[danny]

Your load is probably too hot. Bill

Without looking at load data, I think that I would probably agree here. I load enough .308 in the year to have a little feel for typical charges. My loads are stiff loads with RL15 meant for 1000 yards out of an M1A/M14. I shoot the Berger 185 Match BT. As best as I remember, they clocked probably something like 2550-2650, but again, I am going from memory. I have not used Varget for .308 in a while. Your charge weights seem from my recollection, more like what I might have used for 175 Berger VLD loads for 1000 yards out of an M1A, and you are punching 200's out of the end of the barrel. I would seriously recommend scaling the powder back down, possibly not even fine tuning the upper limits of the load till you can do it in about the warmest weather you will encounter.

Danny