Whatever. This is the problem with “the guy said.” He probably does not have a $3700 pressure transducer on his $500 pressure test barrel that fits into his Universal Receiver.
QuickLoad says 2900 fps is 70,000 psi - which is proof load pressure, and a lot of hand-loaders load to this. If you buy a used gun from a hand-loader, you may have bought a gun that has fired hundreds or thousands of proof loads.
QuickLoad thinks 2700 fps is doable at normal pressures with a 90 grain.
With a 110 Hornady, QuickLoad thinks 2425 fps is doable.
Couldn’t tell you if he has any of the equipment you mentioned. You can ask him. I believe it’s the same guy that Wilson Combat hired during their development of the 7.62x40 WT cartridge.
With respect to Quickload, is it always accurate when compared to real-world results or have you noticed a given amount of error? Just curious as I’ve never used the software.
No, it is not always accurate, but if someone claims a velocity that QuickLoad says is 70,000 psi, it may be 68,000 psi. It may be 72,000 psi. It may be 66,000 psi. But it is not going to be 55,000 psi.
Quickload is not accurate when it comes to the 6.8 case, and or bore we have proved it with pressure equipt 3 years ago. I have Hornady proof loads that develop 70K psi, they turn the case into a belted magnum pushing the brass into the chamfer on the breech of the barrel and blowing the primers. At apx 60k swipes appear along with bad primer cratering, the 6.8 is capable of pushing the 90 TNT to around 3000 at those pressures when better spec barrels are used.
At 58-60K psi I don’t doubt 2850 is possible from a 90gr bullet in a 556 case if the correct powder is used, CCI 41 or 450 primers and a barrel with a generous bore area.
That sounds doable. But I don’t create custom loads which only work in my personal barrel. If I were to load 308, it should work in any gun marked 308. Same goes for 6.8 - at least I think so.
I hate to say it, but a 90 grain round out of a .223 case at 2900 fps out of a 16" bbl sounds just about impossible. 77 grain rounds only get around 2700 fps. I would believe 2600 or 2550 for a 90 grain…maybe.
Also, even if that were true, I doubt that you’d lose 400 fps by knocking off 3" from the barrel. Maybe 150 fps at most. If he got, say, 2600 fps out of a 90 grain round from a 16" bbl, I’d imagine you’d get about 2475 fps out of a 13"
You are using quickload to try to tell everyone what the pressure will be in their barrel to prove your argument, how accurate is quickload compared to a stain gauge?
I have pressure test ammo from Hornady to calibrate the strain gauge as well as ammo used by SSA which was developed on a pressure barrel built to my specs with my 5R rifling design that I gave to Art at SSA. You are not the only guy in the world that has access to a pressure barrel. http://www.neconos.com/details3.htm
You have not yet made a straw man argument in this discussion.
Also I said your load sounds doable, so I was not contesting your pressure - at least not when fired in your barrel. I do think it will be above normal pressure in a typical barrel.
No, QuickLoad is not accurate enough for a final answer - I just use it to raise red flags. One can then test to verify - but it should be an actual pressure test, not a ‘reading my primers’ test. Often proof loads at 72,000 psi don’t show primer problems.