Loaded 160gr Hornady RN today

[Jimla]

I usually record my gas port diameters but I forgot on this barrel. I can say that the rifle cycled fine with a non-adjustable gas block with the brass coming out at 3 o'clock which is where I time most of gas rifles. The only timing mitigation was the carbine lower this was fired from has an H buffer. I’m also not seeing any extractor strain on the case head or extr/ej swiping, which is usually the case with with latent pressure (and/or overpressure). Here is the predicted gas curve via QL. I’m thinking its pretty close based on the previous.



As someone else noted, QL is predictive model that isn't failsafe, but the actual evidence I've seen so far hasn't tripped any wires for me yet.

I agree with you.

I looked at your quick load graph you gave and it looks like the velocity increase becomes constant, straight line, after 9.5 - 9.75 inches. No major acceleration of velocity because extra energy of burning powder. So if your gas port is after that point you should be OK. That would explain why you not having any problems with tubes breaking.