Today was Christmas, Fourth of July, and my birthday all rolled into one, because my pressure trace arrived !!!!

I mounted one of the strain gages on a 7-30 TC carbine, just because the TC is amenable to mounting a gage. This gage was mounted with superglue so that it could be removed later with acetone. I had a hard time getting the superglue to stay stuck, so I wasn't sure that the gage would work correctly, but it worked fine.
In theory, if the gage is mounted correctly, on a straight cylindrical section of the barrel, in the middle of the chamber area, you should be able to get good absolute pressure readings. But the manufacturer recommends using a known load to verify the pressure, and I felt like that was a good idea, since this is new to me and I'm not real confident in the setup yet.
For a verification load, I used a 130 gr Speer spitzer, 39.0 gr. IMR 4350, 2.80" COL. Quickload predicted 44587 psi and 2562 fps. Actual velocity was 2421, and the pressure trace was seeing 46 - 48 ksi, so I elected to subtract 3000 psi from the pressure trace readings to bring the PSI down to about 44 ksi. That seemed reasonable, considering the velocity was a little low, and Quickload usually errs on the conservative side.
Now for a cast bullet load. Today it was a 150 gr. cast driven by 36.0 gr. IMR 4350, with Felix lube and heat treated WW. Quickload predicted 41576 psi at 2351 fps. Actual velocity was 2199 fps, and pressure trace was seeing 39 ksi. So lower velocity but lower pressure, too, which seems reasonable. Thanks to pressure trace, we can see that this load generated some nasty secondary pressure spikes.

The secondary spikes are real, as Charlie Sisk proved by blowing the muzzle off a gun or two. They tend to be pop up with slow powders and light bullets, and especially with "slick" bullets, like moly coated. Now we know that they happen with cast bullets, too. The solution is to switch to a faster powder or a heavier bullet. You can also make it go away by shortening the barrel, but I'll pass on that option. IMR 4350 is slow for this cartridge and I only used it because I have a bunch of it and because traditional wisdom says to use slow powders in high velocity cast bullet loads.
Accuracy was 9 shots in 3.3" at 100 yards, nothing to brag about. This gun shoots well with a 170 gr. bullet, so I may try a 160 grainer next..... and a faster powder.