Grendel and 5R Rifling (Haters gonna Hate)

[Drifter]

We shot through three chronographs simultaneously and the fps results for 5 shots were:

rickOshay - Satern 24" 5R cut rifled:
Magnetospeed: 2639 average, ES 10
F1 Chrony: 2636 average, ES 28
Beta Chrony: 2633 average, ES 19
overall average= 2636 fps with ES 19

XCR - Stoner/Liberty 24" 5R button rifled:
Magnetospeed: 2673 average, ES 53 (he had one shot that measured 2701 fps)
F1 Chrony: 2666 average, ES 43
Beta Chrony: 2647, ES 37
overall average= 2662 fps with ES 44

264 LBC 24" 3 Poly BHW barrel:
Magnetospeed: 2641 average, ES 21
F1 Chrony: 2622 average, ES 15
Beta Chrony: 2615 average, ES 12
overall average= 2626 fps with ES 16

XCR's barrel is faster, but does show more ES.

I added portions in red above.

Comparing the two 5R barrels (and assuming that my math is correct), the velocity difference between the Satern and AR Stoner (Liberty) was ~26 fps. The polygonal BHW was another ~10 fps slower.

The difference seems relatively normal, even between barrels of identical manufacture.

Those conducting the test could likely shed some additional insight, but if ammo was baking in direct sunlight at ~97ºF, it's not surprising that the last barrel ran the fastest and with the highest ES. (Even if that was not the case, the differences still seem insignificant.)

Without reviewing all of the details from this and other threads, it seems that the results from this small sampling are rather inconclusive in declaring a velocity king. And any of the extremely high speeds previously shared regarding the AR Stoner barrel were directly related to handloaded ammo.

So in summary, the primary takeaway is that this particular AR Stoner barrel runs somewhat predictably with factory ammo, but caution should be used with handloads (just as it should with any other barrel).

Correct, or am I overlooking something...?