While I've reloaded quite a bit for AR-15s, I've mostly loaded magazine length bullets. I have some 80 grain Sierras that I'm planning to load for my Wylde chambered AR-15. I know the OAL listed in the Sierra manual (2.550) is way too long for my chamber. From what I've read, OAL around 2.470-2.475 is probably about right for the Wylde chamber with the 80 grain SMK (but you have bullet tip inconsistencies to account for), but I wanted to get a good reading using the Hornady O.A.L. gauge. I have a straight gauge that I've always used and it works great on my bolt rifles. I couldn't get a consistent reading with it in the AR-15 so I went out and bought the curved gauge - which I was told is more accurate for the AR-15 - and tried it. Readings are all over the place even though I'm trying to be as consistent as I possibly can be. So I'm wondering what I'm doing wrong. Am I the only one who can't get a good measurement using these gauges on an AR-15? Should I just punt and try to load around 2.470 COAL?