Recomandation : Bullet seating depth gauge

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Cost Effective Hornady Comparator: (I use these)

https://www.hornady.com/reloading/precision-measuring/precision-tools-and-gauges/lock-n-load-bullet-comparator#!/

Higher quality of same type as Hornady:

Bullet - Modular Headspace Comparator Bullet Inserts — Short Action Customs, LLC

www.shortactioncustoms.com

Really Fancy one:

Seating Depth Comparator

The Accuracy One Seating Depth Comparator measures bullet seating depth, ensuring consistency. Compatible with 22 to 30 caliber cartridges.

bullettipping.com

Ditto

The repeatability/accuracy of your measuring devise is critical.

I will third this. I started off using the Hornady comparator set and switched to the Short Action Custom comparator, which I found to be really well made and what I believe to be more consistent (or easier to be more consistent with). That being said after watching F Class Johns video on the above accuracy one seating comparator, it has me considering adding it as another data point.