One of the important things to know before loading rifle ammunition is how far out (shallow) you can seat bullets, and what the optimized seating depth is for a particular bullet for your rifle and shooting application. For AR-MPR Phase II, we’re going for maximum accuracy, and also need to assure proper feed characteristics so that our rifle won’t jam. In this video, we’ll use the Hornady Lock-N-Load OAL gage, a modified .223 case for this tool (a Hornady product as well), and the Hornady Lock-N-Load Bullet Comparator kit to measure max COL for a particular bullet.

We’ll refer to these measurements towards the end of the AR-MPR Phase II single stage loading videos when we dial in the Redding Compeition Seating Die for our load.

Thanks,
Gavin