1/7 "Target Lock" buff stacks based on % of magazine consecutively hit. Smaller mag + higher RPM = faster high buff. Sorted by fastest high effect. In PvE, hitting entire mag gives ~25% cumulative damage increase.
2/7 For 750 RPM SMGs, ranking differences are just 1 round of mag size, so same weapon with different 2nd column perk (Magazine) can easily change position. AR's Perpetual has surprisingly high effectiveness. Meanwhile Rufus, despite high RPM, has very large mag so effect builds slowly.
3/7 Roz Broke is low RPM so effect builds slowly, but consider its high range. Target Lock by design is less effective against weak enemies, so in PvE you'd use it in hard content. Dying from getting close with short-range weapons defeats the purpose.
4/7 One use of this table is comparing to other damage perks. For example, Frenzy is +15% damage, but Rufus Target Lock needs 2.29 seconds of continuous hits for +15% cumulative damage. Whether you can fight like that is one decision criterion.
5/7 This week's NF reward The Swarm: Target Lock hits +10% cumulative at 1.96 seconds, matching Heavy Vorpal's +10%. If you're swapping to shoot after stunning Overload Champions (stun is ~5.5s), Target Lock probably has higher DPS.
6/7 Retrofit stands out among LMGs. No setup required, 5.13 seconds to empty mag into tough enemy for +25% cumulative damage. Enhanced version is slightly stronger at ~28% for full mag.
7/7 This table only shows how fast PvE Target Lock effect builds, not weapon strength ranking. Cumulative damage increase is hard to grasp for this perk, so hopefully this helps when choosing best perk considering weapon stats, skill level, and situation.