G · Pittsburgh Steelers · #66

Mason McCormick

LG1

College: South Dakota State
Height: 6'5"
Weight: 315 lb
Experience: 3rd season

+ Compare Contract

Season

Snap share (offense)

100.0%

1st of 160 linemen

PEN/100

0.21▲ 0.11 vs '25

24th of 160 linemen

Line pressure rate

20.8%▲ 5.4 vs '25

61st of 160 linemen

YBC

2.48▲ 0.19 vs '25

74th of 160 linemen

Ranks compare against the 160 qualifying offensive linemen on the 2026 leaderboard.

Week-by-week

Offensive snaps by game, dashed line = 2025 per-game average

2026 game log

	Usage		Discipline			Line on the field
Game	Offensive snapsSnaps played on offense (Pro Football Reference snap counts, 2013 on).	Snap share (offense)Share of the team's offensive snaps played, in the games the player appeared in.	PenaltiesPenalties called on the player on offense (accepted or declined).	Holding penaltiesOffensive holding calls on the player.	False startsFalse start calls on the player.	Line sack rateSacks per dropback. The line's rate while he was on the field, credited by his share of snaps: public data doesn't say which blocker allowed a sack or opened a hole.	Line stuff rateDesigned runs stopped at or behind the line. The line's rate while he was on the field, credited by his share of snaps: public data doesn't say which blocker allowed a sack or opened a hole.	Rushing EPA per play (line)Expected points added per designed run. The line's rate while he was on the field, credited by his share of snaps: public data doesn't say which blocker allowed a sack or opened a hole.
Wk 1 vs ATLW	67	100.0	0	0	0	4.7	27.8	−0.25
Wk 2 @ NEL	70	100.0	0	0	0	8.7	4.8	−0.07
Wk 3 vs CINW	62	100.0	0	0	0	5.6	20.0	+0.13
Wk 4 @ CLEL	72	100.0	0	0	0	11.1	20.0	+0.02
Wk 5 vs INDW	60	100.0	0	0	0	3.0	23.8	+0.30
Wk 6 @ TBW	79	100.0	0	0	0	9.6	19.0	−0.04
Wk 7 @ NOW	64	100.0	1	0	0	8.8	11.1	+0.15
Season	474	100.0	1	0	0	7.6	17.6	+0.04

How he compares

2026 offensive linemen who qualify · dashed lines mark the group average

X axisY axis

Contract

Rookie deal · signed 2024 with Steelers

$4.8Mover 4 years

Avg. per year: $1.2M
Guaranteed: $765K 16%
2026 cap hit: $1.3M 0.4% of the cap
Signed: 2024
Runs through: 2027

2024

2025

2026 · now

2027

Year 3 of 4

Career by season

Career rates are weighted by volume, not averaged across seasons

	Overall			Discipline				Line on the field					On his snaps
Season	GamesGames played.	Offensive snapsSnaps played on offense (Pro Football Reference snap counts, 2013 on).	Snap share (offense)Share of the team's offensive snaps played, in the games the player appeared in.	PenaltiesPenalties called on the player on offense (accepted or declined).	Holding penaltiesOffensive holding calls on the player.	False startsFalse start calls on the player.	Penalties per 100 snapsPenalties called on the player per 100 offensive snaps.	Line sack rateSacks per dropback. The line's rate while he was on the field, credited by his share of snaps: public data doesn't say which blocker allowed a sack or opened a hole.	Sacks allowed by the lineSacks per dropback, leaving out those FTN charted as the quarterback's fault (holding the ball, running into the rush). FTN charting, 2023 on. The line's rate while he was on the field, credited by his share of snaps: public data doesn't say which blocker was beaten.	Line pressure rateDropbacks where the quarterback was hurried, hit or sacked (Pro Football Reference charting, 2018 on). The line's rate while he was on the field, credited by his share of snaps: public data doesn't say which blocker allowed a sack or opened a hole.	Yards before contact per carryHow far runners got before first being touched (Pro Football Reference, 2018 on), the clearest sign of run blocking. The line's rate while he was on the field, credited by his share of snaps: public data doesn't say which blocker allowed a sack or opened a hole.	Line stuff rateDesigned runs stopped at or behind the line. The line's rate while he was on the field, credited by his share of snaps: public data doesn't say which blocker allowed a sack or opened a hole.	Pressure rate on his snapsDropbacks where the quarterback was pressured or sacked, counted over the plays he was actually on the field (nflverse participation, 2016 on; published after each season, so not yet for the current one). Still the whole line's result: public data doesn't say which blocker was beaten. Rates before 2023 run a few points higher, from a change in the source's charting.	Pressure rate vs 4 or fewer rushersPressure rate on his snaps when the defense rushed four or fewer, so no extra blitzers to pick up: the purest public measure of a line's protection (nflverse participation, 2016 on; published after each season).	Sack rate on his snapsSacks per dropback over the plays he was actually on the field (nflverse participation, 2016 on; published after each season). Still the whole line's result.
2026	7	474	100.0	1	0	0	0.21	7.6	4.5	20.8	2.48	17.6	–	–	–
2025	17	1,031	100.0	1	0	1	0.10	5.2	2.4	15.4	2.29	18.5	20.5	19.4	5.2
2024	15	939	94.4	2	1	1	0.21	8.6	6.8	25.2	2.57	21.9	37.0	36.9	8.5
Career	39	2,444	97.8	4	1	2	0.16	7.0	4.4	20.1	2.44	19.8	28.0	27.1	6.7