The Brzyck formula assumes a linear progression for each rep. I find that the formula gets more accurate as the reps get higher (9, 10 or more reps), but not so good in the lower rep ranges. Another formula that I use tends to allow for lower reps at the higher percentages (85% for example). Theoretically, most average people can get 5 reps at 85%. There are slightly different co-efficients for deadlifting and other lifts, but they're not enough to account for what your indicating (barely, if at all, getting 3 reps).
What was your very first pull? How long have you been deadlifting? Finally, have you actually tried to determine how many reps you could get at 275, or are you just assuming that you can't get the reps? Deadlift gains usually come very fast at first and you might have just gotten better at 275 and not realized it.
Either way, congrats on the 315.
__________________
Training Log (Rapid Fat Loss)
“Resting is not an admission of failure, but a preparation for greater things to come. ”-John “Mahler” (JP Fitness)
|