At least 2 hours before cooking, pat the backstrap dry with paper towel and season liberally on all sides with 2 teaspoons venison dry rub (more or less to taste). Place in the fridge, uncovered for at least 2 hours, or covered overnight.
An hour before cooking, remove the backstrap from the fridge so it can come up in temperature.
At the same time, preheat your pellet grill to 225 degrees, making sure the hopper is filled with apple or other fruit wood pellets.
If using, place temperature probes from your instant read thermometers into the steaks, setting the alert for 110 degrees.
Place the backstrap in the center of the grill and smoke until they reach 110 degrees internally. Remove from the grill and store in a warm place (tenting the meat with foil on a pan works well, here). Remove temperature probe for easier handling, if desired.
Increase the temperature of the grill to 450 degrees for a good sear.
Sear the backstrap for 2 – 3 minutes per side, or until internal temperature reaches 135 degrees on an instant read thermometer. (Cook time will vary depending on the thickness of your backstraps).
Remove from grill and tent steaks with foil to rest for 5 minutes. Carryover cooking will bring the steaks up to 140 - 145 degrees internally. For a more well-done backstrap, sear for an additional minute or two per side before resting.
After resting, slice and serve with your favorite sides!