Reminds me of the time I tried to shoot a 1" explosive target at 200 yards with my ultra barrel (1 in 12).
Shot #1, just missed it at 3 o'clock.
Shot #2 I aimed at 9:00, and it went exactly where I aimed it.
Shot #3 I aimed dead center and it was touching the first shot.
If I'd aimed all three in the same place, I would have had a 5/8-3/4" group with two shots touching. That was with Winchester white box 45gr, fired off Caldwell Deadshot bags full of white beans.
BTW, if you fill your sand bags with grain or beans, don't leave them out in the car trunk, or the mice will chew into them.
OP, I assume your rifle is 1 in 9" twist? I can't imagine shooting 69gr Sierras in mine.