At 51 # @ 28, my Victory HV 350’s both bareshaft and shoot Big Jim’s ‘Big 3’ 300 grain heads quite nicely. The finished arrow is 28.5”s, 400 gns up front, 608 gns tot wt and 32.4% Ultra-EFOC.
Your shelf is likely less than my 1/8” past center shelf and could require a weaker shaft. I would estimate that a Victory HV400 with a 100 gn insert and a 250 gn head at 29”s would be approximately 547 gns and 30%+ Ultra-EFOC.
Note: Average bag targets don't care for these Ultra-EFOC set-ups.