I zapped one at 367 last year with mine. I was driving back from hunting after not seeing anything, which has never happened before, and saw a bunch feeding 10 yards from my porch.
I knocked on the neighbors door and asked permission. He thought there was no way someone could zap a deer that far with a muzzleloader, he thought it was like 600 yards, lol. So I laid down on his porch and had my buddy film it. 367 yards and she went down 10 yards from the pole building where we hang them.
We have a ton of deer around here so I usually take 10 or so a year, mostly does. I use a remington 700 action with the knight breech plug, lapua 308 case with a fed 215m primer, brux barrel, 73 gr of 4198 and a parker 327 gr bullet. Its 6.25 moa from 100 to 400 yards. Half moa out to 400 yards, havent shot it further yet. Oh and I do put my 4 port muscle brake on them. Makes spotting your shots easy, I like watching them fall down.
got a couple kill videos with the muzzleloader on the homepage of my website., the last kill is at 367 yards.