Any guesses how many rounds this thing will run before the groups start to spread out? It likes 55 gr ammunition, using Fiocchi right now. Shoots .75 MOA pretty reliably, occasionally tighter if I am paying attention. I realize it all depends on X, Y and Z, so asking the question out of interest, just curious what I should expect. I don't hammer 30 rounds through it in 15 seconds, more deliberate about trying to shoot well and accurately. Has about 1700 rounds through it right now. Would appreciate any thoughts. Thx.