Welcome! Remington ammo has a known history of problems with misfires, as was mentioned, excess headspace (recessed below the chamber face) will cause the issue. Remove the forend and see if the barrel is loose when the action is closed, if it is or the headspace is excess, it needs to go back to H&R for a new barrel, give them a call and make arrangements for them to repair it, ask them to cover shipping, toll free (866)776-9292. It could also be a defective transfer bar, you can check that easily by opening the action, pull the trigger all the way to the rear and hold it while holding the hammer and let it ease forward, with the trigger still held back, the firing pin should protrude from the breech face by at least .040", if it doesn't, there's a problem either with the pin or transfer bar or possibly the hammer.
Tim