a lot of Hornets use a 1/14 twist, which should be sufficient to stabilize a 55gr spbt. Some hornets (most older & foreigh-made ones) use a 1/16th, which will probably not stabilize it. Another thing to watch out for is COAL. With a 55 gr spitzer, you may have to seat the bullet so far down in the case (in order that it functions in the magazine) that it significantly intrudes into the already-limited powder area. In any event, your velocities are likely going to be somewhere in the 2200-2400 fps area (just a guess.) Unless you have a really good reason for wanting to use a 55 grain bullet, I'd suggest you try something 45gr or less.