#1: 55gr bullets aren't light enough to blow apart from a 1/7 twist. In fact, a lot of shooters get away with 45gr bullets, but I wouldn't shoot those. Whole purpose of a 1/7 is so you can shoot the good stuff *cough Hornady 75's cough*. I'm sure a 35-45gr bullet would probably fly apart. Tiny bullets moving at 3,700+ fps in a corkscrew tight twist like a 1/7 just aren't meant for eachother. Aside from the massive centrifugal force placed on the bullet, I'd have to imagine that the bullet's jacked is being damaged trying to "stay on track" with the rifling.
#2: Wolf is weakly loaded, in other words - SLOW. Wolf doesn't break the 3,000fps barrier- period. At least not in my barrel, being measured with my chrono.
#3: Wolf ammo is notorious for having a very THICK and STRONG jacket. One that is absolutely useless for fragmenting. I'll make a guess and say this might help it stay together even better from a 1/7 barrel. But that is moot, since 1/7's don't blow up 55 grainers anyway.
I think you'd be good to go with Wolf. I have two 1/7's. A 16" and a 20". I shoot Wolf with no problems. Since the price was the same, I chose the 62gr Wolf. But I've used 55gr.
Also, another question about the heavier bullets (70+ grains) do they need to fragment to work for lethality or is it the mass that is causing lethality. In other words, do I need high velocity to get lethality from the heavier bullets? Since I am looking at a 16" carbine, velocity at 100 yds and on will be an issue....thanks...
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The heavy bullets have almost a whole new advantage factor. As .223 bullets increase in weight, they can only do so in length, as width is obviously a constant (has to fit the bore) As a result, heavier bullets are obviously much longer. Longer bullets need more RPM's to stabilize, this is why everyone's after the 1/7's. The heavy bullets, in addition to being long, are also somewhat of a hollow point design. Called "open tip match". The hollow point isn't designed to expand, it is there for accuracy. Also, these bullets, due to their shape and length, as well as having an empty cavity at the tip are very butt heavy. Combine length and mass at the rear, and these heavy .223's yaw violently and quickly. Just like, nope, even better than the Russian 5.45x39mm. The heavy .223's begin to yaw (tumble) very early after entering tissue. This obviously caused a much more traumatic wound. To make matters worse (or better depending on your point of view) they fragment violently.
You don't need higher velocity to get the heavy bullets to fragment. Any heavy bullet, loaded even to .223 saami specs (not hot NATO loads) will still have enough velocity at 100 yards to reliably fragment. The higher velocity just extends the range at which they will reliably fragment. Also, due to the design of the heavy bullets, their fragmentation range is greater than that of ligher bullets such as the 55gr. No matter what, a 75gr/77gr loading will outperform a 55gr loading regardless of range. Better destruction of tissue, and increased fragmentation range.