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<blockquote data-quote="Koshinn" data-source="post: 1600778" data-attributes="member: 18314">Not targetted towards you, but I really don&#039;t like the &quot;if it ain&#039;t broke don&#039;t fix it&quot; attitude. Innovation rarely takes giant leaps, it&#039;s often incremental. That being said, the 300AAC is an interesting round because it can use STANAG mags and regular AR lower receivers.Let&#039;s look at, say, a 9mm sub machine gun or AR and compare it to a 5.56 AR.Firing supersonic without regards to noise, the 5.56mm round will outperform 9mm in terminal ballistics and range, although will most likely lose in penetration (depending on loads). Firing subsonic where their velocities are equal, the 9mm round will win in every way. The 300AAC round is somewhere in the middle of everything. It can outperform 5.56 subsonic and outperform 9mm supersonic. The advantage is that all it requires is changing magazines (or alternating your bullets I guess, but that&#039;s kind of strange). Interestingly (or perhaps not), a supersonic 300AAC round is very similar to a 7.62x39 round (300AAC: 125gr OTM @ 2250ft/s vs 7.62x39: 123gr FMJ @ 2400ft/s). From the &quot;stopping power&quot; perspective the 300AAC round could completely replace 5.56mm. From ballistics at longer ranges, I have no idea, but that&#039;s possible too.</blockquote>

[QUOTE="Koshinn, post: 1600778, member: 18314"] Not targetted towards you, but I really don't like the "if it ain't broke don't fix it" attitude. Innovation rarely takes giant leaps, it's often incremental. That being said, the 300AAC is an interesting round because it can use STANAG mags and regular AR lower receivers. Let's look at, say, a 9mm sub machine gun or AR and compare it to a 5.56 AR. Firing supersonic without regards to noise, the 5.56mm round will outperform 9mm in terminal ballistics and range, although will most likely lose in penetration (depending on loads). Firing subsonic where their velocities are equal, the 9mm round will win in every way. The 300AAC round is somewhere in the middle of everything. It can outperform 5.56 subsonic and outperform 9mm supersonic. The advantage is that all it requires is changing magazines (or alternating your bullets I guess, but that's kind of strange). Interestingly (or perhaps not), a supersonic 300AAC round is very similar to a 7.62x39 round (300AAC: 125gr OTM @ 2250ft/s vs 7.62x39: 123gr FMJ @ 2400ft/s). From the "stopping power" perspective the 300AAC round could completely replace 5.56mm. From ballistics at longer ranges, I have no idea, but that's possible too. [/QUOTE]

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