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Regarding how different rounds perform in drywall, I tested this. Turns out what gets stopped most easily is lightweight varmint or softpoint bullets in .223.

This may clarify things: http://how-i-did-it.org/762vs308/

I had to grin when I saw this post because just yesterday my 18" DSA STG58 got taken to the range for the first time. Reading about cycling issues with shorter-barreled FALs had me worried about potentially having to close the gas down very tight to get reliable performance, but those fears...

I did a writeup on the difference: link

The Mini is direct impingement: Gas is funneled out of the barrel and blasted right onto the op-rod. Here's a review of the Mini I bought. I disassembled it and took some photos of the internals, which you might find interesting. It looks a bit different now... And since then...

Regarding how group sizes combine (e.g. the 1/4 MOA shooter with 1/4 MOA ammo and a 1/4 MOA rifle), it's not additive. Sometimes one source of error will act to counteract another; for instance, the shooter might pull slightly right at the same time that the rifle happens to shoot a bit left...

When dealing with internet claims of accuracy, I find the following glossary helpful: group: three shots from a warm barrel flyer: shot that would make a group too large shoots MOA: once shot MOA until the barrel heats up: until bullets pass down the bore shoots MOA all day long...

Not all .223 rounds behave the same. Depending on bullet type, .223 may be the best option for limiting penetration through interior walls. Softpoint .223 has the least penetration of any round in this test: http://230grain.com/showthread.php?t=65428

Not sure where you're getting your information. Everything I've read and heard touts the reliability of the Mini.

Tony, can you tell us more about the .458 SOCOM Mini-14 you made? Was it based around the Mini-30 for the bolt face?

A friend and I did some drywall penetration tests with a variety of .223 rounds designed for self-defense. Here are the results. We used the 55-grain and 60-grain TAP offerings, as well as some Fiocchi ammo that uses 40-grain V-Max bullets that are likely similar to what's used in 40-grain...

Based on what I've read, you'll probably want to set the shoulder back more than just one or two thousandths if reloading for an autoloader. The link you provided appears to be based around bolt-action reloading, where a fired case is a close match to the chamber. Semi-autos usually grow the...

Well put. This is my reason for choosing an M14-style rifle. It's a do-it-all rifle. You can get rifles that are lighter, more accurate, have better iron sights, function more reliably, or are faster and easier to use for CQB-style shooting--but there's nothing that beats the M14 in all those...

Not exactly.

I see a lot of people opine that they don't consider the Mini-14 as durable enough for combat. Why is that?

How about nonmagnified scopes? I have an Aimpoint on my Mini and would rather not fight the loctite to take it off. It technically cowitnesses with the irons, though, so I could just turn off the dot if need be.

Yeah, that follows. If the military loads produced slower muzzle velocities, that would likely be the cause. However, the military loads have everything working against them in terms of velocity (reduced case size and older, faster powder), so you'd expect them to be clearly slower if...

Regarding the pressure difference, the following is what I've come to believe. The Army manuals well back into the 50s listed the pressure for rounds as PSI, although it wasn't until the 70s that they started using the electrical pressure sensors that actually measure pounds per square inch...

To those saying that they wouldn't trust a Mini-14 to stand up to battlefield conditions, what are you basing this statement on?

AR mags are too wide for the Mini-14 receiver. If you made the receiver wide enough to handle AR magazines, it would end up putting a lot more angular force on the bolt via the op-rod. Good thing I prefer the rock-and-lock magazine style anyway.