308 subsonic

[Alleycat]

Originally Posted by LouBoyd

I own both LR-308s and 300 Whispers. None of them has or needs adjustable gas blocks or needs special buffer springs. I don't attempt to use supersonic loads in the 300 Whisper or subsonic loads in the LR-308.

There are a lot of reasons not to have a "does it all" subsonic/supersonic ARs. The main ones are:

different optimum barrel twist rates
different barrel length for desired performance
large difference in gas system Over 5 times difference in
available propellant gas.
Difficultly in achieving low velocity dispersion using excess capacity cases.
Wimpy performance from supersonic 300 Whisper compared to a 308 with no benefit.
Different throat requirements for light supersonic versus heavy subsonic bullets.
Different scope choice and different sight adjustments for super and sub sonic shooting.
Different suppressor requirements (if used)

By having separate dedicated rifles both can remain set up and and immediately ready for use.

http://en.wikipedia.org/wiki/George_Mallory

[LouBoyd]

Originally Posted by Alleycat

http://en.wikipedia.org/wiki/George_Mallory

What has that to do with the subject? Are you saying Mallory wouldn't have wanted two rifles? I'd agree with that, at least not a subsonic one. There's no mention in the article of any firearms.

Or are you saying you also take on difficult and adventurous tasks just for the enjoyment of it?

[i8asquirrel]

Originally Posted by LouBoyd

I own both LR-308s and 300 Whispers. None of them has or needs adjustable gas blocks or needs special buffer springs. I don't attempt to use supersonic loads in the 300 Whisper or subsonic loads in the LR-308.

There are a lot of reasons not to have a "does it all" subsonic/supersonic ARs. The main ones are:

different optimum barrel twist rates
different barrel length for desired performance
large difference in gas system Over 5 times difference in
available propellant gas.
Difficultly in achieving low velocity dispersion using excess capacity cases.
Wimpy performance from supersonic 300 Whisper compared to a 308 with no benefit.
Different throat requirements for light supersonic versus heavy subsonic bullets.
Different scope choice and different sight adjustments for super and sub sonic shooting.
Different suppressor requirements (if used)

By having separate dedicated rifles both can remain set up and and immediately ready for use.

and probably most important, yet another way to justify to the wife the need for yet another rifle in the safe!

[Alleycat]

[QUOTE=LouBoyd;23080]What has that to do with the subject? Are you saying Mallory wouldn't have wanted two rifles? I'd agree with that, at least not a subsonic one. There's no mention in the article of any firearms.

Or are you saying you also take on difficult and adventurous tasks just for the enjoyment of it?[/QUOTE]

Exactly. I have multiple guns that are setup for super and sub. Why shoot subsonics though my 308 when I have a Whisper? Because it's there. That said, some guns are primarily for super and some are for sub.

[41MB-04TJ]

Earlier in this thread that was mention of reduced capacity cases. Who makes aluminum and who make the European brass? I found the Liberty Suppressors, but have not heard back from them.

Thank you

[Artful]

I don't know if Liberty Suppressor is up to making them anymore.
http://www.libertycans.net

the Canuk company that was making Aluminum doesn't have a website up anymore, so probably gone.

Never found the small Euro brass maker myself.