6x45mm vs 300 BLK?


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CmdrSlander
March 21, 2013, 12:30 AM
Which is better for precision shooting at moderate ranges?

6x45mm (aka 6mm/.223 - a wildcat cartridge made by necking .233 brass up to accommodate .243 cal bullets) or 300 Blackout?

ETA: The platform will be bolt action.

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ExAgoradzo
March 21, 2013, 12:32 AM
Cool factor goes to the 6x45.
Greg

Inebriated
March 21, 2013, 12:36 AM
I would step up from 6x45 to .243 WSSM.

CmdrSlander
March 21, 2013, 12:38 AM
I would step up from 6x45 to .243 WSSM.
Then I couldn't use my vast stockpile of .223 brass and accouterments :)

tahunua001
March 21, 2013, 12:52 AM
6x45 would get the nod. 300 blk is popular as a suppressed load because it's a heavy bullet going very slow... not suitable as a target load at all.

I seriously considered an AR in 6x45 but just couldn't find anyone that made the barrels... if you can get ahold of one then I wouldn't hesitate.

CmdrSlander
March 21, 2013, 12:54 AM
6x45 would get the nod. 300 blk is popular as a suppressed load because it's a heavy bullet going very slow... not suitable as a target load at all.

Not necessarily. It can be loaded with lighter bullets traveling at respectable velocities and shot for accuracy.

Inebriated
March 21, 2013, 12:54 AM
Ahhh. I gotcha.

In that case, .300 for suppressed shooting, 6x45 for non-suppressed shooting.

tahunua001
March 21, 2013, 01:10 AM
Not necessarily. It can be loaded with lighter bullets traveling at respectable velocities and shot for accuracy.
even so, 300blk drops like a rock, 100 grain 6x45 would shoot a lot flatter than a 125gr 308 and the smaller profile will keep velocity a lot longer and react to outside influences less.

CmdrSlander
March 21, 2013, 01:14 AM
even so, 300blk drops like a rock, 100 grain 6x45 would shoot a lot flatter than a 125gr 308 and the smaller profile will keep velocity a lot longer and react to outside influences less.
Indeed...

C-grunt
March 21, 2013, 01:33 AM
I really like the 300 BLk. I think it really makes the PDW concept a viable weapons system. However I would not use it as a moderate range precision round. It's just not made for that. I'm not up to par on the ballistics of the 6x45 but have you just considered going with a heavy 223? Once you get up to 75+ grains with a good long range bullet the 223 is pretty respectable as a target round to at least 800 yards.

eastbank
March 21, 2013, 05:58 AM
this 6x47(222rem mag case) shoots bug holes at 100yds and 1/2-3/4 " groups at 200yds and better than 2 inch groups at 300yds. i like it better than the 6x45 because of the longer neck,but thats just me. eastbank.

CountryUgly
March 21, 2013, 02:39 PM
6x45 for your described purposes. I like the .300blk and think it does very well in the areas it was designed for but a target round it is not. The 6 to 6.5mm rounds just shine at the bench and when chasing bean field deer.

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