300 AAC Handloading data for 123 and 155 gr

[acidone]

I'm looking for some reliable reloading data on the new 300 AAC Blackout round. I'm going to be using this mostly in a bolt action and was wondering what the right powder and charge i should be using for 123 gr fmj and 155 smk bullets. Also, should i use a different powder and or charge if i decide to run those weights in an AR platform with a 16" bbl? Please help!!!

 

[rsilvers]

Re: 300 AAC Handloading data for 123 and 155 gr

H-110 powder seems to be the best store-bought powder for both the 123 and 155. I recommend the 135 MK over the 155 though. Or from a bolt gun, might as well use the Sierra 110 Varminter (but does not feed well from AR).

If you are trying to make 3-gun Major PF, then I would suggest a 175 MK and A1680 powder and loading to 2.26 OAL (which will need a modified mag to feed in an AR).

Same powder for AR and bolt gun. However, an AR may want a shorter OAL for the longer bullets to feed from a USGI mag.

 

[acidone]

Re: 300 AAC Handloading data for 123 and 155 gr

Thanks!!! That helps out a lot

 

[acidone]

Re: 300 AAC Handloading data for 123 and 155 gr

How much powder do you use for the the different bullet weights?

 

[rsilvers]

Re: 300 AAC Handloading data for 123 and 155 gr

I don't want to give powder charges. Sierra is planning to add it to their loading manual though and will pressure test it.

 

[Rotortuner]

Re: 300 AAC Handloading data for 123 and 155 gr

Do some research on here:
http://www.quarterbore.net/forums/forumdisplay.php?f=38

You should be able to find some starting load info for whisper stuff that should atleast get you started. As always start low and work up.

CJG

 

[Creature]

Re: 300 AAC Handloading data for 123 and 155 gr

I want a load for 110gr AMAX

 

[Rotortuner]

Re: 300 AAC Handloading data for 123 and 155 gr

Find the charge weight for the 123 and start with that on the 110 amax. then work your way back up. shouldnt be difficult.

CJG