.300 aac blackout 230 gr cast boolits. loaded in 303 british?

[GUNWHISPERER]

I want to load subsonic loads for my No4 mk1 using a 230 gr cast boolits the mold is a Lee .300 AAC BLACKOUT tumble lube .308 dia unsized measures .311 with a mic. I would like to use Universal Clays or herco any ideas/takers?

[Artful]

Subsonic loads to be accurate with a long boolit require a fast twist - what twist rate is your barrel? I'm looking at mine and it appears to be 1:10 so 180-200 grain would do well depending upon length - look at stability links
http://en.wikipedia.org/wiki/Miller_twist_rule
http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi
http://www.lasc.us/Brennan_2-3_Twist.htm
http://www.jbmballistics.com/ballistics/calculators/calculators.shtml

[303Guy]

As far as I can make out a 1-in-10 twist will stabilize a 260gr boolit. In fact, it might even stabilize a 300gr boolit. That's assuming a 300gr boolit is 1.6 inches long.

[GUNWHISPERER]

Yes it's a 1 in 10 twist. the rifle is a 1945 lee enfield no4 mk1 "T"

[GUNWHISPERER]

In addition I am hoping this would make a good combo to load subsonic. The Boolit is a boat tail sp

[GUNWHISPERER]

The JBM calculator gives it a Stability factor of 2.015

[GUNWHISPERER]

The boolit measures 1.3125 in length

[dlamp]

is the length of your 230gr boolit??

[dlamp]

this might give you some info far as load data
http://castboolits.gunloads.com/showthread.php?72271-Subsonic-rifle-load-data-wanted-for-303-Brit
i would think that u be able to use the unique data with universal clays being there about the same burn rate

[dromia]

What are your rifles bore and groove diameter, the boolit in question could be undersized, check first.