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Old 04-10-2007, 04:09 PM   #1
 
Join Date: Mar 2006
Posts: 49
COL Needed

.223/5.56mm, Bullet:.224 69gr BTHP Barrel Length: 20in Barrel Twist 1 in 8
Note:
IMR/Hodgdon shows 2.235
http://data.hodgdon.com/cartridge_load.asp
Winchester shows 2.120
http://data.hodgdon.com/cartridge_load.asp
Lyman 48th Page 145 shows, 2.260
Anyone know for sure?
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Old 04-10-2007, 05:49 PM   #2
 
Join Date: Nov 2005
Posts: 134
I don't think it matters - as long as you check for pressure signs while working up from a light load. I'd bet the short length rounds have less powder in them.

I personally load to 2.260" in a 1:8" RRA NM4 20" Wylde chamber AR.
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Old 04-10-2007, 06:40 PM   #3
 
Join Date: Aug 2004
Posts: 256
Hercules powder chart shows 2.260.
oneshy is offline  
 
Old 04-10-2007, 07:18 PM   #4
 
Join Date: Mar 2006
Posts: 49
I'm working up this Load for the A2
[img]http://i32.photobucket.com/albums/d9/RWLambo/Gun%20Photos/RockRiverArmsNM.jpg[/img]
Looking for an accurate Load for the 52gr BTHP too!
Thank You!
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Old 04-10-2007, 08:08 PM   #5
 
Join Date: Nov 2005
Posts: 134
The A4 is what I have. Need the 53gr SMK flat bottom bullet, not the boat tails. Put 26.0gr TAC under it, CCI BR-4 primer. That's what I use at 200yds or less as long as it's not windy. If windy, I use 69gr SMK with 25.5 varget. Both loaded to 2.260" COAL.
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Old 04-18-2007, 09:34 PM   #6
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Join Date: Aug 2003
Posts: 449
2.260 for the 69's for me with the wylde chamber.
I think the 2.260 came about as the max OAL for mag length but most people I know use it.

I also load my 68 hdy's to 2.260 which puts the cannelure out of the case. Groups are smaller than loading to "cannelure" length

My RR 1/8 also likes the 53 flat base better than the 52 boat tails
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