.223 Loading Data

Any one have any loading data with the .223 using SMP-842 powder -60 to 70 gr bullets?? Tnx

I've got lots of loading data for .223, but for heavies, I am using TAC, Varget, Re15, and XBR 8208. I haven't heard of SMP-842. I'll have to look into that one.

I use to use Re 15 but switched to AA 2460 for my 75 grainers. 2460 meters much better for me that Re 15 and accuracy has stayed the same.

Sorry no info on the SMP-842.

Virgil

Just google SMP-842 (also referred to as WC-842) ... initial rumornet assertions had it as equivalent to CFE 223, while numerous more recent posts indicate that it runs significantly hotter than CFE.
Only thing that's certain is that it will vary lot to lot just as 844 and 846 have ... always work-up when starting a new lot.
Personally I use RL-15, 2460 and 4895 for 69gr+ in 223 ... 8208 when I'm done the current 8#'ers.
/B

Thanks guys for info.Near as I can tell,SMP-842 is a military powder with some of the characteristics of CFE 223 (minimum copper fouling)+clean burning too.I am aware of the warnings as to amount of powder to use to prevent high pressure.I also believe it was primarily used /designed for the AR-15 length bbls.When I do load developement for this powder, my primary concern will be one of safety and will look for any sign of too high pressure. My secondary concern will be group size at 100 yds and beyond.The bullets,if I can find more,will be the Sierra SMK-69 grains and the Nosler 69gr HPBT-if I can find any at all.My starting charge will be 22 grains-and from there will increase at .3 gr increments.Will keep you informed.

Barrel 16",1:8" twist,Sierra SMK 69gr .223 bullets (#1380),New Federal Brass and WSR primers.Started at 22 grs using SMP-842. In steps of .3 grains, increased to 24.4grs carefully looking for any signs of pressure-none found. It became clear,with this particular bbl(Red-X bull) that perhaps a slightly lighter weight bullet,different brand bullet or powder might reliably produce 1" groups or better, at 100yds.

Follow up with using SMP-842. Continued with the 69gr SMK bullets-weights of 24.6,24.8 and 25.0.Primer started to flatten with 24.6 and 24.8-no reason to try 25 grs. Grouping was mediocre-1.7" to 2.25".Will settle on 24.5grs/842 before trying a 60 gr A-max developing project.