Thread: Reload 308 using magnum LRP 2208 powder vs standard LRP 2206H

I understand 2206H abit faster than 2208 using the same primer. But if changing to magnum primer, will it fill in the gap of 2208 volecity?

no

what gr projectile are you using?

155gr sierra matchking

Greetings,
AR2208 is easy to ignite, especially with LRP in a .308 case. Magnum primers give no advantage and possibly less than that. My go to powder in the .308 is AR2206H and has been for some years. Previously Dupont IMR4064 was used that resulted in compressed loads and most top loads of AR2208 are likely to be compressed in many cases as it is a little slower from my tests. IMHO AR2206H is a better powder for the .308 for most applications.
Regards Grandpamac.

Originally Posted by brick118

I understand 2206H abit faster than 2208 using the same primer. But if changing to magnum primer, will it fill in the gap of 2208 volecity?

Just do the normal load development with the Mag primers work up from a couple of grains under max the magnum's may give a ittle more pressure,
My moderfied Omark 44 with a True Flite 30" barrel with is favourite load of 2206H will kick a 155 SMK to 3009fps never got that fast with 2208.

Here are some results from an unidentified powder in a Barnard action. 155 grain Nosler Custom Competition... similar to the Siera match king
This wasnt an ADI or equivalent powder


LOT A CCI200 Primer 48 grn powder seat depth 2.200 Jump .0525 Vel 2950 fps Es 25 fps
LOT B CCI250 Primer48 grn powder seat depth 2.200 Jump .0525 Vel 2954 fps Es 13 fps
LOT C CCI200 Primer 47.6 grns powder seat depth 2.2050 Vel 2953fps Es 53 fps
LOT D CCI250 Primer 47.6 grn powder seat depth 2.2050 Vel 2915 fps Es 20fps
LOT E CCI200 Primer 47.6 grn powder seat depth 2.2165 Vel 2914 fps Es 37 fps
LOT F CCI250 Primer 47.6 grn powder seat depth 2.2165 Vel 2957 fps Es 44 Fps

Take a careful look at the information, mostly I had lower ES with the magnums and higher velocity. It was all chronied on a magneto and averaged for 5 shots
Another thing it shows is the corelation between seating depth and velocity ( pressure)
Also the flip from lots c and d i never did bother to do a retest of that, I stuck with the 48 grains and magnum primers.

Traditionally, probably at least 85% of NRA fullbore shooters used 2208 with 155s. When I used to shoot "sling" as the Americans call it, I actually used the (now obsolete) 2206 which was a bit faster burning than 2206H. Load was giving 2940 with moly'd Mk.2 Sierra 155s in a 30" barrel. Wasn't a hot load as one batch of about 450 brass saw the barrel out, just over 5000 rounds.