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Posted: 2/18/2013 7:05:58 AM EDT
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Hi Guys
I just took delivery of a new RRA 458 Socom and was lucky enough to have a Starline box of brass stashed along with bullets I use in other applications so I'm ready to start re-loading this caliber. I've been re-loading for about 40 yrs but the Socom cartridge isn't used by enough people to be noticed by the mainstream powder houses: So here I am "hat in hand" trying to mine the knowledge of the "variant" crowd. I've got H4198, H322, RE-7 and some IMR 4895 on hand that I'd like to use even though some others may be better ( local gun shop powder shelves look like Locust have been through!) My cases are trimmed, flaired, primed and dummy rounds tested for function by hand. I'll be loading 350 gr Speer SP MT's as well as 350 gr Hornady FP's. If anyone has some actual experience with these components I'd sure appreciate the benefit of your work. I've found the Teppo Load data as well as some Quick load hypothetical stuff but none for the bullets I intend to use. I can extrapolate from the existing data but I know someone already has ,so... thanks Littlejohn |
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I don't think H 322 and IMR 4895 are what you want and don't have any records of anyone else using them, I'd save those for something else.
I've used lots of IMR 4198 and it's my favorite powder for the 350 grain bullets (36 to 37 grains with 36.5 being just about perfect), but have not used H 4198 and I don't have any records of anyone else trying it with these bullets either. A few people have used it with other bullets and are getting good results, but there just isn't as much information out there yet for this one. If you know what you're doing and are willing to work up your own loads, I'd start around 35 grains and work up carefully from there. With Reloder 7, CCI 350 primers and the Hornady 350 grain FN bullet seated to a COAL of 2.05": 35.5 grains = 1,464 fps 36.0 grains = 1,489 fps 36.5 grains = 1,494 fps 37.0 grains = 1,532 fps 37.5 grains = 1,544 fps 38.0 grains = 1,583 fps Best accuracy was at 36.5 grains, and this was from a RRA 16" barrel with carbine gas. As always, you have to work up your own loads and check for proper functioning and any signs of excessive pressure, but these loads have worked for me. I haven't tried the Speer 350's yet, the same powder charges would apply but just watch your seating depth as they are slightly longer than the Hornady's. |
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Forester
thanks for the data, that really helps. While working up my bench dummy rounds for function I found I could seat the 350 Hornady's out to 2.075 before extraction gets sticky and even though the speer 350 is considerably longer I can seat them out to 2.144 because the ogive is actually below the cannelure and this seating still leaves several thousands space from the lands. all feeding was done from a mag and was slick. guess every chamber is different and the throat in my barrel may be a little longer than yours thanks again---if anyone has additional info I'd appreciate it Lj |
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