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Old 07-26-2008, 06:36 AM   #1
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IMR 3031 and .308 Win

Anyone here have experience with IMR 3031 and the .308 Winchester? How about any in the 18-22" barrel range?

Does it have any well known characteristics I should be aware of? Does it foul bad like 4064?
 
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Old 07-26-2008, 09:26 PM   #2
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Imr.3031,or Imr.4895

I have had exelent results with IMR 3031 ,and also IMR 4895 those are 2 of the three powders I use the most,my powder mesure does'nt meter them well so I throw lite charges and trickle the rest on my scale.IMR 4064 is what i use in my 358 Winchester,but all my rifles except 1 have 24-26" barrels.
 
Old 07-27-2008, 05:46 AM   #3
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DW 3031 and 4895 are excellent powder choices for the barrel lengths mentioned. but i will admit 4064 should also be on your list of suitable powders for any .308.
 
Old 07-27-2008, 12:24 PM   #4
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Good stuff, Dakoma and NH. I'll have to do some tests.

Intended application is to end up somewhere in the 42<x<43 grs good for 155gr FMJ and 175gr SMKs in an AR-10 at 2700 and 2575-ish and 155 Scenars and 175 SMKs in a bolt-gun at 2800 and 2650-ish.

Got any pet loads with it NH?

The twist on the 22" is 1:11 so it should rev and stabilize the Scenars just fine despite the slightly lower than optimal velocity. If it doesn't I'll be sad.

Both sport an unconventional barrel design. The max pressure with these loads should be around the regular 55,000psi considering aforementioned design and around 58,000psi in regular tubes. The muzzle pressure on both barrel lengths should also be pretty low. I do believe 4895 will burn too fast and 4064 too slow, and haven't really heard of anything between the two other than 3031 from any manufacturer that generates optimal pressures. N135 has less energy per grain and the .308 runs out of capacity to get it to where the 3031 can go; yet anything past 16" (in .308) with 3031 are very small gains/inch.
 
Old 07-27-2008, 07:41 PM   #5
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Hornady 150Gr.BTSP-44grs.of IMR-4895 and Nosler 165 Gr. BT-Ballistic Tip 43Gr.IMR-4064.These are loads for my Mauser rebarreled with a 26" Parker Hale Barrel verry acurate.I dont load any 155 or 175 Grain bullets.Who makes the 175 Grain bullets you are loading?

Last edited by Dakoma; 07-30-2008 at 10:12 PM.
 
Old 07-27-2008, 07:46 PM   #6
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DW i got to checking my loading data for 3031 and the .308. the news ain't going to be good guy from what i've been able to come up with when using 3031 your going to have a problem getting over the 2500 fps mark with suitable chamber pressures. with either 155 grain bullets or the 175's. the 155's you could get about 2700 fps out of safely but the 175's will be stuck in between 2500 and 2600 fps with 3031 due to chamber pressures. now 4895 and 4064 will do what you want, your barrel length is not an issue with either powder they will burn up in the first 6"'s of barrel anyway. the only issue that i would see is that the loads need to be tailored for the gas gun then used in the bolt gun. the ar-10 system will handle more pressure than the m-14 style systems but not a whole bunch more like the bolt gun will. if your going to be shooting at long range say to 1k, you mite try looking at bergers 168 bullet or hornadays 168 a-max. they both can be kept ballistic at 1k and getting to 2650 to 2700 fps with either will be a lot easier the with the 175's. get on google and look up JBM ballistic calculations it will give you a world of useful data, along with rang cards that you can tailor to your specific gun and load. the 175's are good in the wind but not enough better that sacrificing your weapons life to get the few extra inches out of it. one of the best ways with a gas gun to tell when pressures are getting out of control is are the cases getting dirtier as the chamber pressure goes up. this works with all of the gas impenged guns and is a really good maker with the .308 round. the .308 round is famous for not letting you know there's a pressure problem until the pressure gets really stupid high. back to the 3031 though it looks good on paper but in real life i find it to be a different story. a good starting point for you could be 41.0 grains to about 44.0 grains of 4895, your mileage may vary due to your rifles chamber but i would think somewhere in there you'll find what your looking for. try the 168's i know what people say about them but there not always telling the truth. the serria's won't work for anything past about 700 yrds is a fact though, the hornaday and berger 168's though will be good out to 1k+ depending on your load. let me know what you think guy.
 
Old 08-17-2008, 06:00 AM   #7
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SMK stands for Sierra Match King. Scenars are made by lapua. I haven't tried 155's in lapua or berger yet but I hear good things. I have a bolt rifle and have never reloaded for a semi-auto. I use Varget and have gotten very good results with the 155 smk. I don't know what results you would get in a semi auto.
 
Old 11-18-2008, 05:28 PM   #8
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I use 3031 in my '06,... with good results, very predictable. I have been working up some loads, and also using hodgdon BL-C(2). It is a ball powder, that is a bit slower than the 3031, and should work pretty good for the .308. The data that I have shows it throwing a 150 grain out at 2915 max, and the 3031 at 2942 max. Since it is a ball powder, it will meter really accurately.
Now, if you wish to have some interesting loads, try the BL-C(2) at the starting charge in the '06. The results I get are very similar to shooting black powder. You get a delayed fire. Now for the bad part, I produced a very nice .17" group at 100 yards with this load... and it really isn't something that I want to use.... Probably isn't to good for the rifle either...
 
Old 11-30-2008, 07:55 AM   #9
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I stopped using IMR 3031 in .308 & .30-06 back in 1986 as I found that it didn't meter evenly through the equipment that I had. I switched over to IMR 4895 and have never looked back.
 
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