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300 RUM, 200g Accubond, H50BMG

 
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  #1  
Old 04-23-2004, 02:50 PM
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300 RUM, 200g Accubond, H50BMG

Hi,

Have folks been using this combination of components with any luck? If so, what are the numbers for your particular rifle, i.e. velocity, powder charge, etc.

Thank you,

Jon Denham
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Old 04-26-2004, 01:29 PM
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Re: 300 RUM, 200g Accubond, H50BMG

I have not used the H50BMG, however I have had very good luck with H-1000 and 200g SMK's. I shot a 3 shot, 4 inch group at 800 yards with 94g of H-1000, velocity was 3197fps, OAL= 3.66".
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Old 04-26-2004, 05:57 PM
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Re: 300 RUM, 200g Accubond, H50BMG

My accuracy load with the 200 grain Accu Bond is:

84.5 grains of Retumbo
Winchester Mag rifle primer
bullet seated to the recommended COL (3.75 I think)
I get 3000 FPS about 3 ft from muzzle
and completely penetrate 1/2" steel @ 100 yards.

I primarily will use this load to hunt moose in northern Ontario
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Old 04-27-2004, 02:37 AM
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Re: 300 RUM, 200g Accubond, H50BMG

Whoops, I misread the topic starter. For some reason I had 200g SMK stuck in my head. I have a very accurate load worked up in my completely stock Rem 700 LSS in 300 RUM and the 200g Accubond. 92g of H-1000, Fed 215, OAL=3.640", 3104fps. I have shot a 1.5" 3 shot group at 525 yards with this load. Shot through 3/8" steel at 525 yards. I also shot my 5x6 bull at 512 yards with this combo. Hit 2 of 3 shots. 1 behind the shoulder, 1 in the shoulder. I only got a couple words to say, it was messy.
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Old 04-27-2004, 02:47 PM
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Re: 300 RUM, 200g Accubond, H50BMG

The little I've shot H50BMG and the Accubond, it does have impressive MV, but in my case groups went to hell. Now, I've only tried one load, pretty near max too, and this is in my 30-338 Lapua Imp not my 300 Ultra, but they are very similar.

I've not tried H1000 either, mainly been having good success with Retumbo. RL25 shoots real well too, just about 50 fps slower than Retumbo though...

91gr Retumbo under a 210 JLK, 210M seated to the lands at 3.897 shot somewhere between .2 and .5 MOA with 3 shots with the first load I tried. This really means nothing to me because I only fired two groups. I'll have to print a few more consecutive ones to see how that holds up.
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Old 04-27-2004, 08:20 PM
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Re: 300 RUM, 200g Accubond, H50BMG

Brent and all,

You tested H50BMG with you 30-388 Lapua Imp., right? What was your powder charge?

It just seems a waste of case capacity to use 90-95 grains of powder with the 200g bullets on such a big case as the 300 RUM. That would indicate to me that a guy should be using a slower powder with that size bullet and fill that case up some more--not compress it, just fill it up. I got ejector pin marks at 93 grains Retumbo and am at 94.4 grains of Re25 for my hunting load. I just think that leaves too much room in the big case and wonder if we're not taking advantage of it due to powder selection in part. Comments?
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Old 04-27-2004, 09:58 PM
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Re: 300 RUM, 200g Accubond, H50BMG

John,
You're right, density seems much more appropriate with H50BMG or one of the slow VV powders.

I tested 100.0, 102.0 and 104.0gr H50BMG. Pressure was about 65, 70, and 75k psi respectively. I consider 102gr a max load.
MV was also 3200, 3250, 3330 fps respectively.

I will play with the load a little more though. Primer, OAL and I'll know if it'll shoot at that speed.

I'm satisfied with 3150-3200 fps using Retumbo if not, accuracy is very good. Like you say though, 90gr is pretty low for this case, but it does seem to work just fine, heck even 84gr RL22 shot real well in the Lapua.

I wondered if RL22 or H4831 would really be too fast of powder, but couldn't resist the urge to see if things really tighten up moving to a little faster burn with less muzzle pressure.

No doubt in my mind that these cases could use more barrel length, especially if even slower powders are used. I think with a 30 caliber we just may have just about maxed out the case capacity for these powders. Maybe 40" barrels with slower than H50BMG would do better??

I think with Retumbo we're already running in the fast burn range, probably why accuracy is what it is in the bigger 30's.
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