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.300 RUM reloading ?????'s

 
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  #1  
Old 09-29-2005, 10:14 PM
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Location: Houston, TX
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.300 RUM reloading ?????\'s

Hey guys....I have been shooting the 180gr Sierra Match Kings HPBT's.......I'm happy with them, but what a little better stability at 1000yd plus. I was thinking of going to the 200 or 240 SMK HPBT's. Has anyone used these at LOOONG range, and if so comment on stability comparison. Also, I'm using H1000, can you give me the Min/Max powder load for each bullet, and then what you found to be the most accurate.
thx
jordan

captjordan@juno.com
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Old 09-30-2005, 05:59 AM
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Re: .300 RUM reloading ?????\'s

I'm curious, why do you feel your rifle isn't stabilizing the bullet at 1000yds? Unless you have an oddball rifle twist, I can't imagine that it won't stabilize the 180s, even out to 1000yds.

Did you mean to say they aren't as accurate at 1000 yds? If this is the case, what are your groups at that distance?
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Old 09-30-2005, 06:06 AM
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Re: .300 RUM reloading ?????\'s

My groups are around 3-4" at 600, 6-8" at 800, and 12-14" at 1000.........so, it seems to be getting larger groups at distance disproportionally. Also, the bullet holes appear to be very slightly oblong at 1000yds, hinting that they are becoming unstable.

Anyone out there shooting the 200, 220, or 240 at distance........is it more stable? Are the groups good? Are they dropping like rocks though, since they are so heavy? What powder charges would you suggest for H1000 min/max, and finally for accuracy.
thx
Jordan
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Old 09-30-2005, 07:13 AM
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Re: .300 RUM reloading ?????\'s

Here are a couple different loads from reloadersnest.com it has alot of load data, how dependable I don't know. Hope it helps. Both of these loads looked to be closer to the min. powder amt. But check reloadersnest.com for yourself and make sure.

Load 759 in caliber .300 Remington Ultra Magnum


Bullet Sierra Matchking
BulletWeight 240 grs
Powder Hodgdon H1000
PowderWeight 85 grs
Primer Federal 215
Brass Make Remington
Barrel Length 26 (inches)
C.O.L (inches)
Velocity 2770 fps
Group 0.32 (inches by 3 shot at 100 yds)
Submitted Date 3/11/2002 1:26:00 PM


Load 758 in caliber .300 Remington Ultra Magnum

LoadID 758
Bullet Sierra Matchking
BulletWeight 240 grs
Powder Hodgdon H1000
PowderWeight 83.5 grs
Primer Federal 215
Brass Make Remington
Barrel Length 26 (inches)
C.O.L (inches)
Velocity 2727 fps
Group 0.433 (inches by 3 shot at 100 yds)
Submitted Date 3/11/2002 1:26:00 PM
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Old 09-30-2005, 08:09 AM
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Re: .300 RUM reloading ?????\'s

The 200MK's have the rep of being the worst 30cal Mk in the line. They weigh 5gr more the 175gr but have the same BC. I wouldnt shoot less the the 220gr MK in a 300RUM. The heavier bullets have a better BC, so there not "dropping like rocks" at LR. They have less drop. And less wind drift.

I shoot the 220grMK but use Retumbo so I cant help you there.
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Old 09-30-2005, 10:26 PM
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Location: Houston, TX
Posts: 132
Re: .300 RUM reloading ?????\'s

Thanks for the quick responses guys.......With all the cool info you have provided, and the research I have been doing, I'm down to TWO main choices:

220 gr SMK HPBT
91 gr H1000
3004 fps
.236" avg group

or

240 gr SMK HPBT
85 gr H1000
2770 fps
.3" avg group


Now, here is my simple question. Am I better off with the 220's that are faster and lighter at 600-1000yd ranges, or the heavier, slower 240 gr.? Which has a better ballistic coefficient, and will that hold constant no matter what range? Can you give me a quick overview of the ballistic coefficient.....
thx
Jordan
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  #7  
Old 09-30-2005, 11:36 PM
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Join Date: Jul 2005
Location: East TX
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Re: .300 RUM reloading ?????\'s

Keep in mind the following:

I used Sierra's published bc, 100 yd zero, STP for me in East TX, a ballistic prog that gives me a drop chart within 0.5" of impact out to 535 yds with my 300SAUM, and all other disclaimers I didn't remember to list. (10 mph wind)

220SMK
range/fps/energy/elev/drift
600yd/2160/2279/10.7MOA/3.0MOA
800yd/1914/1789/16.8MOA/4.3MOA
1000yd/1687/1389/24.2MOA/5.7MOA

240SMK
range/fps/energy/elev/drift
600yd/2053/2246/12.4MOA/3.0MOA
800yd/1841/1806/19.3MOA/4.1MOA
1000yd/1645/1442/27.4MOA/5.5MOA

Hope that clears the water for you.
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