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240 SMK, H50BMG powder, 300RUM...anyone?

 
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  #1  
Old 09-02-2009, 12:41 AM
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240 SMK, H50BMG powder, 300RUM...anyone?

Anyone messing around with this combo? Be interested in your experiences.

Thanks.
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Old 09-02-2009, 09:48 AM
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Re: 240 SMK, H50BMG powder, 300RUM...anyone?

Close. I have not tried the 240 but I toyed with the 220 and H50BMG for a while in the 300 RUM. I dont remember the exact velocities but the accuracy was very good. I do remember the velocities were decent. I dont know that you would get real good velocities with a factory gun but a tighter, smoother custom barrel will get decent velocities.
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Old 09-02-2009, 10:03 AM
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Re: 240 SMK, H50BMG powder, 300RUM...anyone?

Quote:
Originally Posted by Michael Eichele View Post
Close. I have not tried the 240 but I toyed with the 220 and H50BMG for a while in the 300 RUM. I dont remember the exact velocities but the accuracy was very good. I do remember the velocities were decent. I dont know that you would get real good velocities with a factory gun but a tighter, smoother custom barrel will get decent velocities.

Thanks, ME. I've had a lb. of it for several years. It just didn't produce good velocities with a 200g AB awhile back, but with a 240SMK, it might be right in there.

I had to go to a new 8lb jug of US869 and even reducing my load a bit while fireforming and shooting new cases, I got an ave. MV of around much lower 2940 MV and pressure signs unusual for that reduced load. Must be quite a bit faster burning lot unfortuanately. Thought I might give the H-50BMG another whirl. Would prefer to use and extreme powder anyway--might be less MV change with temp change than US869. I can fit 103g of H-50BMG in my RUM cases just below the neck shoulder junction. We'll see...
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In the beginning God created the heavens and the earth. Genesis 1:1

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God?" Thomas Jefferson - Notes on the State of Virginia

www.wildsidesystems.com - Shelter for Your WildSide - http://www.youtube.com/watch?v=tYwgo...&feature=g-upl
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Old 09-02-2009, 11:49 AM
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Re: 240 SMK, H50BMG powder, 300RUM...anyone?

have you ever done any mountainside testing to compare how the 200, 220, and 240 smks compare at 1500 or more?
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Old 09-02-2009, 12:14 PM
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Re: 240 SMK, H50BMG powder, 300RUM...anyone?

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Originally Posted by yobuck View Post
have you ever done any mountainside testing to compare how the 200, 220, and 240 smks compare at 1500 or more?
Not sure if you're asking me or ME. I've only shot the 240 out to just over 1K. Haven't shot any other MK. With a 240 doing 2940 MV and a hard hold (no brake) I can barely spot my own shots at 1K if it's a dusty hillside. Shot some steel and milkjugs a couple of days ago. Steel at 880 had two out of 4 within 2.5 in of center and just left--ele right on. The other two shots hit, but I wasn't fond of feel of them as I pulled the trigger--about 6" off. Worked at jug at 816 and it stayed safe--couldn't spot my shots at that distanct and the milkjug was just in the shade so hard to see the hits anyway. Working on consistent prone form. Then shot a milkjug at 1017 yds. Fist shot skimmed just over the top, right over the middle. Second nailed the jug nearly dead center after adjusting down .25 MOA from what Exbal had reccomended. 2-3 mph 3 o'clock wind at my location--a bit stronger mid canyon and a wind switch somewhere as the dust on the far side of the canyon was not going the direction I thought i would've. Alot to learn about wind. Shot a couple of times at a jug at judged 1008 (Leica 1200 wouldn't get that far in the sun) and went right over the top middle a couple of times, then aout of ammo. Still working on my getting my prone shooting position 'feel' as consistent at possible--that time of year.
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In the beginning God created the heavens and the earth. Genesis 1:1

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God?" Thomas Jefferson - Notes on the State of Virginia

www.wildsidesystems.com - Shelter for Your WildSide - http://www.youtube.com/watch?v=tYwgo...&feature=g-upl

Last edited by jmden; 09-02-2009 at 12:17 PM.
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  #6  
Old 09-02-2009, 04:48 PM
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Re: 240 SMK, H50BMG powder, 300RUM...anyone?

Well...went out and shot some H50BMG under 240's.

This was quick and dirty. Fired 'em all in less than five minutes up an old logging road. Good lighting conditions, so fairly confident in the chrono numbers. Chrono didn't miss a beat.

I've had this powder probably 4-5 years sitting in the shop. Used some old fired brass (some fired many times--don't have much nice new prepped brass and don't want to damage what I have carefully prepped in wild hair load development at the moment) I had lying around as seems like using new brass always results in less pressure signs showing and lower velocities--sometimes seems like new brass doesn't give the true picture.

Didn't start getting interesting until I got to 104g. Started at 98g in the mid 2700's.

Yes, compressed--haven't done much of that--any pointers?

300RUM, 26", 1-10", approx. 65 deg., ~3.775" COL, seated to lands, FED 215M:

(corrected MV using JBM ballistics for chrono 20' from muzzle)

104g--2932--small hint of ejector pin mark, primer cratered a bit
105g--same--no ejector pin mark at all, primer cratered a bit (almost makes me wonder if I loaded what I thought was 105 at 104, but I was pretty careful--maybe it's just a big node?)
106g--3007--definite ejector pin mark (partly shiny) and cratered primer

Have to get out and mess around with accuracy potential and velocity ES.

Use this info at your own risk. Maybe it'll help someone else out.
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In the beginning God created the heavens and the earth. Genesis 1:1

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God?" Thomas Jefferson - Notes on the State of Virginia

www.wildsidesystems.com - Shelter for Your WildSide - http://www.youtube.com/watch?v=tYwgo...&feature=g-upl

Last edited by jmden; 09-02-2009 at 04:53 PM.
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  #7  
Old 09-02-2009, 10:55 PM
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Re: 240 SMK, H50BMG powder, 300RUM...anyone?

92.5 gr of 50 BMG gave me around 2900 fps with the 240 out of a 28 in Broughton. This is about max in my rifle. 94 gr blowed primers. Be careful folks, there is no way my rig would have held togather with 104 gr. I shot 104 gr under the 190s and that was on the warm side.
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