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240smk's in 1:10 barrel

 
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  #1  
Old 12-20-2004, 03:09 PM
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240smk\'s in 1:10 barrel

I posted a few weeks back in the buy/sell section looking for some 240smk's for my 300WM. I got them a couple of days ago (THANKS LEN!!!) and shot my ladder test yesterday. Even brought the girlfriend along to distract me between shots. I had wondered if these would stabalize... and stabalize they did. My highest node was a 4 shot cluster measuring 1.020 @300 yds. Not too shabby for a hunting rifle Imo. I don't have access to a chrony full time, so ill wait to get the velocity until after ive picked the load. Book says about 2650.The paint is drying on my 8x8 portable target stand... should be interesting to see how many of those smk's find their make at 1400 on thursday. Once again thanks len for the help, and for this wonderful site!!
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  #2  
Old 12-20-2004, 03:30 PM
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Location: Palmer, Alaska
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Re: 240smk\'s in 1:10 barrel

2650 from a 300 wm. What length bbl?

The 240 will go subsonic at 1150 yards with a MV of 2650.

In case anyone may wonder, they will not stabilize in a 11 twist at 2900-3000 fps. That was with 85-90 gr Retumbo in the 30.5" bbl 30-338 Lapua Imp.

From memory they printed around a 14" group at 400 yards, and all went through the cardboard sideways.
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Brent Moffitt
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  #3  
Old 12-20-2004, 09:29 PM
 
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Re: 240smk\'s in 1:10 barrel

abinok
I'll be looking forward to your report about how they did at 1400. I have a 300 RUM w/ 1-10" twist and was hoping they would do good out to 1500yds. I've shot them at an estimated 2800fps at 300yds and for two three shots groups averaged 1.1875" and one at 600yds for a 3.8" group, slightly windy and I rushed the shots as it was getting late. Barrel has 28rds thru it and when time permits will up the charge to try and reach 2900fps.
Thanks in advance for the info,
Wayne
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  #4  
Old 12-21-2004, 11:18 AM
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Re: 240smk\'s in 1:10 barrel

2650 from a 300 wm. What length bbl?

Im using a 26" barrel. Like I said im basing that velocity on book data since I don't have a crony full time. Im looking at the sierra manual and they list data to 2700 wih h4871sc. I use this same powder for my "fit in the mag load" for my 220smk's the book says 2700 for the load im using. I get 2733. Ive gone faster with h1000, but the h4831 just seems to shoot better if im seating bullets deep.

The 240 will go subsonic at 1150 yards with a MV of 2650.

Running the .711 bc (ive seen that #listed commonly and its what sierra uses for their first velocity level) at 2650 on the sierra infinity program with my locl conditions (im at 1330ft asl) It says subsonic at 1580. Ive also got the horus vision program, and the old "ballistix for windows" and they all agree on that distance within 15yds. Were you using sea level?

From memory they printed around a 14" group at 400 yards, and all went through the cardboard sideways.
Ive only shot these at 300, but they all cut clean holes. I did notice that they have quite a bit more flight noise than the 220's ive been using. Kinda makes me think of artillery [img]/ubbthreads/images/graemlins/grin.gif[/img]
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  #5  
Old 12-22-2004, 07:44 AM
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Re: 240smk\'s in 1:10 barrel

I've shot the 240s in my 1 in 10" twist also and got excellent results. Nice clean holes and good groups. Velocity was at about 2650fps also but I think that could be bumped up a little as I wasn't using a near max load. With a RUM I think you could add a couple of hundred FPS.
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  #6  
Old 12-22-2004, 11:45 AM
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Re: 240smk\'s in 1:10 barrel

Thanks for posting rod
I figured id post since I hadn't seen anybody posting about this twist bullet combo. I can only assume that the twist that sierra lists is geared toward those shooting in lower elevations and temps.
It just snowed here, so itill probably be mon or tues before more bullets fly.
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  #7  
Old 12-22-2004, 01:02 PM
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Re: 240smk\'s in 1:10 barrel

Just some more info that I forgot and got reminded of in your post, I'm shooting mine at sea level as I live on the coast and the temps were in the 50-60s when I was shootng them.
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