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long throated .270 wsm advice

 
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  #1  
Old 03-05-2008, 09:47 PM
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long throated .270 wsm advice

Hi
i have a tikka t3 .270 wsm, and use it for mid range sika and red deer hunting here in new zealand, i have recently started handloading for it, and need some advice, the rifle has a very long throat, and i am having trouble getting the listed velocities out of it, can anybody help me with this? i am using ADI 2209/H4350 and Adi 2225/Retumbo, the most i am able to get with the ADI Max listed loads is 2950 with the 140 gr accubond, i would also like to work up a load for the 150 sst, any help or suggestions would be greatly appreciated, i have been told to keep working up the loads and use the velocity as my guide, is this true? the primers on factory loads are more flattened than my handloads, and i am getting no pressure signs whatsoever.
any help will be appreciated
thanks in advance
Gary
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  #2  
Old 03-06-2008, 12:55 AM
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Look both ways before crossing

I'm a yank who owns a 270WSM . But mine is a Win Mod 70. Bullet seating depth in relation to rifling lands is critical ( Closer the better) But no doubt your not exceeding the functioning of magazine. So 4350 is a good start for 140 gr bullets .What is your charge? What book are you going by? So no pressure signs? Well then start increasing untill you get pressure signs ,just simply increase loads cautiously ever watching. I load 68.2 grs of Re#19 for 110 V-max I blew a primer out with this load in the field,so what!!!! Retumbo is way to slow.
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  #3  
Old 03-06-2008, 10:28 AM
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Gary,

Iron Workers advise is good. I also own a 270 WSM with a long throat. I can not get the listed velocity using the loading manuals as a guide. I was using IMR-4350 and getting only 3050ft/sec with Nosler 140 Accubonds at the max load listed in Nosler Manual #5. I switched to RL-22 and slowly moved up the powder charge. I am now getting 3150 ft/sec but I am over the max listed for RL-22 using a 140 grain bullet. However, I have no pressure signs and I can reload my brass many times without neck splits or stretched primer pockets, so I am not worried about the pressure.

According to Nosler Manual #6 you should be able to get 3200 ft/sec out of a 24 inch barreled 270 WSM using three different powders (Magnum, Viht N170,Magpro) I don't know if you can get either powder. I am very pleased with RL-22 for both accuracy and velocity. You might try it if you can get it in New Zealand. Good luck.
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  #4  
Old 03-09-2008, 03:41 AM
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Join Date: Mar 2007
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Hi
I am using 59 grains of 2209 , which is equivalent to H4350, the adi powders are the most easily available over here, and i am going by the ADI Manual, i am one grain over the max allready giving me just on 3000 ft/s on my chrony with a 140gr accubond and ssts with consistant MOA 3 shot accuracy at 100 yards. I also have a tin on ADI 2225, which is supposed to be the equivilant of retumbo and RL 25,how will this powder perform? how fast should i be able to drive a 150 grain bullet out of this rifle? also, i have a leupold vxIII 2.5-8x36 on this rifle because i do a lot of walking up mountains, do you think i will be able to 'click up' for distances to say 500 yards? will i have enough energy out there? (My longest shot so far was some feral turkeys with it at 300 yards),
thanks
Gary
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  #5  
Old 03-09-2008, 10:27 AM
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Location: Blackfoot, Idaho
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Not to hijack the thread, but 270 related.

I get a kick out of the problems with the 270 WSM in practical use. I've shot a 270 Win for many years. In a 24" Douglas barrel the 130s and 140s were loaded to 3190 fps and were what I considered max loads. But I still got 10 to 20 firings per case.

When that barrel wore out it was replaced with a Lilja 27" number 4 contour. It shoots the 140s at 3200 fps. It could go faster but I stopped at 3200 as I figure that's fast enough for a 270 Win. Jury is still out on case life but is at 5 so far.

Accuracy of the Douglas was 3/4 MOA accuracy of the Lilja is beyond description that is, you wouldn't believe me if I told ya.

The Norma powder 204/205/MRP gave best velocities with lowest pressures. However due to its unavailability I went with 4350. Pressures were high and case life short.

RL-22 turned out to be the best available both accuracy wise and pressure wise. Also I use a non-magnum primer which made the most difference in accuracy.

Just chiming in.
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  #6  
Old 03-11-2008, 06:02 PM
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Factory ammo

ok so i had a range session yesterday, i shot rounds loaded with winchester cases, federal 210 primers, 58gr of 2209/H4350 and a 140gr sst seated to just fit in mag. i got an average of 2939 fps, with an extreme spread of 51 fps. cases look fine, primers were ok, not as flattened as my factory ammunition, but accuracy was very average, around 2MOA i shot winchester 150gr power points for an average of 3169 fps and an extreme spread of 19 fps with 1MOA . what powders would people suggest to clone this load? should i continue working up my handloads a half a grain at a time? im hoping for 3250 with the 140gr accubond, and sst.
thanks in advance
Gary
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  #7  
Old 03-13-2008, 07:16 PM
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Location: Reno Nevada
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W-W factory stuff didn't blow up your rifle.

Yes continue increasing your powder charges by 1/2 gr. Hey you will have other pressure signs that can't be ignored before you turn your rifle into a bomb. If you blow out a primer your way too hot,but still a significant distance from blowing up your rifle.2,950 fps for a 140 gr bullets is dang slow.
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