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tammons
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Posted: 9/5/2011 9:34:40 AM

Anybody load the 70 gr Speer in 223

Link below.
From what I have read its a sledgehammer for a 224 bullet.

http://www.midwayusa.com/viewProduct/?productNumber=126472

If so, what is your load and chrono data ??

Thanks
borderpatrol
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Posted: 9/5/2011 10:48:20 AM
Because of the blunt nose shape these bullets need a relatively short overall length. This may not be an issue with a 5.56mm chamber. Make sure your loaded round does not jam into the rifling. Because these need to be loaded so deep for SAAMI chambers the result is the bullet consumes a lot of the powder capacity.

Don't expect the great wind bucking ability of similar weight match bullets. 68 through 77 grain match bullets fly much better in the wind.
magoo1
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Posted: 9/5/2011 12:58:02 PM
For my keltec su-16 with a 1:9 and a 5.56 cut chamber they work very well. I do not have a crony, but using benchmark with WSR primers at or near max load of 23 gr seems to work very well at 100, 200 and 300 yards . I also use a COL of 2.25 as I like to shoot out of a mag. I could go longer with single feed, but too lazy. At the same time In my home town of Lewiston Idaho with the factory a half mile away I can only find these at the local shops every Five to six months?
Wingman26
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Posted: 9/5/2011 3:19:56 PM
If your barrel has a 1 in 9 twist you might have a problem with stabilization with that heavy a bullet, a 1 in 8 twist will normally work fine in that weight range. The only way to know for sure is to try it.
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Scott_R
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Posted: 9/5/2011 5:44:46 PM
magoo1, what is the length of this bullet?

Length of the bullet is a factor in stability, not weight.
People usually refer to weight because heavier bullets are generally longer, and THAT's how we buy 'em .

I'd like to try this bullet, too.

Here is my favorite bullet twist rate calculator using the Miller Stability formula.


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magoo1
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Posted: 9/6/2011 2:56:48 AM
Hello, after pulling out 10 of the Speer 70 gr. sp. bullets out of a box of 60 at random, they measured on the whole + or - around .775 in length. I hope this helps
Scott_R
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Posted: 9/6/2011 6:55:03 AM
[Last Edit: 9/6/2011 7:01:05 AM by Scott_R]
Thanks!

I tried to post the results of the calculator above, but it plays havoc with the editor.

Suffice to say that it shows this bullet should be stable in a 1:9.

I tried from 2500 ft/s to 3000 ft/s and temperatures from 20 to 90 F.

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tammons
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Posted: 9/6/2011 7:37:36 AM
[Last Edit: 9/6/2011 7:38:57 AM by tammons]
I just picked up a 1:7 twist upper mostly to shoot the 70 gr TSX but then I found these bullets that are a lot cheaper
and supposedly sledgehammers.

Also have a 1:9 twist savage and from what I have read they will stabilize in a 1:9 twist.
COL from other sites was 2.2

Quickload lists the bullet as .808" long. Have some on the way to verify.

FYI

Load from a couple of other sites.
24.5 gr H4895 in an AR and 25 gr in a bolt action.

Reloadersnest

25 gr H4895 2997 FPS with a 24" bbl bolt action.
26 gr Varget 3024 24" bbl.

Some loads from loaddata....

22" bbl
70 Speer Spitz SP Winchester W-748 27.0 3068
Remarks: max charge; primer: CCI 450 Magnum

Hodgdon data

All 24" bbls
70 Speer SP IMR IMR-4320 24.3 2799
Remarks: COL: 2.140"; 52,900 psi
70 Speer SP IMR IMR-4064 23.5 2831
Remarks: compressed load; COL: 2.140"; 53,300 psi
70 Speer SP Hodgdon Varget 26.0 3024
Remarks: COL: 2.140"; 48,400 cup
70 Speer SP Hodgdon BL-C(2) 26.5 2954
Remarks: COL: 2.140"; 50,800 cup
70 Speer SP IMR IMR-4895 24.5 2917
Remarks: compressed load; COL: 2.140"; 52,300 psi
70 Speer SP Hodgdon H-335 23.5 2867
Remarks: COL: 2.140"; 47,900 cup
70 Speer SP Hodgdon H-4895 25.0 2997
Remarks: COL: 2.140"; 50,500 cup
70 Speer SP IMR IMR-3031 21.2 2729
Remarks: COL: 2.140"; 50,900 psi
70 Speer SP Hodgdon Benchmark 22.8 2869
Remarks: COL: 2.140"; 51,000 cup
70 Speer SP Hodgdon H-322 23.0 2962
Remarks: COL: 2.140"; 51,200 cup
70 Speer SP IMR IMR-8208 XBR 21.8 2797