Anybody load the 70 gr Speer in 223
From what I have read its a sledgehammer for a 224 bullet.
If so, what is your load and chrono data ??
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.
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?
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.
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
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.
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.
Load from a couple of other sites.
24.5 gr H4895 in an AR and 25 gr in a bolt action.
25 gr H4895 2997 FPS with a 24" bbl bolt action.
26 gr Varget 3024 24" bbl.
Some loads from loaddata....
70 Speer Spitz SP Winchester W-748 27.0 3068
Remarks: max charge; primer: CCI 450 Magnum
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