Was doing a bit of precision testing yesterday and had some interesting results with Hornady Superformance Match 223. 75gr BTHP.

 

 

 

Rifle used was a RRA 1/8 twist, 18", Mid-Length Stainless barrel profiled to .750

 

 

Range was 100yds... 84 degrees 71% humidity winds SSW @3mph

 

Velocities obtained from 5 round string using this ammo:

 

1. 2812

2. 2804

3. 2784

4. 2744

5. 2739

 

Round One and Two started having pressure signs... primers starting to push out...three and four were pierced primers and the fifth has a "crater" inside the primer strike.

 

 

My firing pin now has a "crater" or pit on the tip. (going to need to borrow a better camera to get a picture of this)

 

Results on the target....

 

And results on the same day using FGMM 77gr and Hornady Match 75gr

 

 

 

Black Hills 75gr, FGMM 77gr, Hornday 75gr TAP and 75gr Match all functioned well with out any issues or signs of overpressure.

 

Going to contact Hornady on tuesday and will update the post with what they say....

 

BE CAREFUL using this ammunition.

It is a shame that this ammo damaged your firing pin. I am curious to see what Hornady says as I think they are a good company.

 

I am surprised that they don't say not to use this in semi autos, as it is just too hot for them.

 

But good shooting on the other groups!

I have read some bad reviews on the Superformance Powder as well. I thought they were not using it in calibers under 22-250 because of the pressures.