Help with testing results

[Pwoller]

Can you guys look over my results and give me some suggestions on where to go with these loads next? These are all with 95 T. rex and new starline brass. Shot through a 12.5 inch barrel AR with a suppressor. I was looking for low sd and decent speed then was going to adjust seating depth to look for accuracy. 2 shots at each charge.

H322
27.0-readings
27.2-2334fps 28.3sd spread 40 - 2 shots
27.4-2418fps 14.8sd spread 21-2 shots
27.6-no readings
27.8-2439fps 2.1sd spread 3 -2 shots
28.0-2452fps 3.5sd spread 5 -2 shots
28.2-2476fps 12.7sd spread 23 - 3 shots
28.4-2488fps 10.3sd spread 20 - 3 shots
28.6-2534fps 7.8sd spread 15 - 3 shots
28.8-2531fps 3.5sd spread 7- 3 shots

8208xbr
28.6-2324fps 18.4sd spread 26 -2 shots
28.8-2363fps sd 0 spread 0 -2 shots
29.0-2387fps 8.5sd spread 12. -2 shots
29.2-2454fps 18.4sd spread 26 -2 shots
29.4-2430fps 14.8sd spread 21-2 shots
29.6-2450fps .7sd spread 1 - 2 shots
29.8-2492fps 5.7sd spread 8 -2 shots
30.0-2518fps 13.4sd spread 19- 2 shots
30.2-2519fps 9.1sd spread 18 -3 shots
30.4-2517fps 13.9sd spread 23 -3shots

Benchmark
27.2-2337 7.1sd spread 10 -2 shots
27.4-no readings
27.6-no readings
27.8-2381fps 17.7sd spread 25-2 shots
28.0-no readings
28.2-2373fps 6.4sd spread 9 -2 shots
28.4-2390fps 19.8sd spread 28 -2 shots
28.6-2548fps no sd -1 shot
28.8-2422fps 4.2sd spread 6 -2 shots
29.0-2555fps 43sd spread 82 -3 shots
29.2-2484fps 20.6sd spread 39 -3 shots
29.4-2542fps 11.9sd spread 23 -3 shots
29.6- no readings

[JASmith]

[Pwoller]

[grayfox]

Graph the average MV's per load into excel for each powder, what do the curves look like?
Post the results, each avg MV data point and the graphs, on here.

Like JA said all you have right now is some load charges with an avg MV per each charge. Use those avgs for the graphs.
One graph line per powder type. Powder load on X axis, MV on Y-axis.

Then I might be able to suggest some load ranges, in those ranges you would do 4 shots at each load for MVs, avg MV and SD. Over a spread of powder loads for some grains, I'll know better when I see your graphs.

Keep the bras at an equal number of firings for each powder, ie, don't use some new brass and some 1x fired or 2x brass. Better yet, use all 1x or all 2x brass if you can. Keep all these other variables at no variance.

[LRRPF52]

H322
27.0-readings
27.2-2334fps 28.3sd
27.4-2418fps 14.8sd
27.6-no readings
27.8-2439fps 2.1sd
28.0-2452fps 3.5sd
28.2-2476fps 12.7sd
28.4-2488fps 10.3sd
28.6-2534fps 7.8sd. When you see a jump like this, take note of it. Could be an indicator of an excursion. You went from 2488fps to 2534fps with a .2gr charge weight increase, which is well outside of the trend from 27.8gr to 28.4gr.
28.8-2531fps 3.5sd

8208xbr
28.6-2324fps 18.4sd
28.8-no readings
29.0-2387fps 8.5sd
29.2-2454fps 18.4sd
29.4-2430fps 14.8sd
29.6-2450fps .7sd
29.8-2492fps 5.7sd
30.0-2518fps 13.4sd
30.2-2519fps 9.1sd
30.4-2517fps 13.9sd

Benchmark
27.2-2337 7.1sd
27.4-no readings
27.6-no readings
27.8-2381fps 17.7sd
28.0-no readings
28.2-2373fps 6.4sd
28.4-2390fps 19.8sd
28.6-2548fps no sd
28.8-2422fps 4.2sd
29.0-2555fps 43sd And here
29.2-2484fps 20.6sd
29.4-2542fps 11.9sd And here

[StoneHendge]

It's impossible to say without seeing accuracy or pressure signs. It's kind of like trying to find a girl who isn't just hot, but who's also fun to be with AND won't turn out to be a {female dog}.

A tight spread could be a statistical anamoly if the dispersion is wide.

[Pwoller]

H322
27.0-readings
27.2-2334fps 28.3sd
27.4-2418fps 14.8sd
27.6-no readings
27.8-2439fps 2.1sd
28.0-2452fps 3.5sd
28.2-2476fps 12.7sd
28.4-2488fps 10.3sd
28.6-2534fps 7.8sd. When you see a jump like this, take note of it. Could be an indicator of an excursion. You went from 2488fps to 2534fps with a .2gr charge weight increase, which is well outside of the trend from 27.8gr to 28.4gr.
28.8-2531fps 3.5sd

8208xbr
28.6-2324fps 18.4sd
28.8-no readings
29.0-2387fps 8.5sd
29.2-2454fps 18.4sd
29.4-2430fps 14.8sd
29.6-2450fps .7sd
29.8-2492fps 5.7sd
30.0-2518fps 13.4sd
30.2-2519fps 9.1sd
30.4-2517fps 13.9sd

Benchmark
27.2-2337 7.1sd
27.4-no readings
27.6-no readings
27.8-2381fps 17.7sd
28.0-no readings
28.2-2373fps 6.4sd
28.4-2390fps 19.8sd
28.6-2548fps no sd
28.8-2422fps 4.2sd
29.0-2555fps 43sd And here
29.2-2484fps 20.6sd
29.4-2542fps 11.9sd And here

I'm using a beam scale with no electronics near it. Its been tuned by Parker. The only load data I could find was the 95 grain vmax so I stopped short of its max loads knowing that the solid bullets could have different pressure then the vmax.

[Pwoller]

Graph the average MV's per load into excel for each powder, what do the curves look like?
Post the results, each avg MV data point and the graphs, on here.

Like JA said all you have right now is some load charges with an avg MV per each charge. Use those avgs for the graphs.
One graph line per powder type. Powder load on X axis, MV on Y-axis.

Then I might be able to suggest some load ranges, in those ranges you would do 4 shots at each load for MVs, avg MV and SD. Over a spread of powder loads for some grains, I'll know better when I see your graphs.

Keep the bras at an equal number of firings for each powder, ie, don't use some new brass and some 1x fired or 2x brass. Better yet, use all 1x or all 2x brass if you can. Keep all these other variables at no variance.

I'm working on this but my graphing skills are lacking.

[Pwoller]

It's impossible to say without seeing accuracy or pressure signs. It's kind of like trying to find a girl who isn't just hot, but who's also fun to be with AND won't turn out to be a {female dog}.

A tight spread could be a statistical anamoly if the dispersion is wide.

Noteable target results: H322 28.4 3 shots close to the same hole. 8208 28.6, 28.8, and 29 2 shots each touching.

I saved the brass in order as well and so I do have that.

[StoneHendge]

I would like around in that low to mid 28 range with H322. It seems to be giving accuracy and velocity consistency at the best velocities, but heed what 52 said. It looks like that 28.4 may be around max . You should be looking at your primers after the first shot of each step. If you've got cratered or flattened primers or ejector marks, that's the time to stop (or at least acknowledge the risk of the next higher charge). Then look at them again when you get home. Fainter signs may get by you at the range.

In a pistol, H322 should also give you less muzzle blast since it's the fastest burning. I have a new 14.5" 5.56 and there's a notable reduction in blast compared to Benchmark.

[Rosecrans1]

Quote Originally Posted by LRRPF52 View Post

Beam scale or not, those look and could be spikes you don't want to revisit.

The 8208sbr between 29.8 - 30.2 would be something to investigate with 5 shot groups. Same at 28.2 - 28.4 with H322. Again, 5 shot groups.

[Pwoller]

Here are the brass pictures for the H322 and 8208 with the 95 trex. This was my first time loading this bullet or any other all copper rounds so I was really looking for the safe loads and not trying to shoot for accuracy.

8208 29.8

8208 29.8 95trex.jpeg

[Pwoller]

8208 30.2

[Pwoller]

h322 28.2

[Pwoller]

h322 28.4