.308 230 grain berger hybred load data?

I've not used them to load for specific conditions, however, I have used them to determine the temperature bounds of OCW nodes.

If you repeat the test, you may not want to go as high as I did in temperature if you suspect the powder is not temperature stable. I logged pressures above 70k psi running this test with RL-25 in my 6mm.
 
that is a good test to do, should be really interesting...but...

let say you have a node between 2650 and 2700fps, 20deg C, 46gr of powder. How do you keep tracking the amount of powder required to keep between your node specifications ? I think you need to establish the correlation you did but for all charges you may encounter like 44,44.5, 45, 45.5 , 46, etc.... Then you can duplicate speed and amount of powder in a given temp.
 
I wish AR Comp was a bit slower. When I tested it, I had an SD of 6 for the 15 rounds combined, over the three different temperatures.

The other powder that I have tested that was super stable was H1000.
 
There is one double base not so popular for lighter bullets which is Power Pro 2000. For the 185 in a 308win, its an absolute rocket on fire. I manage to push a 130JLK out of a 47L at 3130fps without even a little sign of pressure....and for the 185...close to 3000fps !!!!!!!!!!!!!!!!!!!!!

The burn rate is just not there for the 200-215-230 bullets though (((
 
One of the guys on the Hide tested it. Stability was similar to RL-17.

2000MR_Temp_Test.jpg
 
WG300 said:
that is a good test to do, should be really interesting...but...

let say you have a node between 2650 and 2700fps, 20deg C, 46gr of powder. How do you keep tracking the amount of powder required to keep between your node specifications ? I think you need to establish the correlation you did but for all charges you may encounter like 44,44.5, 45, 45.5 , 46, etc.... Then you can duplicate speed and amount of powder in a given temp.
Click to expand...

I test Temp Vs powder charge/vertical. it is a bunch of fussing and careful note taking but you see trends relative to temp and powder charge. Assuming you aren't clouding data due to varying winds, you will see a trend as temps change.

This year has been really "good" for temps varying all over the place. got to test in both hot and cooler temps

The key is being able to replicate your results for a given temp range. If the powder and your data is working properly, it is repeatable and predictable. If you just have a fussy combo, then it will just drive your nuts with large variations in groups and tuning.

I have shied away from ball powders cause they seem to be even more temperamental vs temp. Sure, some can go fast but going out of tune during a relay is a pita. Also, some combos will go fast but if the grouping can't hold the 4 ring, not much use either.

So far, I haven't found a powder/combo that has proven to be both accurate/stable and fast.

But I have only just begun this journey.

Note that some combos go WAY out of tune when temps get hot. They stop being linear at higher pressures when ambient temps are high.

Jerry
 
Maybe we just need to keep our match ammo in an underarm pocket so the ammo temp remains constant to our body temp. Hey, it's self regulated and unless you're sick - it's real consistant.
 
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