Load Density Changes With Different Brass

[ZacNap]

I've been reloading Barnes TTSX 180gn into Hornady brass with 47 gn of IMR4064 but i ran out of the Hornady brass and I'm now using Federal brass and I found the load is almost becoming compressed in the federal brass. Should i change the powder load? Will there be huge pressure ? I would say the density in the Hornady brass is 95% and in the federal is closer to 98% to 99%

The Federal brass is 1 fired, sized and trimmed

thanks

 

[OldDude]

If I were in your shoes, I would start the load development all over for the FC brass.....
You're seeing first hand what a lot of guys talk (and read about) - variations in capacity of different brands.

If you've got an accurate / consistent load with one brand of brass, doing the load testing will likely get you to the same level with another brand.
I noticed a difference of 0.8 grains between two different brands of .308 Win brass recently.

Stan

 

[Fassteel]

Start over please. FS

 

[ZacNap]

Start over please. FS

That's what i was thinking i just didnt want to i jumped the boat a bit an already loaded 25 with that recipe, i didnt spend much time developing this load i made a large batch with different OALs and found what one was most accurate and then went from there i started the powder in the middle of the road between min and max...

 

[bigedp51]

Below are two Quickload charts with the same load of 25 grains of H335 in two cases varying 1.8 grains of H2O in case capacity

Below a American military Lake City 5.56 case with 30.6 grains of H2O capacity

Below is a Israeli 5.56 case with 28.8 grains of H2O capacity

The difference in case capacity of 1.8 grains caused over 6,000 psi difference in chamber pressure.

 

[ZacNap]

ya i decided to pull all the bullets looks like il be hunting with some boxed ammo vs my handloads better to be safe then sorry


thanks again for all the advice

 

[Dogleg]

That's what i was thinking i just didnt want to i jumped the boat a bit an already loaded 25 with that recipe, i didnt spend much time developing this load i made a large batch with different OALs and found what one was most accurate and then went from there i started the powder in the middle of the road between min and max...

I think you're going to end up pulling them down, but something else you could do is load a series of lighter loads, and see how they do on your way back up. Federal brass is soft and cant take the pressures that some others can.



Are you shooting 30-06?