Just ordered some 138gr. Hammer HHT for my .308 Win

[Eric H]

Seems like no better time. I'm using Fed GMM brass as well.

Even if these work out as a great load, I'll still work up another load with Varget. TAC is temp sensitive. https://ultimatereloader.com/2022/04/01/extreme-powder-temperature-testing-varget-vs-tac/

 

[FireFlyFishing]

Even if these work out as a great load, I'll still work up another load with Varget. TAC is temp sensitive. https://ultimatereloader.com/2022/04/01/extreme-powder-temperature-testing-varget-vs-tac/

I tried running varget on Barnes 130 TTSXs and there's a case volume issue. I could get nowhere near Barnes's published loads without extremely compressed loads.

I think that's why Benchmark has been suggested previously. Faster burning with lower case volume. Plus, it's in the Extreme line of powders.

Food for thought.

 

[Eric H]

I've got benchmark as well.

 

[Eric H]

I've got benchmark as well.

Went with Benchmark and worked up a great load with single digit ES and SD.

 

[FireFlyFishing]

Went with Benchmark and worked up a great load with single digit ES and SD.

Did you have a compressed load?

 

[Eric H]

No. 43Gr Benchmark. 2.202 BTO.

 

[jlarose85]

No. 43Gr Benchmark. 2.202 BTO.

Did you get any velocity numbers off this load?

 

[Eric H]

Did you get any velocity numbers off this load?

 

[Eric H]

Got good groups with TAC and then tried BenchMark. Both gave good groups; .3 with TAC and .6 with BM. May try a faster powder. Maybe 8208.

 

[FireFlyFishing]

What length barrel?

 

[Eric H]

What length barrel?

20"

 

[Eric H]

Hope to get .3 with a temp stable faster powder.

 

[FireFlyFishing]

Hard to argue with a good group, but I'm thinking you should be able to get ~400 fps more. That's quite a bit to make it very flat shooting and give you more effective range with a mono. Just food for thought.

 

[RockyMtnMT]

Last February we did a load in a Ruger American 308 win with the 138gr Hammer HHT. We tried several powders and settled on Benchmark and a vel of 3050 fps with a small crimp oal of 2.759". We tried Leverevolution, good vel but poor accuracy. Varget was too compressed. TAC had good vel but poor accuracy. Benchmark gave good vel and accuracy.