Conversion of 6mmARC brass back to 6.5 Grendel - Lazy's test results

[lazyengineer]

I thought about that. the appeal being easier and likely more concentric for the fireforming. My next step up though from 6.5mm is 7.62mm, and that's...

[lazyengineer]

I thought about that. the appeal being easier and likely more concentric for the fireforming. Mt next step up though form 6.5mm is 7.62mm, and that's...

[lazyengineer]

Interesting. I would have guessed the opposite since H335 is a little hard to ignight, so would expect a hotter primer would give a more reliable ignition...

[lazyengineer]

Thanks for posting that. Maybe it's not just me afterall. I have my own theory on why it does better with 7.62x39 sourced brass - curious if maybe you...

[lazyengineer]

I think it's a topic that is worried about more often than it happens. I have seen one slamfire as a scorekeeper in high-power competition, so it's not...

[lazyengineer]

Interestingly my best results are with PMC 7.62x39 brass. But that 5 shot (four into 1-hole) group with 7.62x39 consisted of 2 PMC, 2 S&B and 1 Lapua...

[lazyengineer]

Here, order these. GINEX is GtG.

https://americanreloading.com/collec...e-shipping-haz...

[lazyengineer]

Ah Winchester. My days of not taking you seriously have come to a middle.

[lazyengineer]

It was really more for fun and experimentation - I'm not actually poor. And as I note, you can be surprised. My most accurate brass in my Grendels is...

[lazyengineer]

So I took the cracked 6mmARC casing (that did not get my headspace adjustments before firing it)


There's the crack and you can see...

[lazyengineer]

And here's how they did:

The 6.5 Grendel did like 6.5 Grendel and worked OK. Accuracy was... OK. Maybe I was still settling in.
...

[lazyengineer]

Let's do some testing. 30.3 gr Benchmark pushing a 6.5mm TNT 90 bullet at 2.2" OAL

(right)
A - five x Conventional Grendel brass...

[lazyengineer]

I've also posted on this over in another forum, but this is really where it should be. Here's my brass haul from the gong range last week.

...