Loading for 30 Luger 6 in barrel - early days - testing powders

[Sieger]

Originally Posted by Kiwi

Part II.
Forgot to mention in prior post my appreciation for Sieger's post on O.A.L. I measured the Previ cartridges at 1.146 a little shorter than Spec 1.175. I loaded mine to as close to Spec as I could measure with my vernier 1.172.


Off to the range with 5 rounds loaded with Herco 4.8 to see if it cycles, and a two sets of 3 SR7625 loads going down from the successful 4.2 of last week.

Results:-
The Herco produced a 1.5 by 0.5 group with holes overlapping.
The SR7625 loaded with 4.0 did not feed well and did not group well
With 3.8 did not feed well and also had a FTE

Takeaways – more Herco to come and will try 5.0 as 4.8 is very light compared to factory.
Will try the SR7625 at 4.5 for accuracy.

So much fun

Kiwi,

It is good to see my practical advice being used as such. Thanks!

If I were you, I would stick with the Herco powder, as is seems to be in the perfect medium/slow burning range preferred by both 7.65 and 9mm Lugers.

Is the 4.8 grain load you listed the minimum load that will hold open your action upon firing? If so, with a full magazine of
8 rounds, latter up your test charges 1/10 of a grain at a time until you reach minimum group size, or, out run your springs (I'm guessing the range to be 4.8 to about 5.6 grains of Herco).

Hope this helps!!


Sieger