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Another update. Took the .303-.30/40 Krag ammo to the range. Here’s a picture of it, sandwiched between a piece of .303 brass (left) and a piece of .30-40 brass (right). As you can tell it’s a little shorter, but dimensions otherwise look good.
Attachment 326201
It chambered and extracted fine, although occasionally had trouble feeding. Dunno if it’s the case length, OAL length, bullet shape, or something mechanical. The 180 grain .313” rounds also seemed to work fine, and grouped close enough that I feel confident I can work up a load.
The only issue was the brass came out sooty. Too low pressure is my guess. 34.9 grains H380, the starting load from this manual:
Attachment 326202
This manual suggests a starting load of 42.0 grains:
Attachment 326203
Guess I’ll start with 36.0 grains and work up from there.
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The Remington 180 gr RN bullet in the .303 British factory loads was available as components back when I had my first Krag. They measured .310” and shot better than .308” bullets.
I don’t like ball powder for cast in the Krag because it can do weird stuff….
4227 and 4198 work well in my son’s Krag.
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So far the H380 worked for me, at least for jacketed bullets. I like how it doesn’t stick to everything like flake powder does, although it is a bit bouncy.
I liked 4227 for cast bullets, but I’m out of those right now. I did, however, find this load data for 4227 and lightweight .32-20 bullets, which I can easily order online. I might give it a shot.
Attachment 326331