I picked up a few odd cartridges at a club meeting that I had never seen before. Having trouble finding info. hope someone can help me out.

They appear to be factory loads as there were no signs of the cases being reloaded. One was 25-35 win. the other was .300 sav.

Rather than a bullet sitting atop both cases, there was a brass cup, think bullet jacket that was never swagged around a lead core, and the cup is filled with some sort of light weight organic (?) media sealed into the cup by some kind of bonding agent.

Any ideas?? Thanx

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