madsenshooter wrote on Nov 28^th, 2017 at 1:25am:

The 311365s that Paul is talking about are cast of a very hard yet malleable, alloy.  Though he's shooting them slower, I've found they're easily good for 2000fps.  Honestly, I think I've had them up around 2300-2400fps using a case full of slow burning powder.  I didn't get a good idea of accuracy at that velocity level, my sights were set for 2000fps and the much faster ones hit over the target.  There was no alloy blowing back on the case neck, a sure indicator of too much pressure for the alloy.  I'll get back to experimenting with them one of these days.  First I need another batch of that alloy!  Rich, this is the copper enriched stuff that you read about on castboolits.  I sorta made the discovery, and badgered ran with it.

LOVE copper enriched,,,,,,,amazingly tough stuff.  Bob, it's been long enough that I've forgotten the powder you were testing.  7383?

Next week after our firearm deer season is over I had it in mind to re peruse the 10B101 data to see what would apply to 165 and 195 grain cast loadings in the 30-40.