Me too. My first .30 mould was the Ideal 311291. That shot very very well from my first 03A3 at 100 yards. I got the 311284 because I wanted something with the legs to go out to 200 dependably, and also work the action of the "new" M1 trhat I had just gotten. With WW II surplus 4831, that old mould handled both jobs admirably. It grouped so well out to 300 yards from the 03A3 that I used that load pretty much exclusivly with that rifle for 200 and 300 yards, switching to 168 grain Sierra Internationals only for the 600 yard stage of the National Match Course. From the M1, it grouped about as well as a "good lot" of ball ammunition, or about 2-1/2 MOA. I never shot that load from the M1 in a match, but it was good for short range rapid fire practice, as it worked the action very reliably. I had one observer tell me that it looked like the action was moving in slow motion, but it always worked.
Respectfully,
Bob S.