Pete, while you can use the same bushing, grain for grain, the 572 has greater deviation than Longshot. The 572 bottle says "Clean Burning", but that was not my experience.
I tried 100 rounds of 28ga using 572, and I too found the volume an issue. Fortunately I have a good variety of wads. I think I ended up using the BP2895, but that wad is too expensive. My normal, RO-28 Fiocchi wad and 20/28 gives me my best 3/4oz crimp (I'm loading only 2 1/2")
I went to Cabelas for shot today, and they did have plenty of Longshot and 572 on the shelf.
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