I have to admit I'm pretty curious about the .327 Magnum but have never shot one. I'm told the cartridge is quite obnoxious.
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Georgia Arms, Buffalo Bore, Underwood are three I can think of off hand.
I'd want a jhp that doesn't expand much or just a SWC style bullet. Underwood probably has a Lehigh defense alloy bullet load and that's probably what I'd use.
Or https://www.buffalobore.com/index.php?l=product_list&c=90
I didn't see an offering at Underwood either.
To me the Lehigh Defense and Penetrator pistol bullets are light, very fast (in certain calibers) wadcutters. They make a pistol lighter, have less recoil, and cut a deep hole. They arent blasty, are low or mild flash, and fired casings dont show over pressure signs.
Based on the testing (especially chrono) I've seen they are assembled with precision.
I've fired them and other Underwood loads in 10mm, .40, and .357 Auto. It's all been accurate, high quality ammo.
Black Hills also makes a load for 32 H&R Mag.
Underwood ammo is not a gimmick BTW.