I have shot a lot of cast 9mm bullets, but not in a P320.

I don't see why they would not work for you. The bullet that you specified is a flat point and rather long. It may have more potential for feeding issues than their 125 gn round nose. Not saying it won't work, it may be fine. I have shot semi-wadcutters with good luck.

Also these bullet are made from range lead which means that they are rather soft. Not likely to be a problem at 9mm velocities, but you need to understand what you are getting.

 

I have shot a lot of lead bullets through all my Sigs, the P22X classics, and the P 320s, all in 9mm/40S&W/45ACP. They all worked fine, but I would suggest you try the powder coated bullets also, even if a bit more expensive. I find it much easier to clean the gun after using the PC bullets, and they give much less smoke and lead in the air when firing. When I run out of jacketed bullets for all three calibers, I will be switching to PC bullets exclusively- no sense wasting money on jacketed bullets when they are not needed.

 

I totally agree, Hi-Tek polymer coated bullets are the only way to go. They are much less expensive than jacketed and waaaay cleaner than external lubed. The only negative I have heard about them is they may smoke slight more than jacketed in low light shooting with lights. Other wise they have less friction than jacketed, the barrels are easer to clean, and there is much less residue on the rest of the gun. I have shot them in my G45 Glock, 1911s, P320 XCompact, P210, P229 Legion and other pistols without any problems. My fav is the 124/125g LRN and I have shot thousands of them.