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On the low end of the spectrum there's the Foster pattern lead slug and the Brenneke pattern lead slug, many prefer the Brenneke slug. Suggest you research Foster and Benneke slugs. (Brenneke still regarded as a genius a century later) There are other alternatives for instances where a slug may be called for, this youtuber posts about all sorts of 12 ga. slugs https://www.youtube.com/@taofledermaus/videos So you have options. Personally I'm not a big fan of the 1 oz. lead slugs in either the Foster or Brenneke pattern. For one thing I don't like having to clean a leaded up barrel from shooting lead slugs, and the other is I can get better and more versatile results from a variety of DDupleks steel slugs. DDupleks rounds are much more expensive than lead slugs. The DDupleks Monolit rounds are apparently unavailable in the USA at this time. I stocked up on DDupleks slugs years ago when DDupleks slugs were much cheaper. https://www.ddupleks.com/products DDupleks introduced a frangible slug they call the Kaviar since I loaded up on DDupleks slugs years ago. Kinda like a Glazer safety slug, it has much lower muzzle velocity and energy, making it safer overall when innocent bystanders are in the immediate environment. And just like a Glaser slug there are limited instances where you'd use it, just another tool in your toolbox. YMMV

I'm guessing your trainers meant high brass and not high base, probably because they want to train you using shot shells that aren't wimpy so you get to feel the full effect of a higher powered round. You want to avoid 'low recoil' rounds for this reason when taking a shotgun training course. An easy way to judge how much recoil one can expect is to check out the feet per second (FPS) of a particular round you're considering. 1,500 FPS in the Federal Prairie Storm ammo is on the higher end and definitely not low recoil. IMO 'low recoil' shotgun rounds are anything below 1,300 FPS. The Federal Prairie Rounds you're considering would be perfectly suitable for your training course purposes as you're definitely going to get the full effect. If a manufacturer doesn't state the FPS spec then they should indicate 'dram equivalent', and here's an article with a chart for that - https://www.ammoforsale.com/ammo-club/what-is-dram-12-gauge-equivalent-chart/ Buy in bulk and $ave - https://ammoseek.com/