Not sure which inertia gun you have. I have a Benelli Supersport. It does handle 7/8 oz. loads @ 1250 FPS plus. I shot those loads in a winter Skeet league with no issue, no matter how cold it was.

I have never tried 3/4 oz. loads in it, but I doubt that they would reliably cycle my shotgun. I dropped the 7/8 oz. loads to 1200 FPS and every now and then it would fail to cycle.

I have tried 3/4 oz. loads in my 16 gauge guns, it was kinda fun but I have no confidence that as the range gets longer, the 3/4 oz. loads break every target I point correctly.

I'll take your word for it. At present I'm just using my field gun (Franchi I-12) for whatever I shoot. It does fine with 1oz and 1 1/8oz loads even though the recommendation is for min of 1 1/8.

If I get serious about shooting in more matches - I haven't shot in any yet - I will probably look at something like a used Beretta Silver Pigeon or something along those lines. Once I got an o/u I'd have more reason to keep reloading as I could load 7/8oz or 3/4oz loads which aren't as easy to find.