I had a few 303 based cartridges, but took pity on the Ackley crowd.
I didn't want to embarrass them. Especially the 6mm/30-30 Ack Imp guys. Although that is a nice cartridge!
I like that the 6x45mm is low pressure, inexpensive to load, and has sufficient energy for my needs. It's not a shoulder thumper either. IOW, I used the proper tool for the proper job.
Plains or LD shooters might need large containers, but the under 300 yd crowd doesn't. Try to convince them of that though.