ORIGINAL: little indian
Stay away from the 1.75 oz. 3" & the 1.75 oz 3.5". The 2 oz & 2.25 oz loads are the best. Don't waste your money.
I've got 207 reasons that fit into a 10" circle at 40 yards that says the 3.5" 1 3/4oz Hevi-13s ain't quite as big a waste of money as you may think....
Every gun shoots different loads a bit differently... and while I haven't put any of the 2.25oz loads through her yet, I'd be the first to vouch for the 1 3/4ozs as a heck of a great load through my gun.
Keep in mind too that there are about 375 pellets of #6 in that 1 3/4oz load... do the % math and I'll bet you'll find that % wise its pretty tough to beat.
Although, like you illuded too... I have heard things about the new gold/bronze shell hevi-13s... the ones I'm shooting are green hulled. I've been most pleased with them.