Hoot-
In writing my post above, i checked availability of the Hornady 300-grain SST ML bullet sold without sabots (Hornady #45207) on Midway's site, and came up with this page:
Hornady Muzzleloading Bullets 50 Caliber Sabot with 45 Caliber 300 Grain SST Box of 20. I saw they were discontinued, and so I listed the bullet as #67263 with sabots, which I have sitting on my bullet shelf after being de-saboted.
Your link to the Midway page listing the #45207 shows the bullets as being available:
Hornady SST-ML Muzzleloading Bullets (No Sabot) 45 Caliber (.452 Diameter) 300 Grain Box of 50 .
I suspect that Hornady did not discontinue making the bullets, but just discontinued packaging them in boxes of 20 bullets priced at $27.99, and started distributing them in boxes of 50 priced at $31.99. That's pretty good: 30 more bullets for just $4.00 more. And they are
available.
(On the Midway page showing the discontinued boxes of 20, the "Product Information" is really muddled, describing swaged round balls. Apparently a rough draft page made it onto the Midway web site. Ooopsie!)
Way back in 2009 Siringo noted that the pointy SST 300-grain bullet did not fly as flat as the 300-grain XTP, despite having a better ballistic coefficient according to Hornady (.200 vs. .250) Very strange. I've got both bullets loaded for some initial trials with 300-MP when the U.P. defrosts in the spring.
Thanks.
--Bob