I found a hen's tooth recently in a LGS. A new in the box Remington 673 that was lost in the back room for 15 years. The only kink was it's chambered in the one caliber I'm not set up to load for. .300 SAUM So I found some dies, picked up a little once fired brass and have a few boxes of Hornady 150gr and a couple of cans of Hornady Superformance powder. Has anyone used Superformance powder in their 300 SAUM? I have a few cans of other powders as well but since powder is becoming scarce I would love to use what I have.
Thanks

Can't help you out with the 300 saum, i have a 7mm saum, and with lighter bullets mine likes 4350. Pretty much the same case. I don't know about the superformance powder.

I’ve not used superformance, but the 300 SAUM I just did the load development on shot extremely well with 130 grain Barnes TTSX and the max load of ramshot big game in the Barnes book.

Thanks keep it coming. The long game is to load some 180s for moose. I'm hoping to play with a few different loads.

i have loaded 180 Noslers with Superformance 67 gr. if I remember correctly. I am not near my loading data so I will confirm in several days. I also used Nosler data for 150's several makes and varget. Noslers accuracy load was very good. R-16 and 17 are my current go to powders with 150 and 165 bullets.

I worked some loads for my Model Seven 300 SAUM (22" barrel) in March using some blem 150 gr. Nosler E-Tips and Superformance. I interpolated data from the 300 WSM, which has listed data w/ Superformance. Using REM brass & Fed215 primers, I went as high as 72.5 gr., reaching 3286 fps but had a little too much bolt stiff lift & primer flattening (the temp was ~75-80*F). I backed off 1.5 gr. to 71.0 gr. @ 3213 fps. My COAL was 2.800" (max for the magazine) which still gives me a 0.110" jump in this long leade chamber (factory). I shot this on a recent cooler day (upper 40's) and got 3156 fps from a cold barrel & ammo. Superformance seems to give the highest velocities with the midrange bullets weights compared to other powders for this cartridge, so I'm happy with it. And Hornady says that it is reasonably temperature stable. Not having any luck w/ the E-Tips accuracy wise though; 2-2.5+" three shot groups @ 100 yd. as good as it gets. I plan on switching to Barnes TTSX in the 130 & 150 gr. when I can find them! I haven't found this Model 7 (or another in 260Rem) to be capable of MOA accuracy; rather 1.5-2+" three shot groups @ 100 yd.
I've also used the Barnes 175 gr. LRX w/ 61.0 gr. of Reloader 17, Fed 215, COAL 2.80", reaching ~2964 fps. & ~1.75" 3 shot 100 yd. groups.
Hope this helps! -Mark & Belle

Personally, I have had best accuracy and velocity with powders in the 4350 burn rate range, even slightly faster. Presently using Reloder 16 and Accurate 2700 with 165/168 gr bullets. I would think Superformance would work fine but you may be leaving some velocity on the table with 150 gr bullets. Neither Hodgdon or Nosler reference Superformance in their 300 SAUM data (or Nosler's 30-06 AI data).

Thanks. Powder is hard to find around . Reloader17 which seems to the go to powder is non existent right now. I have some vintage 4064 I’m going to try. Like I said I have a couple of pounds of Superformance. Just working with what I have. I found a box of Speer 180 full curls. I’m thinking this maybe a good moose bullet.