with CFE 223's greater temperature stability.
Ha! I got a chuckle from that. Don't know where you read anything positive about CFE223 and temp stability, but it's cause to doubt that source. It's one of the most temp sensitive choices you could make, in my experience. TAC is a similar burn rate but much more stable, for example.
Trying to stick with one powder for multiple cartridges is a common new reloader mistake. You've already acknowledged you'll need more than one pound of powder to use all your primers anyway; you might as well choose one ideal powder for 223 and one for 30/30, without them needing to be the same. Burleyboy's suggestion above is good.
I think you might be a bit optimistic in 223 bullet weights as well, but some of these other guys spend more time with 1:12 twists. From the last one I had in that twist rate, I had much better results in the 50-55gr range or lighter.
Thanks for the advice on powders. It looks like I may look at several more powders before I decide what I want to start with. I have a lot to learn.
90+ temps can be expected here over a six month period, so a temp stable powder has become something I believe I'd like to use.
As far as the Sierra 63 SMP, they say it was designed with older slow twist rifles in mind and it has a short length for it's weight.
https://www.sierrabullets.com/product/22-caliber-63-gr-smp/I have read many here say they have had success on medium game. But Sierra doesn't specify it for this use.
The 64 grain Power Point is used in the ammo labeled for deer and hogs, so maybe it's a little tougher.
Here's a bullet length list I found. And length is often correlated with ability to stabilize with a certain twist rate.
https://www.jbmballistics.com/ballistics/lengths/lengths.shtmlThe Speer 70 grain Semi-Spitzer shows a length of 0.808".
https://www.midwayusa.com/product/1010619848This bullet has a similar design to the lighter 63 SMP and the 64 Power Point. The Sierra is 0.755.
53 grain TSX, 0.792.
Hornady 60 grain Spire Point, 0.750. 55 grain is 0.715.
Nosler 60 grain Partition Spitzer, 0.790.
Nosler 64 grain Partition Protected Point. 0.800.
And the Nosler 55 grain Ballistic Tip is 0.810 inches. Longer than any of the heavier bullets above. So I'm somewhat optimistic.
Edit:
Also found this calculator for stability on JBM. Says between 1.3 and 2.0 is the goal.
https://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi60 grain Hornady SP at 3100 fps in a 12 twist is in the green at 1.412.
63SMP at 3000 fps is green at 1.439
The 53 grain TSX at 3300 fps was below optimum at 1.091
70 grain Speer semi-point at 2750 was just below the green with a 1.280 score. So this would probably be ok at short range.
