Below is computer-generated (Load From A Disk I) data from J&D Components, Orem UT from whom I got my sabots and the seating tool.
.30-30 Win - 55-gr bullet - seating depth 0.25" - COL 2.5"
Powder Type - IMR-4198 / RX7 (Reloder 7) / S-4197 (Scot 4197)
Charge wt. gr. - Velocity fps - Pressure psi
30.2 - 3300 - 35500
32.2 - 3500 - 40300
34.3 - 3700 - 45700 - High pressure, reference only
36.3 - 3900 - 51200 - High pressure, reference only
38.3 - 4200 - 57000 - High pressure, reference only
40.3 - 4400 - 63100 - High pressure, reference only
"For starting loads reduce calculated powder charge by at least 10%."
I tried 55-gr JSP's and Reloder 7 charges of 27.0, 29.0, 30.0 and 31.0 grains with the 0.25" seating depth and a COL of 2.586" and got 3 to 3.5" groups at 50 yards from a 4X -scoped .30-30 Savage 340. Large amounts of unburned powder were left in the bore and at least two sabots failed to separate from the bullets.
I also tried some genuine Remington Accelerator sabot bullets with AA2700 charges of 29.0 to 33.0 grains in one-grain increments. Best groups were 4" at 100 yards with 32.0 and 33.0 grains from the same rifle. This is coyote/wild dog-level accuracy at best.
.308 Win - 55-gr bullet - seating depth 0.225" - COL 2.5"
Powder Type - IMR-4198 / RX7 (Reloder 7) / S-4197 (Scot 4197)
Charge wt. gr. - Velocity fps - Pressure psi
38.8 - 3600 - 34200
41.4 - 3800 - 38900
44.0 - 4000 - 43900
46.6 - 4300 - 49300 - High pressure, reference only
49.2 - 4500 - 54900 - High pressure, reference only
51.8 - 4800 - 60900 - High pressure, reference only
"For starting loads reduce calculated powder charge by at least 10%."
Thay have the Sabots, data for just about anything (at some point you start "infering" using 30-calibre cases with "same/similar case volume as cartrige X")
I do actually reccomend the insertion die for seating the bullets in the sabots and I reccomend the Lee Universal Flaring Die also, just makes insertion so much easier.
I have had good luck with Speer 52gr JHP varmit bullets as well as 50gr Hornady V-Max boattails. I THINK my best charge was about 42gr of Vhit. N-110, but would have to look to confirm (downstairs). 3980 fps according to Chrony.
I get well under 1MOA (about .6/.7) out of my .308 BAR but they will not cycle the action reliably.
Oh, BTW, any MORE powder in my load is not dangerous, it just throws bullets all over the place, like FEET off-line, they do not separate cleanly and keyhole at very high velocity, at least, out of my rifle. Probably over-powering the sabot untill it "skids".
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