.308 Winchester brass/55gr 22 caliber bullet.
IMR-4198
75% loads- 38.8gr 3600fps 34,200 psi.
80% " 41.4gr 3800fps 38,900 psi.
85% " 44.0gr 4000fps 43,900 psi.
90% '' 46.6gr 4300fps 49,300 psi.
(not listing data for 95 & 100%)
100% exceeds 4800fps
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300 WinMag brass/55gr 22 caliber bullet
IMR-3031
75% loads- 61.3gr 3800fps 31,900psi.
80% " 65.4gr 4100fps 36,300psi
85% " 69.5gr 4300fps 41,000psi.
90% " 73.6gr 4600fps 45,900psi.
100% exceeds 5100fps
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I got this data along with some sabots I ordered from the E. Arthur Brown Company. I also have data for 300 H&H Mag, 300 Weath Mag, 308 Norma mag, 30-40 Krag, 300 Savage, 30-06, 30 Carbine, 30 Herrett, and 30-30 Win.
So far I've loaded sabots for the K-31 in 7.5x55 and 7.62x25 Tokarev(handgun)and have had great results, they're tack drivers.