H4831 produced good groups ad adequate velocity from a 22" Douglas barrel on a Springfield as long as velocity was kept relatively low.
This rifle does not group well with ant bullet when maximum loads are used.
200 NP - 60.5 gn H4831 - 2519 fps - 1.1" group
200 AB - 60 gn - H4831 - 2483 fps - 1.1" group
200 AB - 61 gn - H4831 - 2610 fps - 2.5" group
A 20 3/8" bbl SAKO does very well with 200 NP
60 gn - N560 - 2603 fps - 210 primer
56 gn - StaBall 6.5 - 2624 fps - 215 primer
60 gn - R26 - 2615 fps - 215 primer
Calculating from published 270 data using The Rules (thanks JB) about 2600 fps is all one can reasonably expect from a 20" bbl without exceeding 65,000 psi.
Cheers,
Walt
