Okay, I got a chance to shoot 50 rounds of the 44 Mag loads today, 10 each of 5 loads using 2400 and the 300 grain Sierra flat-point. Winchester LP primers in "Top Brass", the chrony was ten feet ahead of the muzzle, velocities listed are actual, not corrected. 20" Barrel, Ballard-rifled. Results were as follows:
14.0/2400 Low 1136 High 1256 Average 1183 Standard Deviation 35
14.3/2400 Low 1177 High 1265 Average 1222 Standard Deviation 26
14.6/2400 Low 1201 High 1281 Average 1253 Standard Deviation 24
14.9/2400 Low 1287 High 1320 Average 1304 Standard Deviation 9.9
15.2/2400 Low 1279 High 1334 Average 1318 Standard Deviation 22
These loads are too long to feed through the action of my 1894SS, so they were single-loaded. I've seen data (both Alliant and GMDR) that showed maximum loads as high as 19.0 grains of 2400, this rifle has always shot better with milder loads and I only had 50 of these bullets so I started low and didn't push the loads to maximum. The brass was coming out a bit smoky until I got to the 14.9 load, and recoil was there but not bothersome. Primers went from rounded to a little flat, but nothing alarming and ejection was effortless. Could these loads be boosted? Absolutely. Is it necessary? Maybe to flatten trajectory or force better expansion, but penetration at 1300 feet a second should be
excellent, and these would make good black bear/elk loads if you were to modify the carrier to accept the longer rounds, these were about 1.720" or so. You could also seat the bullet deeper, but that skews the pressures rather badly, and I'd rather crimp into the cannelure in a gun with a tube mag or some recoil............or both.
I shot and chronographed at the same time, so the distance was limited to 25 yards. All loads grouped under 1.25 inches for ten shots, the 14.6 load shot under an inch, and the last two were both a shade over a half-inch.
Bill, I hope this helps a bit. I know you're thinking more about cast boolits, I'd recommend a gas-checked design if you're looking to push them, but my only luck with lead bullets so far was several years ago at some pretty sedate velocities. But 50-yard groups were an inch or less for five shots, so it wasn't a
complete waste of time.