Here's a comparision of shooting results with the Lyman Mustang with three different bullets and the same load.

The bullets were the 250 grain Speer Gold Dot HP, the 300 grain Hornady HP/XTP, and the 300 grain Sierra Jacketed Soft Point.

The load was 100 grains volume (77.8 grain weight) Triple 7 FFG over Harvester Crush Rib sabots with CCI 209 primers. All charges were weighed.

Each 5-shot string started with a cold, clean barrel. Barrel was swabbed after each shot with both sides of one patch dampened with Butch's Black Powder Bore Shine, followed by both sides of one dry patch. The second side of the dry patch came out almost clean.

In each string, shots were fired as soon as the gun could be loaded without extra delay. By the fifth shot the barrel was pretty warm.

All shots at 50 yards from a solid bench.

Here's the Hornady target.