I had been reading a lot of your posts about this bullet...

Projectile: 300 grain .452 diameter Speer Deep Curl
Sabot: EZ load Harvester black .452 sabots
Powder : Pyrodex RS 100 grains & 110 grains
Rifle: Renegade stock.. GMB .50 caliber 1-28 twist Stainless Steel 28 in
Ignition: percussion cap CCI #11 Magnum
Sight: Traditions 1.5-6x40mm illuminated scope Traditions mounts
Distance: 50 yards bench rest
Weather: 46º windy, over cast (felt great)

I used this rifle because it is sighted in for 100 yards. I normally shoot 300 grain Hornady XTP .430 diameter in green crushed rib sabots. So I wanted to see how it would compare to the Speer vs Hornady

I started with 100 grains of Pyrodex RS. I was swabbing between shots with isopropyl alcohol all but the last shot. I ran out of alcohol and used spit. I also had a slight hang fire because of it.

Loading the powder, I leveled the load with my shoe and then found out that even though they were EZ load sabots, there was nothing EZ about it. They loaded kind of stiff. Not hard, but stiff. I figured this might be a good combination. I fired the three shot group ( as noted) and then tried to adjust one and slip it in the bull. That is hard to do.

I then swabbed the rifle clean. It took four patches. I shot the three shot group with 110 grains of Pyrodex RS and was real pleased with that. I then discovered I was out of alcohol so I used spit as a swab material. The shot I tried to adjust for was a tick.. boom but I think I held well on it.

Over all that bullet seems to shoot real well. I purchased two boxes of them so I want to try them in other rifles. I think they will make a good hunting bullet.