I had the pleasure to meet Brad from CRT last summer, and a very nice fellow he is. Somewhere in our visit the idea of this cartridge came up, I never gave it much thought after he left. So to my surprise months later he contacted me wanting to know if I could possibly help out. So with a few phone calls and some discussing and cussing we figured out a way to chamber a rifle with what tooling I had. I wont go into all the particulars of how it was chambered but I used a 204 Savage barrel that I had and put it on a Savage Model 10 that I just happen to have laying around being lazy. A whole lot of this cartridge was centered around the new Nosler brass that just came out not to long ago. So Brad sent out a few rounds, and in between Elk hunting trips I went to work (Still haven't found a damn Elk though). The parent case for this cartridge is the 221 Remington Fire Ball, of course necked to 20 caliber, Brad has ordered the reamer with the minimum body taper and a 40 degree shoulder. Yes I know it sounds like a 20 Vartarg improved and it is, at first I didn't think that it would make that much of a difference but I let you decide after you see what I found. For some reason I was thinking IMR4198 probably because that's what I shot in my Vartarg, and it worked ok although with a case almost plumb full it still wasn't showing any pressure. Brad suggested Accurate 2200, I just happen to have a pound collecting dust. What I found is that the SCC case only holds about a 1/2 grain more than the Vartarg, no big deal then. All along we where only concerned with 30 to 35 grain bullets, so I settled on the 32 Vmax for my first tests. Again these are just the first test loads I didn't feel that it was a fair comparison to try and shoot for accuracy with the barrel I had so everything was shot just for velocity for the time being. Always start 10% below starting loads, approach max loads with caution!!
Test #1 IMR4198 32gr Vmax CCI400 primers and Nosler 221FB cases .230 neck bushing.
17.0g IMR4198 3631 fps No pressure at all
18.0g IMR4198 3800 fps No pressure
18.5g IMR4198 3888 fps Case full half way up the neck, still no pressure
Test #2 Accurate 2200 everything else the same
20.0g A2200 3763 fps No pressure
21.0g A2200 3981 fps Still nice round primer no case expansion
22.0g A2200 4154 fps Showing pressure signs probably the max
You be the judge weather it gains anything over the standard Vartarg.
The left cartridge is a standard Vartarg, the right case is the new SCC cartridge