Hmmm. I've got a Sako Vixen in 222, my load is H4198 and 40 Vmax. What's the advantage to reducing velocity with Blue Dot vs a typical rifle powder, just a lot less powder consumed?
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Start at 10g of Blue dot with the 40g. First, thing is weigh every charge, the big flake powder is prone to bridge in a powder measure. Accuracy will be great as you work your way up.
Advantage is less powder, which means it is very difficult to ever shoot out a barrel, less fouling, and somewhat quieter.
Very effective reduced velocity load. Accuracy load with Blue dot will be 2600-3000 with the 40's.
I have had a flock of 22 Hornets, and one custom K hornet. 221 Fire Ball, 222, 223 would have saved me a LOT of money chasing accuracy in the 22 Hornet with Hornet velocity easily attained with Blue Dot powder with better accuracy.
The most accurate Hornet I ever had was a Ruger #3, Win 296 with a 50g Nosler ballistic tip. My favorite was a Ruger with a Pac Nor barrel chambered in 22 K Hornet. This rifle ended up being a major coyote thumper with 40g Speer spire points where I could touch the lands at Magazine length.
22 Hornet brass is all but impossible to find, look before you leap. If you are starting from scratch and want a light, handy rifle, consider the CZ 223, and load Blue Dot to Hornet velocities. I worked up a load with Blue dot in the 223 sporter where the 55g sierra was only doing 2500 at the muzzle with Blue Dot, and shot 3/8" at 100 yards, my bob cat and fox load.
If I were to go down the Hornet road again, it would be a 20 Ackley Hornet, hands down, twisted for 40g bullets for use on coyotes. I had a number of 17 Ackley Hornets, not a bad one in the bunch.
My love affair with 22 Hornets was on par to a Love Affair with a very Irrational, Bi Polar Red headed/Blue Eyed girl friend, that simply could not be "fixed".