I did not post it, but I know Walt Berger personally. He sat a whole bunch of world records with a 222 suing H335.
You will get the best accuracy with a thick cup primer such as a Rem 7 1/2, CCI BR-4, or the CCI magnum 450, keep going up in powder charge, you will see the vertical in your group disappear.
I buy my H335 in 8 lb kegs, there can be a very slight variation in lot to lot variations that can vary powder charge .3g.
Don't be surprised if your accuracy load is in the 3700+f ps area.
Fed brass is very soft and will not take pressures.
Lapua brass is some really tough brass and you can really get some good velocity with extreme accuracy. If you live in a hot area, it never pays to shoot the ragged extreme on hot loads or to let a round sit in a HOT barrel.
I shot the 40g Speer Sp on yotes at velocities that I won't mention in a 222...you will find out for yourself.
I like to determine what is a max load for my rifle and that particular lot# of powder with a particular primer.
I load one round and one round only, increasing powder charge .5g at a time, I want to know what my max load is. When I start seeing pressure signs, I call it max, back off 2.0g and start shooting 3 shot groups, .3g apart till I am within .5g of the max load, watching carefully at the minus .5g load. I stop any time that I see pressure.
On another note, I am selling off a good friends estate for the family. There is 483 count of the 40g blitz king Moly that I am selling for them for $70 +$5 postage, please don't feel obligated to purchase because they will sell, I'm not even worried. If you don't like the moly, just run the bullets through the tumbler.
I would love to hear of your further experiments with the H335.
The military uses a slower version of H335 in the 5.56 rounds, really unreal barrel life compared to H322 which gummed up the M16's in the Viet Nam War.
I got 10,000 rounds out of a 6 PPC shooting 60g Bullets with H335. At 10,000 rounds, the barrel would still group in the High .200's and low 300's.
Those thick cup primers will allow you to reach the top end accuracy node with the 40's, you are not going to believe it when you find it!
Good luck and stay in touch!
Keith