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Old November 26, 2012, 05:40 PM   #34
JerryM
Senior Member
 
Join Date: April 4, 1999
Location: New Mexico
Posts: 1,884
My favorite powder is IMR 4350 behind a 100 gr bullet. Velocities are slightly over 3100 fps from a 22 inch M70 FWT pre 64.
Factory loads often run about 2900 fps which takes it down in effectiveness a lot.
My loads exceed handbook loads by 2-3 grains so I won't post them. However, when the .243 WCF first came out the writers used 45 gr of 4350.

I have not found any pressure problems. I have worked up loads with 4350 in my rifle that exceeded 3200 fps with 100 gr bullets. I know pressures are high, but do not get hard bolt lift or problems with primers showing too high.
My rifle is a "fast" rifle, and I have never found another that can reach such velocities. I had a friend who had a Sako, and he had difficulty getting over 3000 fps from his rifle.

In my view any powder faster than 4350 can not get the velocities I want in a .243.

I tried H 4831, but the case would not hold enough. Norma 204 is the same burning rate as 4350, and is more dense.
I have not used any of the newest powders, but if you stay with a burning rate of 4350 or slightly slower, if the case will hold it, performance will be fine.

Jerry
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