Subsonic loads for 222 Rem/ 223 Remington

I have perfected casting NOE 37 grain Plain Base bullets.
I powder coat these bullets and I want to use them in subsonic loads in 22 Hornet, 222, and 223 Remington.
It seems that accuracy falls off at about 1400 fps. In the 22 hornet using a load of Dupont Bulk powder (Obsolete, powder is likely 70 years old) I get 1020 fps and incredible accuracy.
Any one have any starting points for the 37 grain NOE PB bullet in 222 or 223?

I am looking to duplicate subsonic 22 long rifle velocities.
Pointers to reloading manuals with subsonic loads would be appreciated.

I am looking to duplicate subsonic 22 long rifle velocities.

Start off with your 22 Hornet load.

If you have Bullseye then try 2 gr +/-

Here is a subsonic for you for your 22 cf s:
Prime the case, and hand seat 22 cal pellets in mouth of case.
Very Subsonic plinking at short range
Accurate in my 222 Marlin Sako.
beltfed/arnie

I have used 1.5 grains of 700x in a 223 with a 55 grain PC'ed Bator in a handi. It does not appear to be position sensitive. It just penetrates a 2x4 and stops on the other side. 700X is just a step slower than BE.

Would Trail Boss not fit this application?

Quote:

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Originally Posted by farmerjim

I have used 1.5 grains of 700x in a 223 with a 55 grain PC'ed Bator in a handi. It does not appear to be position sensitive. It just penetrates a 2x4 and stops on the other side. 700X is just a step slower than BE.

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Thank you, exactly what I am looking for

Quote:

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Originally Posted by Larry Gibson

I am looking to duplicate subsonic 22 long rifle velocities.

Start off with your 22 Hornet load.

If you have Bullseye then try 2 gr +/-

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Thank you! I have a can of Bullesye, I will do that