Thread: Working on a 5.56 H335 load,

Getting good results out of 24gn of H335 with 55gn hornaday fmjbt’s out of my 20” AR however I’m wondering if I should change my seating depth, currently seating at 2.20, I’ve got the 5.56 chamber and I’m wondering if the jump to the lands is hurting me.


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Originally Posted by MCol

Getting good results out of 24gn of H335 with 55gn hornaday fmjbt’s out of my 20” AR however I’m wondering if I should change my seating depth, currently seating at 2.20, I’ve got the 5.56 chamber and I’m wondering if the jump to the lands is hurting me.


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It could be. My pet load for my AR with a 5.56 Nato barrel that is 16" with a 1:9 twist is 24.6gns of H335 at a OAL of 2.250. I tried seating depths from 2.200 up to 2.260. 2.250 gave me the best results.

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Originally Posted by CodySPowell

It could be. My pet load for my AR with a 5.56 Nato barrel that is 16" with a 1:9 twist is 24.6gns of H335 at a OAL of 2.250. I tried seating depths from 2.200 up to 2.260. 2.250 gave me the best results.

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I agree with Cody. Try to run them at 2.250. I get great results at that length as well.

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I’ll give that a shot, thanks!


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Originally Posted by MCol

I’ll give that a shot, thanks!


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Of course! Let us know how it works out.

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Originally Posted by MCol

Getting good results out of 24gn of H335 with 55gn hornaday fmjbt’s out of my 20” AR however I’m wondering if I should change my seating depth, currently seating at 2.20, I’ve got the 5.56 chamber and I’m wondering if the jump to the lands is hurting me.


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I use H-335 with the 55 gr fmjbt. Get great accuracy once you fing the right load.