VV N133 in a 223


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Okieloader
March 25, 2013, 02:02 PM
My first time out here fellas, be kind!

I've done my best to look for this, but with little luck. I am loading .223 rounds for an AR with 62 Gr projectiles. Every thing I can find points to a 21-25Gr load using N133.

Here's the rub, the load is horribly compressed, sometimes to the point of not being able to reach an in spec COL.

I am sure everything is per the numbers, but still no luck.

What am I doing wrong?

Thanks,
Wayne

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Col
March 25, 2013, 02:45 PM
looking through the Vit load chart shows no entry for 62 grn bullets using v133, running the load through quickload shows 24 grs to be almost max pressure and 110% case load, 25 grn load shows well over max pressure with 115%case load,, if it was me Id consider loaking elsewhere for data, do you have any manuals for instance,something is very wrong with your data

rcmodel
March 25, 2013, 02:55 PM
Hornady #6 shows N-133 with a 60 grain.
19.5 Start.
22.2 MAX.

Speer #13 shows it with a 62 grain.
21.0 Start.
23.0 MAX

You could get a couple hundred FSP more velocity with a different powder.

rc

Otto
March 25, 2013, 03:38 PM
N133 is an excellent powder in the 50gr-55gr range.
Despite what you may read on the Web, you souldn't exceed Vihtavouri's published load data. You can always send a email to Lapua and ask them.

Walkalong
March 25, 2013, 05:47 PM
24.0 Grs N133 and a Hornady 55 Gr Z-Max @ 2.225 Avg OAL and a Fed 205 primer gave me 2973 FPS from a 16" BCM upper.

I noted 24.0 Grs N133 under that Z-Max as 99% load density.

The ES was 87. N130 gave better numbers. I was working up to a velocity/max, and never accuracy tested either one.

I ended up using H322.

Okieloader
March 26, 2013, 01:19 PM
I guess I wasn't very clear on my issue.

The first load I tried was the 21grn and it is a compressed load.

I am sure all is accurate but I just don't understand why the bottom of the range would be compressed.

Any ideas?

Walkalong
March 26, 2013, 01:56 PM
I was clear on that.

My 24.0 Gr load was at an estimated (eyeballed) 99% load density. Sure about your scale and your powder weight?

What weight brass? Mine was 90 to 94 Grs thereabouts. Didn't weigh all of them.

I just don't understand why the bottom of the range would be compressed.

Any ideas?A very heavy case, or a mistake in charge weight.

Okieloader
March 26, 2013, 10:58 PM
Well, I finally figured it out.

I was using 62Gr M856 Tracer projectiles and these are a lot longer than standard 224 projectiles. I am not sure how they use them, but it does explain
why I am running out of room in the cartridge. The orange tip is the tracer round.

Thanks for listening guys.

Walkalong
March 27, 2013, 07:30 AM
I am not sure how they use themThey simply use a denser, and perhaps faster, powder. Either way, they use a powder where the appropriate charge takes up less space. Glad you figured it out.

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