Sierra Game King 1365 55 grain sbt 223 Rem

[thatmikeguy]

I'm looking for data on this bullet with H335, and H322 if available. I found some data but for different bullets. Max charge for a speer 55 grain is 25.3 grains of H335 and max charge for the Sierra 55 grain spt #1360 is 27 grains of H335. That's a big difference for 55 grain bullets.

 

[thatmikeguy]

I found the info online.

 

[hmr-hound]

right around 24-25gr of h335. I shoot 24.5gr with these game kings and the blitz kings and use cci magnum small rifle primers.

 

[thatmikeguy]

right around 24-25gr of h335. I shoot 24.5gr with these game kings and the blitz kings and use cci magnum small rifle primers.

That load seems to be popular.
I found a picture of the Sierra manual in another forum.
Their max load of H335 is 27.5 grains.

 

[thatmikeguy]

It looks like Sierras published max is too much. I started at 25.1, working my way up by .3 grain increments and made it to 26.0 and didn't go any further.
I will have to try sub 25 grain loads. At 25.1 grains H335 I'm getting 3200 fps. 26 grains h335 gave 3360fps.

 

[thatmikeguy]

right around 24-25gr of h335. I shoot 24.5gr with these game kings and the blitz kings and use cci magnum small rifle primers.

I went back to the range with some fresh loads. You were right. My best groups were with 24.4 and 24.6 grains H335.