357 Mag, 140 grn JHC, 2400 and Seirra's #5 load?

[Peter M. Eick]

The title says it all.

Any ideas on why Seirra #5 is suggesting 17.4 grns max and 15.5 grns minimum for cci-550's and their 140 grn JHC load with 2400 (col of 1.585)? This seems awful hot for this combination.

With the same basic combination:
Hornady #1, 11.9 to 15.5 (max)
Nosler #4, 150 grn (close but heavier) 14.2 to 15.2 (max)
Speer #13, 13.1 to 15.1 (max) (non-mag primer)

Needless to say I am a devout cross checker of load data. Since Speer is using a non-mag primer I will let them off the hook, but the rest are a lot lighter then seirra. The closest Alliant load is a 158 grn JHP at 15.2 grns.

SOOOOO, even though I am using a seirra 140 grn JHC, I think I will start out at the 14 grn level and work up cautiously since this is below the Seirra minimum load.

By the way, anyone else faced this quandry? It seems to me Seirra #5 is pretty mild for a lot of loads.

 

[JackM]

Sierra #4's max is 14.6 grains of 2400 with CCI-550. I picked up half a box of the 140s at a gun show and tried them with Winchester WSPM primers, which probably was a mistake. 15.0 grains was enough and 15.5 was too much.

Bye
Jack

 

[MrPhil]

Speer #11 shows . . .

. . . 15.5 to 17.5 grains of 2400 and uses a CCI magnum primer! I haven't loaded that but did use their data for a 125 grain bullet. Quite a flame thrower. Backed it off a bit.

 

[HSMITH]

CALL Sierra........

 

[Johnny Guest]

As HSMITH says - - -

"CALL Sierra ........."

Customer service line is 800-223-8799.

Friendly, knowledgeable, helpful people. I've called 'em several times.

Best,
Johnny

 

[Peter M. Eick]

I am just about to give them a shout now that it is monday and I am done with work.


The answer is no it is not a typeo or anything that is their recommended load. I believe it was Glenn who commented that they appreciated me starting low and working up and asking about it when it did not make sense.

There you have it. (I still think I will start a lot lower and work up in more steps. Paranoid is it is)