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 Loads for 65 Grain SGK in .223 Rem (AR15)
WildGoose  [Member]
10/14/2009 3:37:54 AM EDT
None of my manuals have loads listed for the 65gr SGK. Wondering if anyone who has a Serria book could list the Starting & Max loads with RL-15 and/or Varget with this bullet. I just need to know what range would be safe. Dont want to buy a Serria manual for just one load.
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longrange308  [Member]
10/14/2009 6:08:02 AM EDT
When i first started using the 65 sgk i had no data so i called sierra and the tech told me to use 63 grain data in there book , they work very nice on coyotes and deer
rg1  [Member]
10/14/2009 8:58:27 AM EDT
You familiar with how manuals list different bullets on the same page with the same data for each. Well anyway Sierra 5th Edition manual , the latest, lists data for the 63 gr. SMP bullet #1370 and the Sierra 65 SBT #1395 bullet on the same page with the exact same data used for both. This data is in the AR-15 section for .223 Rem. Here's a link to a page that has the exact data listed but this page only shows the SMP 63 grain bullet but it's the same data as in my manual for both the 63 and 65 grain bullets. They don't test Varget or Reloder 15 though.
For bolt action data for the 63 SMP bullet they tested Varget from 22.8 at 2600fps to 26.3 at 3100 but that's in a 24" barrel bolt action rifle. Maximum data in the manual is less for the AR-15 so I wouldn't go as high as the maximum listed for a bolt action.
Since this doesn't really answer your question and the 5th Edition manual doesn't test your two powder choices, I'd call Sierra's free Tech Support at 1-800-223-8799 and I'd bet they can help you with those powders.
CCW  [Team Member]
10/14/2009 9:22:57 AM EDT
Is the SGK that you are holding in your hand a flat base or a boat tail?
rg1  [Member]
10/14/2009 9:29:42 AM EDT
The Sierra 65 gr SBT #1395 Sierra Game-King is a boat-tail design
WildGoose  [Member]
10/14/2009 6:38:09 PM EDT
Thanks for all of the input and load data guys. I have load data for the 63 grain bullets in both the Lyman and Hornady manuals. Given what you have provided here I will just go with the same suggested loads in these books using RL-15 and Varget with the 65 gr. SGK SPBT's. All though I will approch the max levels with real caution. One of the most interesting loads I ran across in the Lyman manual was a load for the 63 grain SP Serria GK bullet using IMR-4198. Sure seems to be a poor match to me in the .223 for a slug that heavy. Any way thanks again for the effort and interesting comments.
Army03CRNA  [Member]
10/15/2009 4:50:21 PM EDT
I'm using 24.0 grains of Varget under the Sierra 65 SBT. The primers are CCI-400s. I'm using first reload FC cases from the 90s. The cases have been trimmed and the primer pockets uniformed with sinclar uniforming tool. The rifle is a parts gun, but the barrel is a new 20" Shilen 1:8 twist with a Wylde chamber and matching bolt (one of the reasons I bought this barrel was it was the easiest way––at the time––to get a bolt). I have also tried 24.0 grains of W748 but it's not as accurate. No chronograph data yet : ( Any more powder––either type––is too much for this barrel (and also too much for my like chambered RRA 16" bbl).

Hope this helps.
ttech  [Team Member]
10/20/2009 9:58:36 AM EDT
I use the suggested hunting load by Sierra for this bullet, whick is 25.5 grains of TAC. Very accurate in my gun (16in. Noveske N4 carbine) and Chono's at 2835 FPS. Very good Coyote bullet, puts 'em down with authority.
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