Magnum primers

[GH1]

 I'm going to load some pretty stout loads for 45 Colt using 16 gr AA#9. According to the folks at Accurate I can use between 16 & 18.8 gr and still be under 30,000 psi, which I guess is about as strong as one can go.
My question is, if I load 16 gr with magnum primers will I be OK?
GH1

[Siskiyou]

Brand of pistol?  Generation?  Bullet weight?

[GH1]

Hmmm, I guess I should've included that in my original post.
Anyway, it's Ruger Blackhawk Bisley bought new last year. The bullets are 300 gr cast.
GH1  

[Lloyd Smale]

yes if your shooting a large frame ruger. Yes you are going to want to use a mag primer with those loads. AA9 wont create enough pressure to burn real well with a standard primer till you get to at least 18 grains with a 300 in a 45 colt. My go to load for large framed rugers with 300s and aa9 is 19-20 grains with a cci 350.

[GH1]

Thanks guys,
GH1

[Catfish]

Start low and work up. Different primer and powder combo`s have different presure curves and there is about no way to know what will happen to a load if you change primers.

[Larry L]

Before loading those I'd verify the data as Accurate doesn't show anything that hot on their website even for Ruger and TC loads only. For a 300 lead cast bullet and AA9 they show a range of 13.5grs to a max of 15.0 grs....and that's expressly for the Ruger and TC pistols. Copper bullets, that data would be good, but not for lead or jacketed bullets.
http://www.accuratepowder.com/wp-content/uploads/2011/01/accurate_load_data_3.5.pdf

[anachronism]

They also show using only std primers with #9.

[Lloyd Smale]

Ive shot proably 10 kegs of aa9 through the years and have done alot of chornographing of it and it ALLWAYS works best with a mag primer. ESPECIALLY with reduced loads like the original poster is using. Im sure the reason they recomend standard primers is there loads might be closer to real world max loads then the other manuals and they dont want the added pressure of a mag primer. Standard deviation and accuracy have allways been best with mag primers and ill go as far as to say its allways worked best with cci350s which are the hottest mag primer.

They also show using only std primers with #9.