10mm 200XTP 13.0 AA#9 test

[The_Shadow]

10mm 200XTP 13.0 AA#9 CCI 350 COL 1.255" tested in the new Glock 20SF Stock barrel and RSA June 8 2013
Velocities  1179 fps / 1244 fps
Starline case 0.4330" / Winchester case 0.4340"
primers moderately flat, cases have smooth round expansion but "no smile lines"
I'll be sending two of them to Inercooler for testing also.

[gofastman]

I have always noticed really flat primers with AA9, even at moderate loads.

I like this stuff, its accurate, clean, and low flash.
Id hate to call it idiot proof in 10mm because idiots are so damn resourceful,
but its pretty hard to blow yourself up with this powder (again, in 10mm)

[sqlbullet]

Yeah...You can't really seat the bullet over much more than 13 grains of the stuff with a 200 grain pill.

Good powder.  Wish I could get the performance for a little less price.  Like finding 16 lbs of the old WC-820 that has an AA#9 burn rate.

[The_Shadow]

To actually keep the powder form pushing the bullets back out you need to watch you expander plug diameter or not let it go very deep into the case mouth.  This allows the bullet a tighter fit when seating and helps to maintain a firmer grip so it doesn't back out.  I also seat without a crimp being applied then crimp in a separate step to finish.  Yes it is that compressed.

This was a real problem with the Barnes 140 gr. TAC-XP, I could only get 12.6 grains of AA#9 inside with out movement.

[doverpack12]

I worked up a load using AA #9 over the weekend and at first with lower level loads my primers were being flattened and then as I increased powder charge they flattened less.

[sqlbullet]

Interesting.  I can think of a couple of reasons that may be, but couldn't begin to describe them in detail.

[doverpack12]

I was quite confused myself.  I just figured the primers would keep flattening with increased loads as I expected when reading about AA#9 but to my surprise they did not only with 1050fps- 1100 fps loads or approx. 11 grains to just under 12 grains.

[REDLINE]

Velocities  1179 fps / 1244 fps

I'm mildly surprised there was a 65 FPS difference between the two, as I generally haven't seen more than about a 30 FPS spread in my own No.9 workups in charge weights ranging from 12.5-14.0 grains.  But like I said;  Mildly Surprised.

[REDLINE]

Regarding No.9 load primer flattening;  for me so far I haven't studied my own workups super-super close, and always felt my various No.9 loads all flattened fairly close to the same.

With No.7 I've had worse flattening than with No.9, but it could just as well be because I was at some higher pressure level than the No.9 loads anyway.  Like I have a clue.

What I would give for some pressure testing equipment.

Guess it doesn't matter much at the moment, as I can't find 180gr or 200gr XTP bullets to save my life.  I'ld like some Gold Dots too, but I feel like that won't happen for like a millennium or so.

[REDLINE]

Yeah...You can't really seat the bullet over much more than 13 grains of the stuff with a 200 grain pill.

At 14.0 grains of No.9 I can't get a 200 XTP load below about 1.263", and that's with the top of the bullet lightly leveled on top ~.003" from seating and crimping in the same operation (at least my Glock mags can still handle that).  Like The_Shadow said;  I also seat without a crimp being applied then crimp in a separate step to finish.  I'm working toward that, have the proper dies, but no bullets, so I'm dead in the water for now anyway.

[doverpack12]

Velocities  1179 fps / 1244 fps

I'm mildly surprised there was a 65 FPS difference between the two, as I generally haven't seen more than about a 30 FPS spread in my own No.9 workups in charge weights ranging from 12.5-14.0 grains.  But like I said;  Mildly Surprised.

I don't have my notes with me I forgot them for the week.  I started at 11.0 grains and was at 1050 fps and worked up from there to 13 which resulted in an average almost exactly at 1200 fps.  My numbers could be off a little above I know for sure the starting and ending numbers are correct.

[RMM]

I just finished loading up some 200 gr XTPs over 13.0 gr AA#9 when I got online and saw this thread!  I am going to chronograph them tomorrow or Thursday out of both the Stock G20 barrel & the 6" KKM.  I will report back with the results.

Specs:
New Starline Cases
1.260" COAL
CCI-300 Primer
200 gr. XTP
13.0 gr AA#9

I seated these with my new flat seating plug (that my friend machined for me!) and there is no longer any deformation like I was experiencing with the rounded seating plug. 

[REDLINE]

I'll be curious to see your results with the NON magnum primer, and the velocity difference between the 4.6" and 6" barrel lengths.

[DM1906]

AA9 powder.  It's so uneventful with the 10mm.  I know a lot of folks use it, and think they get good results, and that's fine.  Fact is, you just can't get enough of the stuff in the case to really perform.  It's like trying to use H110/W296, it just ain't happening.  The powder is too slow, and not dense enough to get the pressure up (unless you are trying the "lite" versions, which are misleading).  It's a good powder, just not good for most 10mm.  Get it compressed to 120% (not easy, at all), and you might have something.

[RMM]

AA9 powder.  It's so uneventful with the 10mm.  I know a lot of folks use it, and think they get good results, and that's fine.  Fact is, you just can't get enough of the stuff in the case to really perform.  It's like trying to use H110/W296, it just ain't happening.  The powder is too slow, and not dense enough to get the pressure up (unless you are trying the "lite" versions, which are misleading).  It's a good powder, just not good for most 10mm.  Get it compressed to 120% (not easy, at all), and you might have something.

That's why it's good for someone like me... can't get enough in the case to blow myself up! 

I also loaded some 800x rounds ala Underwood... I have been working up to 10.2 gr under a 165 grain pill and 9.4 grains under a 180 gr HST.  Will chrono them today if possible. No smilies or crazy pressure signs yet working up .1 gr at a time from 9.4 & 8.8 grains respectively but I would be lying if I didn't say that I remove the magazine and wear a glove for the first few rounds of each increased charge.