Reloading 10mm

200 grain

AA#9

200gr. You'll need a slower powder - Longshot or #9

I like the 200g for the woods load. AA9 and 800x do very well for me.

Underwood ammo makes some good full power stuff as well if you ever need to buy anything loaded. Usually sell a bit of hot hard cast as well that might be worth a look for woods duty.

The powders you list are a bit fast for the 10 mm, unless you are making plinkers.

Pay close attention to seating depth. Do not go too short as pressures go up fast. I generally load mine as long as possible for my g20. Watch for bullet setback too.

wiiawiwb said:

3) Is there anything unusual I should watch out for?

Click to expand...

Yes, uncontrollable facial distortions (big SE grin) caused by 200gr full house loads


Edit: I'm a big fan of#7 as well.

800-X . Its a pain to measure but its a kick in the pants . Power Pistol too. Both great in the 10MM.

I have used both AA9 and 800X; both work well. You might find the 10mm forum, lots of info (and 10mm fanboys) there. Have a good clean place to shoot: brass goes into the next area code...

I'll put a vote in for full tilt Nosler 135 gr loads. Much more amusing than the heavies IMO for slaying pumpkins and water bottles.

I would try PowerPistol or Longshot before 800X simply because of metering. PowerPistol being the better metering of the two.

Watch for inferior brass. Sticking to Starline is a safe bet.

The Glock chamber is still sloppy despite being tightened up over the years. An aftermarket barrel is still beneficial.

I will say 180 Grain Coated TCFPs with the slightly faster burning AA#7. This should provide great accuracy and excellent terminal performance.

This load should also penetrate and exit anything in the Lower 48, so unless you are hiking on Kodiak Island you should be fine .

Just my .02,
LeonCarr

My Glock 21 with 10mm barrel loves AA-7

Vast amounts of 10mm data here...

http://www.thehighroad.org/showthread.php?t=795833

No one voting for Blue Dot? Kinda a classic powder for the 10. With 9.2 grains under a 200 grain Nosler JHP I'm getting about 1140 fps with good accuracy out of a 6" barrel. Those oughta leave a mark.

Max from Nosler's website is 9.3 grains. Speer and Lyman manuals have higher loads for other 200 grain jacketed bullets, if you feel lucky.

Weirdly, Lyman has #9 for jacketed bullets up to 175 grains, usually with the best velocity of any powder. Above that, they use #7 but not #9. Not what I'd have expected.

Gotta agree with Buck13 on Blue Dot for the 10mm. 800x would tie for 2nd with hs-6. I find the 180g bullet to be the most versitile.

My opinion is that 180s & HS-6 is probably not the best mix if you're after bigger numbers - I've only loaded up to 175s, and run into smiles (AF LW) and flattened primers faster with HS-6 than usual suspects.

Longshot, #7 on the other hand...

I'm liking BE86 in 10mm.

I'm a Lonshot fan with hotter loads.

Those coated bullets - do they have a FPS rating? (I'm curious v. copper plated)

Thanks and enjoy!

OilyPablo said:

Those coated bullets - do they have a FPS rating? (I'm curious v. copper plated)

Click to expand...

I cast (for 10mm usually BHN of 11-12) & coat w/ RAL, so I can only speak to those.

I've run 147s up to 1,500, and 176s to 1,350 without any issues.

Buck13 said:

No one voting for Blue Dot? Kinda a classic powder for the 10. With 9.2 grains under a 200 grain Nosler JHP I'm getting about 1140 fps with good accuracy out of a 6" barrel. Those oughta leave a mark.

Max from Nosler's website is 9.3 grains. Speer and Lyman manuals have higher loads for other 200 grain jacketed bullets, if you feel lucky.

Weirdly, Lyman has #9 for jacketed bullets up to 175 grains, usually with the best velocity of any powder. Above that, they use #7 but not #9. Not what I'd have expected.

Click to expand...

Blue Dot is 'peaky' and has mucho muzzle flash. I much prefer AA9. I have a ton of 800X but I don't want to bother weighing charges. #9 meters beautifully while 800X is literally the worst metering powder on the market.

800X has it's one major drawback. But it is the best performer for me. Longshot is a close second. I don't use AA powders but the performance is there. I've bought one pound of Blue Dot in my life. Way to much muzzle flash and it's known to do some strange things w/ light for caliber bullets. I think I still have most of the bottle left because of the flash alone.

I've loaded a fair bit of 10mm using AA#9, AA#7, HS-6, and Silhouette. (And also Unique, which I don't especially recommend). I would use them in that order as I moved down the power and weight charts. All 4 of those powders meter well for me.

AA#9 is a pretty forgiving powder. Good case fill (no possible way to double-charge!), and not as hard to ignite or unforgiving of reduced loads (though you won't get the most consistent results if you're way low).

And I second the suggestions that you just go with Starline brass. It's great stuff. I've loaded and re-loaded them countless times, and only ever had a handful develop a split - right at the case mouth, where it's supposed to eventually fail. You'll lose them to bushes and tall grass before you'll wear them out, most likely.