Help with 10mm heavies for subsonic use...

[Muskrat]

Where did you find published load data for 220 grain bullets?

Hodgdon reloading website.

Thanks...wonder when they added that bullet to their charts?

Interesting that the go-to powders for 220 grain aftermarket loads (800X and Longshot) aren't even on the list. Also interesting that Hodgdon lists max pressures at velocities WAY below what Underwood is generating. From a 6" barrel I get 1,226 fps from the Underwood 220 hardcast...almost 25% faster than anything Hodgdon publishes.

[sqlbullet]

Often when data is added it is for newer powders that get included in testing.  But except for CFE Pistol none of those are new.

And, I agree that they aren't suited to heavy bullets either.  Heavier bullets need slower powders.  Longshot would be the obvious choice in the Hodgdon line, though I would favor AA#9 personally.

But, at least they have data!

[BENTENMM]

I posted this back on Feb. 8th on a more local forum to me in GA. .40 sw brass loaded to 10mm oal @ subsonic speeds with GT Bullets 220gr Coated HP

Something like this.. I've been meaning to try the Sherwin Gloss Black.. GT Bullets 220gr HP. The seating depth actually works for a Lee factory crimp to put it right on the edge of a lube groove. I loaded up some at .40S&W pressure and some at 10mm.. for a 10mm. 500 ft lbs. Subsonic.


.40S&W Nickel Brass Sized & Gauged 12 Pieces Avg. .844"
Powder: MP275/Longshot
Primer: CCI No. 550 Magnum Small Pistol
Bullet: GT 220gr Stripped/Cleaned Powder Coated
Weight: 216.63gr AVG. Length: .701" AVG.
COAL: 1.260" Seating Depth .285"

.40S&W SAAMMI CASE MAX IS 35,000 PSI/10MM 37,500 PSI
SPEED OF SOUND DEG F 12 - 1064FPS 32 - 1086FPS 52 - 1108FPS 72 - 1130FPS 92 - 1151FPS SPREAD OF 65FPS

Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time % Grains fps ft.lbs psi psi % ms

70 7.36 1025 506 30720 3939 98.6 0.594 ! Near Maximum !
71 7.44 1035 515 31541 3978 98.8 0.587 ! Near Maximum !
71 7.52 1044 524 32379 4015 98.9 0.580 ! Near Maximum !
72 7.60 1053 533 33235 4051 99.1 0.573 ! Near Maximum !
73 7.68 1062 542 34109 4086 99.2 0.567 ! Near Maximum !
74 7.76 1071 552 35002 4121 99.4 0.560 !DANGEROUS LOAD-DO NOT USE!
75 7.84 1080 561 35913 4155 99.5 0.554 !DANGEROUS LOAD-DO NOT USE!
75 7.92 1089 570 36844 4187 99.6 0.548 !DANGEROUS LOAD-DO NOT USE!
76 8.00 1098 580 37795 4219 99.7 0.542 !DANGEROUS LOAD-DO NOT USE!
77 8.08 1106 589 38765 4250 99.8 0.536 !DANGEROUS LOAD-DO NOT USE!

Both load pressures tested fed, shot, and ejected great out of my 5" 1911 & 16" PCC. Very pleased with accuracy, aside from more drop at longer ranges

I LOVE GT BULLETS! Powder coated and loaded all sorts of ways.. I sent out an email looking to purchase 3k unsized/unlubed last week and haven't heard anything back as of yet.. (damn virus) I have loaded the "220's" (actually 216ish) all sorts of ways. My 16" PCC Loves them at 1,350 15.-2" groups @ 50yd and Clay pigeons @ 100yd all day. I have been toying around with some other ideas and will be using various other bullets.. Most of which will be .41's sized down to .401. I have tried PP, Clays, 2400, MP275/Longshot, 800X, & NO. 9..

Here are a few links.

.41 Caliber 295 Grain Truncated Cone Bevel Base SSK
https://www.pennbullets.com/41/41-caliber.html

GT Bullets 250 Grain Wide Hollow Point bullets 41 caliber
https://www.gtbullets.com/index.php?main_page=product_info&cPath=6&products_id=47

Missouri Reloading Bullets .41 Magnum 41 Outlaw 225 Grain Round Nose Flat Point
https://www.lg-outdoors.com/Product/Details/5661099?source=A10001


I actually just traded 100 - .308 168gr SMK's & 200 New Starline 10mm Brass for 4lbs Sealed Hodgdon Universal. Quickload is showing me fantastic numbers as far as case fill vs. the subsonic velocities I want. Still lots of combos to try out, another reason to Love the 10. There's not a whole lot of info out about this kind of stuff and I never thought anyone else was as interested as I am.. Like you said, against the Grain..

Happy & Safe Reloading to you! -Ben

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[Muskrat]

Often when data is added it is for newer powders that get included in testing.  But except for CFE Pistol none of those are new.

And, I agree that they aren't suited to heavy bullets either.  Heavier bullets need slower powders.  Longshot would be the obvious choice in the Hodgdon line, though I would favor AA#9 personally.

But, at least they have data!

Ya, I couldn't make heads or tails out of the powders they list for the 220 Rim Rock...Other Hodgdon powders have proven to be much better.

I've got several pounds of AA#9 to play with, so I'll work up some loads. I previously stopped at 9.5 grains...not sure why, but I was probably looking for USPSA loads for my 10mm. That load gave me just shy of 1000 fps, with very good accuracy. Now I just shoot .40 S&W for USPSA, as I got tired of loosing so much 10mm brass every match.

[sqlbullet]

The nice thing about #9 is it is just barely fast enough for 10mm.  Pretty much if you can seat a bullet on the charge without it backing out, it is still safe.  Not that this is a valid reload technique