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Reloading 10mm question

This is a discussion on Reloading 10mm question within the Ammo and Reloading forums, part of the Gun Forum category; Set up my dies yesterday. Question about OAL and case mouth dimensions. Press: Hornady LnL AP Components: Starline brass, Hornady 180gr HAP bullets, CCI (not ...


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Old 06-29-2020, 12:41 PM   #1
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Reloading 10mm question

Set up my dies yesterday. Question about OAL and case mouth dimensions.

Press: Hornady LnL AP

Components: Starline brass, Hornady 180gr HAP bullets, CCI (not magnum) primers, Blue Dot and Accurate #9 (will work up loads).

Dies: Redding Competition Seater, Hornady Taper Crimp, all others are Hornady

Process (I do batches in three "steps"): De-cap and clean (if re-using brass), then size/prime/flare the case mouth, then powder/seat/crimp

Measurements: OAL set to 1.25-1.26, case mouth after crimp set to 4220-.4225, powder charge will work up loads using established loading guides

Question: any obvious issues? Case mouth is a little under what most guides test against (Hornady and Nosler show .423), but its little "wider" than most the factory ammo I have (typically .415-.420). OAL for most factory stuff is a little shorter, too (1.24-1.25).

My test rounds all chamber in my barrels nicely and pass using a Wilson gage.

I'm pretty sure no issues but figured I check with the experts
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Old 06-29-2020, 01:50 PM   #2
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Flare/bell the case mouth to allow 1/16" of the projectile heel/base to set into the case as not to shave bullet material or accordion the case wall.

Do NOT crowd magazine internal dimension or /ctg OAL.

Do the PLUNK test & dummy cycle test for best results.

Not familiar w/ Hornady HAP-sintered or cored/jacketed?

Hornady jackets are harder than a J4 type/Sie/Speer/Nos,so velocity will be 50-75fps slower than the softer jacketed projectiles.

Sneak up on the flake-Blue Dot powder charges when w/in 1-1.5 gr from published max,because it meters like corn flakes.

Accurate #7 runs well in 40 & 10mm also.

I won't publish my load since I'm running LR primers in my SIG P220R5 10mm loads.

Max pressure for a 10mm Auto is 37,500psi,the SAAMI standard/limit for pistol primers.
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Old 06-29-2020, 02:41 PM   #3
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Quote:
Originally Posted by DansSIGs View Post



I won't publish my load since I'm running LR primers in my SIG P220R5 10mm loads.
For others that may want to try this, be aware that large rifle primers are taller than large pistol primers and care must be taken to assure that they are seated deep enough.

Small rifle and small pistol primers are the same height, but that is not the case with large primers.
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Old 06-29-2020, 02:47 PM   #4
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Your loading procedure look OK to me. My favorite powder for both my Colt and Sig 10's is Blue Dot. You may find it a bit dirty however at the high loadings. I never liked AA#9 since it seemed in spiked pressures with just small powder increases using recommended loads.
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Old 06-29-2020, 02:54 PM   #5
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Behind a 180 grain bullet I like 14.0 grains of Accurate #9, or 10 grains of Blue Dot.
They both work well for me. Got to love the 10mm.
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Old 06-29-2020, 03:41 PM   #6
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Quote:
Originally Posted by DansSIGs View Post
Flare/bell the case mouth to allow 1/16" of the projectile heel/base to set into the case as not to shave bullet material or accordion the case wall.

Do NOT crowd magazine internal dimension or /ctg OAL.

Do the PLUNK test & dummy cycle test for best results.

Not familiar w/ Hornady HAP-sintered or cored/jacketed?

Hornady jackets are harder than a J4 type/Sie/Speer/Nos,so velocity will be 50-75fps slower than the softer jacketed projectiles.

Sneak up on the flake-Blue Dot powder charges when w/in 1-1.5 gr from published max,because it meters like corn flakes.

Accurate #7 runs well in 40 & 10mm also.

I won't publish my load since I'm running LR primers in my SIG P220R5 10mm loads.

Max pressure for a 10mm Auto is 37,500psi,the SAAMI standard/limit for pistol primers.
HAPS are XTPs with no serrations and a closed top.

My dummy rounds passed the PLUNK test, and I just loaded them in a mag and cycled them through -- no problems.

I expect I'll end up sticking with Accurate #9, or #7. I have a pound of Blue Dot so I'll give it a whirl but I do tend to like spherical powders for ease of metering.

Curious: why LR primers instead of LP primers?
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Old 06-29-2020, 06:18 PM   #7
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Mainer,
Not my first rodeo in the reloading department.
Primer pockets are cut to depth -.004" for the Lge Rifle primers w/ K&M primer pocket uniformer.

Dingleberrydad,
Which pistol are you reloading for?

L Rifle primers for the internal ballistics & total burn of spherical powders in the Arctic.
Accurate #7 & #9 will leave burnt powder granular throughout your pistol.

LgePistol primers are used for the Colt Delta,Spgfld Armory Omega(aforementioned retired 20+yrs ago),S&W 1006,1076,1086 & 1st Gen S&W 610's since they will NOT handle the pressure(s)


All reloads run through an Oehler 35P chronograph....nothing guestimated or read off a box top.
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Old 06-29-2020, 07:07 PM   #8
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Quote:
Originally Posted by DansSIGs View Post
Mainer,
Not my first rodeo in the reloading department.
Primer pockets are cut to depth -.004" for the Lge Rifle primers w/ K&M primer pocket uniformer.

Dingleberrydad,
Which pistol are you reloading for?

L Rifle primers for the internal ballistics & total burn of spherical powders in the Arctic.
Accurate #7 & #9 will leave burnt powder granular throughout your pistol.

LgePistol primers are used for the Colt Delta,Spgfld Armory Omega(aforementioned retired 20+yrs ago),S&W 1006,1076,1086 & 1st Gen S&W 610's since they will NOT handle the pressure(s)


All reloads run through an Oehler 35P chronograph....nothing guestimated or read off a box top.
Glock 20SF. Ported (Glock c ports) Alpha Wolf Barrel. Bought a KKM barrel...but never showed due to seller shenanigans, if it does I'll have that then, too. PS I'm in a relatively warm/hot part of CA.
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Old 06-29-2020, 08:02 PM   #9
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Quote:
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Glock 20SF. Ported (Glock c ports) Alpha Wolf Barrel. Bought a KKM barrel...but never showed due to seller shenanigans, if it does I'll have that then, too. PS I'm in a relatively warm/hot part of CA.
Don't push the pressure envelope w/ any Bbl in your Glock.

Any reduction of seated primer circumference radius.STOP.

F/L size said case & insert it into the chamber & attempt to rotate the case w/ finger pressure.

The unsupported case bulge will prevent case rotation.

Good Luck.
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Old 06-30-2020, 03:52 PM   #10
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Quote:
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Mainer,
Not my first rodeo in the reloading department.
Primer pockets are cut to depth -.004" for the Lge Rifle primers w/ K&M primer pocket uniformer.
I understand, but everyone that read your post may not have understood the need to modify the primer pocket. That is why I addressed my post to others that may want to do the same thing.

Last edited by Mainer; 06-30-2020 at 03:59 PM.
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Old 07-02-2020, 03:40 PM   #11
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Dbdad, Looks to me like you've done your due diligence in starting to load the 10MM. I've been a 10MM fan since it became available. Using a Bren Ten initially, I started reloading for it soon as dies became available. Back then, the only factory jacketed .400" bullet I could find was the Remington 180 JSP intended for the .38-40 cartridge. I've used AA-5, AA-7, AA-9, Blue Dot, Power Pistol, 3N37, and others. I only used pistol primers, but then Arizona is far from the Arctic.

I tended to load the 10 to the "real" 10MM ballistics, instead of .40 S&W level. I settled on AA-9 for max loads. Happy to say I never blew up or damaged any guns, or myself, with my hand loads. Though I'm down to only one 10MM revolver and one semi-auto now, over the last 35 years or so I've owned a dozen+ firearms chambered in 10MM.

Anyway, the 10 is a fine cartridge, capable of some pretty impressive ballistics, and I think you'll enjoy reloading for it
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Old 07-02-2020, 03:52 PM   #12
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Used to use Winchester action Pistol, still have some but they no longer sell it to my knowledge.
I believe there is someone else making this powder but I don't remember who it is.
used to load 180's to 1300 FPS with Starline brass and Federal Large Pistol primers.
That was shot out of a 6" S&W 610 revolver. 12.5 grains of powder.
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Old 07-05-2020, 09:37 AM   #13
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I'm late chiming in, but as others said, things look good. I don't understand why you process in batches if you are using an LNL AP, but that is your choice. Do be careful de-capping before cleaning if you are using walnut or corn cob--make sure none remains in the flash holes. Your powder choices are good, I've also used Longshot and Power Pistol with good results. Re: Zander's comment, Ramshot Silhouette (I haven't used it for reloading the 10) is supposed to be the same as WAP.
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Old 07-06-2020, 09:39 AM   #14
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I'm late chiming in, but as others said, things look good. I don't understand why you process in batches if you are using an LNL AP, but that is your choice. Do be careful de-capping before cleaning if you are using walnut or corn cob--make sure none remains in the flash holes. Your powder choices are good, I've also used Longshot and Power Pistol with good results. Re: Zander's comment, Ramshot Silhouette (I haven't used it for reloading the 10) is supposed to be the same as WAP.
I run them through a sonic cleaner....has worked well for me.

No special reason why I do it in batches. I find myself with spotty bits of time to do reloading, and breaking the process up just makes it easier for me to crank through specific steps and stay focused.
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