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Junior Member Join Date: Feb 2008 Location: Reno, NV
Posts: 17
| 10mm loads in EAA Witness Compact
Yep, went out to the range to try out some loads in 9x23, .38 Super, .30 Mauser, and 10mm. I'll comment on the 10mm load here. The pistol is an EAA Witness Compact with the 3.6" barrel that has been ported. It has a 20# recoil spring and a Buffer Technologies shock buffer installed. For what it's worth I have mounted the Compact slide and barrel on a full-size frame. This is the load I tested: Cartridge: 10x25mm Barel length: 3.6" (ported) Powder: 13.0 gr. HS-6 Bullet: 155 gr. Cu-plated lead Cases: Mixed Primer: LP (M) MV: 1192 ME: 489 PF: 185 Everything worked just fine. Recovered brass looks almost like new. I am a little bemused by why this load got 1192 fps and the last test load of 12.5 gr. of HS-6 (half a grain less) got 1217 fps out of the same gun over the same chronograph. Yeah, I realise that the two velocities are essentially equal, but the lower one uses 0.5 gr. more of the same powder. Yeah, I have been weighing each charge on these tests, Last edited by bobclevenger; 03-20-2012 at 09:04 PM. Reason: Typo |
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Senior Member Join Date: May 2011 Location: Florida
Posts: 131
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What was temp and humidity levels on both loading and shooting days? In my "history", some reloads I did in summer that made major during the warm months, failed to make major during cold. Different batches of powder can have an affect of muzzle velocities, too. |
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Junior Member Join Date: Feb 2008 Location: Reno, NV
Posts: 17
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Both days were in the high 50's or low 60's. Don't know about the humidity except that it never varies a lot here in Reno. These were from the same can of powder.
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Junior Member Join Date: Jan 2004 Location: Greensboro, NC
Posts: 6
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Sometimes it has to do with burn consistency. A smaller charge may burn better than a heavier charge.....and whether the charge was closer to the primer when ignited (i.e. pointing the gun up vs. pointing the gun down prior to pulling the trigger. Also maybe the same powder, but different "lots" will burn slightly different.....Clean bbl vs. dirty bbl. A lot of variables. Just my .02 worth. Tracy
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Junior Member Join Date: Feb 2008 Location: Reno, NV
Posts: 17
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I'm beginning to think that I've pretty much reached the maximum amount of HS-6 that can burn efficiently in a ported 3.6" barrel. Going to try a slightly faster powder next time. Thanks for the ideas guys. |
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Junior Member Join Date: Feb 2008 Location: Reno, NV
Posts: 17
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OK, I have pursued this some more, trying a faster burning powder, namely Winchester 231. Chronograph was 15-20 feet from the muzzle. Cartridge: 10x25 Pistol EAA Witness (steel frame) Barrel: 3.6" with porting Powder charge: xxx gr. Winchester 231 Bullet 155 gr. Copper-plated lead truncated cone Cases: Mixed Primer:Large Pistol (Magnum) MV:1293 SD: 41 ME: 575 PF: 200 Yep, pretty much a MAXIMUM load for this powder, but it does perform better in that short barrel. Cases look fine, but the primers are showing some flattening. This load works in my pistol, but it may not in yours. Start a bit lower and work up carefully, please. I have been informed by a friend who has a computer program designed to estimate such things that the pressure developed by this load was over 100,000 psi. Not even I am that crazy. More work to do. That's why the powder charge has been removed. Last edited by bobclevenger; 04-28-2012 at 05:18 AM. Reason: Unsafe load. |
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Senior Member Join Date: May 2006 Location: near Huntsville, Ala.
Posts: 707
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Interesting results. Thanks.
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Senior Member Join Date: Mar 2011 Location: NOVA
Posts: 385
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Nice. I don't have much experience with the 10, but that seems quick out of a ported 3.6in barrel! ![]() May I ask? Is that a carry gun? I'd imagine that thing thumps with 155gr bullets. Very kewl. |
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Junior Member Join Date: Feb 2008 Location: Reno, NV
Posts: 17
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Yep, that is one of my carry guns. Thanks for the compliment.
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Junior Member Join Date: Jul 2017 Location: Northwest American Republic
Posts: 3
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No offense, but your friend is wrong. Winchester sells the 175gr silvertip and it is rated at 1293 fps using the factory version of 231. A charge capable of generating 100,000 lbs (greater than the 30-06!) would explode the barrel. I would estimate the charge in the low 30,000's. A good powder for the short barrel 10mm's is 800x or AA-7. | |
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