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Joined: May 2020
Posts: 628
Campfire Regular
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OP
Campfire Regular
Joined: May 2020
Posts: 628 |
Anyone really know the difference between a 6mm TCU and a 6x45 ? From what I have read, it is splitting hairs. Very little difference....
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Joined: Dec 2022
Posts: 89
Campfire Greenhorn
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Campfire Greenhorn
Joined: Dec 2022
Posts: 89 |
My preliminary understanding is that loadings for TCU are going to be more handgun centric. Faster powders from a contender.
6x45 will be for the AR guys, getting more velocity, likely using different powders, but with similar pressures.
Last edited by tCan; 12/05/22.
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Joined: May 2005
Posts: 6,536
Campfire Tracker
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Campfire Tracker
Joined: May 2005
Posts: 6,536 |
The TCU has a sharper shoulder. TCU cases must be fire formed. The 6x45 is as simple as necking up a .223 case and loading it. I don't have a 6mm TCU, but I do have a 7mm TCU and it is in need of fire forming too.
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Joined: Apr 2010
Posts: 8,148
Campfire Outfitter
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Campfire Outfitter
Joined: Apr 2010
Posts: 8,148 |
The TCU has a sharper shoulder. TCU cases must be fire formed. The 6x45 is as simple as necking up a .223 case and loading it. I don't have a 6mm TCU, but I do have a 7mm TCU and it is in need of fire forming too. Could have fooled me. I’ve been shooting a 7TCU in a 700 I barreled up for nearly a decade. I’ve always just ran 223 through the sizer and rocked on. It’s always shot little groups with never an issue of any sort.
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Joined: Jan 2007
Posts: 11,465
Campfire Outfitter
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Campfire Outfitter
Joined: Jan 2007
Posts: 11,465 |
7 tcu should make an awesome suppressed cartridge. shooting like 175s or maybe a little bit heavier and a 7 twist.
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Joined: Oct 2008
Posts: 5,312
Campfire Tracker
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Campfire Tracker
Joined: Oct 2008
Posts: 5,312 |
7 tcu should make an awesome suppressed cartridge. shooting like 175s or maybe a little bit heavier and a 7 twist. Ive done a 7Grendle with really good subsonic capabilities and the Upper velocities are amazing with Speer tnt.
.... like tears in the rain
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Joined: Dec 2013
Posts: 2,609
Campfire Regular
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Campfire Regular
Joined: Dec 2013
Posts: 2,609 |
The TCU has a sharper shoulder. TCU cases must be fire formed. The 6x45 is as simple as necking up a .223 case and loading it. I don't have a 6mm TCU, but I do have a 7mm TCU and it is in need of fire forming too. Could have fooled me. I’ve been shooting a 7TCU in a 700 I barreled up for nearly a decade. I’ve always just ran 223 through the sizer and rocked on. It’s always shot little groups with never an issue of any sort. Then you don't have a 7 TCU, you have a 7 X 45. Have you looked at the fired cases and compared them to the loads you ran through the sizer. The TCU line of cartridges are fire formed with a much sharper shoulder
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Joined: Apr 2010
Posts: 8,148
Campfire Outfitter
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Campfire Outfitter
Joined: Apr 2010
Posts: 8,148 |
Yes the shoulder is sharper, but the shoulder on a 7TCU is so small the angle is nearly indistinguishable. And yes I’m sure I used a TCU reamer to cut the chamber and I’m using TCU dies. Are you and the above poster saying the cases need to be fireformed using Cream of Wheat or by jamming the bullet in the lands?
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Joined: Aug 2009
Posts: 9,919
Campfire Outfitter
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Campfire Outfitter
Joined: Aug 2009
Posts: 9,919 |
See no reason to have a 6tcu when the 6x45 exiists
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Joined: Oct 2013
Posts: 18,859
Campfire Ranger
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Campfire Ranger
Joined: Oct 2013
Posts: 18,859 |
See no reason to have a 6tcu when the 6x45 exiists Same could be said for about half of the cartridges out there.
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