6X45 VS 6TCU

[Sniper338]

6x45 vs 6TCU?

The TCU looks to be about the same thing but 40 degree/AI shoulder?

Any benefit besides brass not growing and looks?

 

[fredo]

Figure the same performance boost a .223AI allows over its parent case. I.E., enough to be worth the effort (on a bolt action)...

 

[MarkS]

6x45 vs 6TCU?

The TCU looks to be about the same thing but 40 degree/AI shoulder?

Any benefit besides brass not growing and looks?

Sniper,
Both are good rounds. The TCU's by Thompson had a very long throats, to seat heavy bullets. IF you want to shoot light bullets, check the reamer.

Mark

 

[centershot]

I love my 6mm TCU rifle. I built it on a Savage Action. It will shoot 75 grain V-max at 3000 fps and 80 Noslers at 2900 fps. This is with TAC Powder.

 

[bsekf]

I did this search about a year ago and decided there was not enough difference between them to care in a bolt gun. I went with the 6x45 with a 1 in 10 to save $60 for reamer rental. Couldn't be happier.

Now if I was using a Contender I would want the TCU to get the straighter case.

Bill

 

[JSH]

Have had both myself. Not enough to really argue about. I have read and seen some bolt repeaters that had feeding issues with the 6TCU, all were either fixed or fixable.
6-223/6x45 load and shoot no issues.
Jeff

 

[Sniper338]

Have had both myself. Not enough to really argue about. I have read and seen some bolt repeaters that had feeding issues with the 6TCU, all were either fixed or fixable.
6-223/6x45 load and shoot no issues.
Jeff

single shot borden... feeding aint a issue. Just didnt know if its worth the extra work.

 

[bsekf]

Not familiar with the Borden, but in a break open gun I would go for the AI type case of the TCU to reduce "pushback". No extra work with the TCU, except finding a barrel guy with the TCU reamer. Both have to or should be fireformed. I think the TCU dies are getting pricey too.

Bill

 

[fredo]

I did this search about a year ago and decided there was not enough difference between them to care in a bolt gun.

Bill

Having had my 6x45AI bolt gun for a few years now, can say that the "improvement" over standard is definitely worth the price of admission (for me)...

 

['Freak]

How ‘bout a 6mm from 204 Ruger brass …?

 

[centershot]

How ‘bout a 6mm from 204 Ruger brass …?

That would be a 6x47 Remington. Originally made with .222 Mag brass

 

[swd]

That would be a 6x47 Remington. Originally made with .222 Mag brass

Close but not quite. The 204 case has a bit different shoulder and slightly more capacity.

 

['Freak]

The 204’s slightly less tapered case body is also .075” longer from case head to the beginnings of its 30° shoulder.

 

[Jaybo]

I'm fixing to build a 6 mm TCU plan on shooting in the range of 70 to 95 grains bullets what would be the best Barrel twist for this

 

[swd]

I'm fixing to build a 6 mm TCU plan on shooting in the range of 70 to 95 grains bullets what would be the best Barrel twist for this

A few of the longer 95's need at least a 9". I had an 8" that did fine even with 70gr Ballistic Tips and shot the 95SMK's really well for playing around at LR.

 

[JSH]

Not familiar with the Borden, but in a break open gun I would go for the AI type case of the TCU to reduce "pushback". No extra work with the TCU, except finding a barrel guy with the TCU reamer. Both have to or should be fireformed. I think the TCU dies are getting pricey too.

Bill[/QUOTE

Never heard or seen it refered to as push back. I know what you mean or are talking about. Has not a thing to do with case taper in the MAJORITY of these issues on the TC. Those that have problems with misfires and brass issues on the TC platform don't understand them, it is a headspace issue.
My analogy on the break open rigs, anything you know or think you know about bolt guns gets thrown out the window.
Most ways of thinking was a rimmed case would solve problems and give positive ignition, but it darn sure does not truly fix headspace.
Thrust against the actions on the TC's is another ball of yarn. The 223 case for instance can be loaded to rediculous pressures with little ill effect. Move up in case diameter and things change.
Sorry for the slight derail but I would imagine there were way more 6TCU chambers than the 6x45 on the TC platform.

 

[fredo]

My 6x45AI has a 1:8 Krieger. It shot 70s ok while fireforming, but I was shooting some old 6x45 ammo from another rifle.
The 1:8 really hums with loads tailored to 80, 87 & 95grainers. Super little round, you're gonna LOVE it!

Have fun

 

[muleystalker]

How ‘bout a 6mm from 204 Ruger brass …?

Thats what I did, using a Redding 204 busing die with a 6mm expander and bushing and a 204 Forster Mic seating die with a 6mm stem. Expand to 6mm, load and shoot.

 

[Boyd L.]

Thats what I did, using a Redding 204 busing die with a 6mm expander and bushing and a 204 Forster Mic seating die with a 6mm stem. Expand to 6mm, load and shoot.

Hmmm...
I like it.

 

[GrocMax]

I like the 8 twist for everything my TCU varminter does.