7mm TCU
I posted this in the Reloading Forum, but haven't gotten any responses.
Nononsense, I know that you probably know the answer. Thanks.
Here is the story. I picked up a couple of 7mm TCU barrels for hunting/silouhette shooting. I also was given a bunch of .222 Rem Mag cases. They are new. After necking them up, bumping the shoulder back and A LOT of trimming, I had some TCU cases ready to be fire-formed.
I have a bunch of Hornady 139gr SP bullets that I use with my 7-08 so I figured I would use them for my fireforming loads. I also had some IMR-3031 and H4895. My Hornady manual listed 25.3 grains of H4895 as the starting load. This load filled the case to the shoulder. When I checked Hodgdon's website for loads with IMR4227 (which I also have) I noticed that Hodgdon lists the MAX load with H4895 at 25.0 grains. Why the disparity?
The other question is this. With IMR-3031 one grain above the starting load (25.3 grains) fills the case all the way to the mouth. My manual doesn't list this as a compressed load. From what I saw of the difference between the .222 Rem Mag case and the .223 Remington (the parent case for the 7mmTCU) the only differences that I saw was the overall length and that the shoulder was farther forward on the .222 Rem Mag. So, I guess my question is, is 25.3 grains of 3031 a safe load in this case?
Nononsense, I know that you probably know the answer. Thanks.
Here is the story. I picked up a couple of 7mm TCU barrels for hunting/silouhette shooting. I also was given a bunch of .222 Rem Mag cases. They are new. After necking them up, bumping the shoulder back and A LOT of trimming, I had some TCU cases ready to be fire-formed.
I have a bunch of Hornady 139gr SP bullets that I use with my 7-08 so I figured I would use them for my fireforming loads. I also had some IMR-3031 and H4895. My Hornady manual listed 25.3 grains of H4895 as the starting load. This load filled the case to the shoulder. When I checked Hodgdon's website for loads with IMR4227 (which I also have) I noticed that Hodgdon lists the MAX load with H4895 at 25.0 grains. Why the disparity?
The other question is this. With IMR-3031 one grain above the starting load (25.3 grains) fills the case all the way to the mouth. My manual doesn't list this as a compressed load. From what I saw of the difference between the .222 Rem Mag case and the .223 Remington (the parent case for the 7mmTCU) the only differences that I saw was the overall length and that the shoulder was farther forward on the .222 Rem Mag. So, I guess my question is, is 25.3 grains of 3031 a safe load in this case?
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Was woundering if anyone has much expierence with this round in the field and how well it performed. I am thinking of having a barrel made for my TC Contender. Maybe for short range (60+/- yds.) on whitetail. Also open to sugestions. TIA, Bill
The shortest recordable time ever mearsured was from the time the light turned green and the lady behind you blew her horn.0 -
Hi,it's supposed to be a decent caliber and you'll have to hand-load it.I have a 6.5 TCU which is a little less powerful but still packs a decent wallop.
It's a .223 necked up to 6.5mm and in your case necked up to 7mm.
I don't see that they are hard to make up at all.Good Luck. [^] [^]
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Bill, I have used this round shooting in IHMSA,shooting silhouettes
out to 200 meters. I use a TC contender super 14" barrel. Case capacity is lacking so velocities are on the low side,but it is very
accurate and I also have a 10" barrel and I am working on some field
loads for whitetail hunting. I'm almost sure there is no factory ammo
for this caliber or any factory brass. The 14" barrel I purchased on a
complete gun in 1984 and it will still shoot almost one hole groups at
100 yrds. The best load so far is my silhouette load,25 grns IMR 4895,
Hornady 154grn SP,the primer I changed after a few years to a federal
small rifle bench rest. Brass is easy to come by since it is formed using .223 cases. The recoil from 14" contender is not bad at all.
I would suggest the longer barrel if you are thinking about a
contender. The longer barrel burns the powder better and you will get
approx. 250-300 fps more velocity. I am by no account an expert,just
giving you my 2cts. worth. Hope it helps. Happy New Year!
Dave0 -
Thanks men for the input, Dave I was thinking of maybe having a carbine set up in the 7 TCU with maybe a 16" or 18" barrel. already have one in .223 (SST Bull by T/C Custom Shop) so brass is no problem. I have taken 4 deer with well placed shots at up to 100 yds. with it. Its a very good shooter I may add. I was mainly woundering if the 7 TCU would be more adequate at this range with maybe a little more ass upon impact.
Example: With a 18" T/C Custom .223, RP case, CCI primer, I believe 25.0 gr. of 760, and a 55gr. Nosler Bal. Tip, at 65 yards this round did an explosive job (2/3 low just barely behind the shoulder on a 165 lb. whitetail). However there was no exit wound.
Is the 7 TCU my ticket????
Sorry for rambling.............Bill
The shortest recordable time ever mearsured was from the time the light turned green and the lady behind you blew her horn.0 -
The 7mmTCU has a edge on your 223 no doubt about that. Try the 120 Ballistic tip in one and you'll know what I'm talking about. Big explosive entrys
lack a lot of penetration, besides being messy that is.the heavier bullet in the TCU will stop a lot of that .[:)]
Gun control is hitting what your aiming at.0 -
Yea, Bill I have been working with the 139 SST hornady bullets,I
myself will have a 100 yrd or less shot where I hunt whitetail. I think you will get better kills with the heavier 7mm bullets. I like
the selection of 7mm bullets out there,barnes,nosler etc. The longer
barrels in your carbines should be awesome, I might have to get me one of those sometime. I have had good results with the SST Hornadys
in 30-06 and .270,one shot kills,probably about the same as Ball.tips
but cheaper. I think you will like the 7TCU and you have the brass to
start your loading,one more thing I have tried military and commercial
brass and found commercial to be easier to work with,can't tell much
difference in accuracy, but the military seems to be more brittle,I
guess its a bit more on the thicker side to hold up better for the troops. Well good luck with your choices and good shootin to ya.
burninpowder0
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