6mm TCU

[kevinbear]

KB,

The Hornady 204 brass is excellent, what I'm using. Winchester's 204 brass is cheaper at $26/100. Using that brass for the CPT loads should be just fine, but for rams, given the higher pressure load, I'd go with the Hornady brass. The ram loads for the 6-04, 6.5-04 and 7-04 will all have about 55,000 PSI of pressure. The tougher Hornady brass should last while the Winchester might suffer from loose primer pockets after a few firings. That happened with my original 6.5-TCU, so Lapua brass was used for the ram loads, Winchester for CPT loads. Norma is excellent, but more expensive at $62/100.

The 6-04 will not have an advantage over the 6.5-04 with respect to wind deflection. But, the 6.5-04 will perform much better on rams with the 123 SST bullet for only a small increase in recoil.

For a 6-04, HP Hunter rig weighing 8.5 lbs, the recoil would be about 7.2 ft-lbs when launching the 107-gr SMK to 2,800 fps.

Did you mean to say that the 6mm would beat the 6.5 in wind deflection? Your use of the word "But" to start the next sentence made me wonder.

[DanDeMan]

KB,

The 123 SSTs fired from a 6.5-04 will have less wind deflection than a 6-04 firing 107 SMKs. And, the 123 SSTs will take down rams with more authority than the 6mm, 107 SMKs. That is what I wanted to say in my earlier post.

[kevinbear]

Thanks for the clarification. Those pesky 6.5's always seem to find their way to the top of the heap.
kb

[Bob Mc Alice]

(dec. 2012) That was some good reading, Dan. I had no idea you were/are that into cartridge design and experimenting. Keep us informed on progress with the 7-04 rifle. I am looking forward to reading a full blown, in depth shots fired report. I would expect no less from you.

[malinois]

Ok so who has said special reamer and does the work on these tcu and Br barrels...to get the most from these rounds.

[Jerry G]

Just shows you how good they are kev. I don't care what bob says.

[HLJimi]

Dan,

It's been over a year. Would love to hear how the 7-04 turned out!

HLJjmi