17 tcm/17 9mm

[Chickenthief]

Originally Posted by foxhunter

just going by this article http://www.gunblast.com/RockIsland-22TCM.htmi realize the 9mm is based off the .223

Ohhhhh..... i do believe that DWM would claim that they designed the 9x19mm in 1902. The 223 is based on the 222 and that is from 1950.

http://en.wikipedia.org/wiki/9%C3%9719mm_Parabellum
http://en.wikipedia.org/wiki/.222_Remington
http://en.wikipedia.org/wiki/.223_Remington

But i could be wrong!

[bowfisher]

22TCM case that I filed the neck off of to get a good idea of case fill under the bullet. It held 13.6 of 300MP and 13.5 of AA2200.

[bowfisher]

Like Waska said, we are in the process, along with many others I'm sure, of necking it down to 17 and getting a reamer made. I will be doing a tight neck version that will require neck turning. Didn't get a chance to check neck consistency yet, have to cut a mandrel shorter first, lol



17VHA, 17/22 TCMx2 17FB and the 17/23SMc

[bowfisher]

I'd like to push the shoulder back a tad , to get more neck lenght, question is, how much does a guy need for a 17 cal ? This one is right at .180, IIRC. Might try .200 and see how that looks. Rays Boomer is .250, I want to go a little shorter than that to maintain a capacity edge over the 17Boomer, cause if I can't beat ray and Don, what's the point?!?!

[bowfisher]

Close up of the TCM next to my tightneck 17VHA for comparison. I think the neck lenght should at least equal the VHA, I know it works for accuracy..



17, 20 ,22 TCM and the VHA



I have to get a new shorter body die to get the shoulder back any farther, this is a far as my pbike527 tool will go. I'm going to see if Paul can send me another one .200 or so shorter.

[ray h]

Bow---- i like the idea of a .200 neck. My .250 neck is excessive on such a short case but I wanted Eddie to use an existing reamer. Using that reamer i had a series of cases made in .160 shorter steps. That was about 4 gr volume difference per step. I was expecting a bigger difference in velocities between them. I hope it works for you, good luck.

[Nor Cal Mikie]

My question is: "What's the reasoning for going to a 40* shoulder"?
Looks like all you're getting is more case capacity. And by going with the TCM necked down to 17, you're after less capacity?
Other than no easy availability of a bolt face for the 17 VHA, the VHA would be a better choice?
I liked the TCM case because it cut out most of the hard work of making a "short" version of the 20 VT.
Mikie likes most everything.

[Waskawood]

I am of the belief that a 40 degree shoulder gives you less case stretch, hence longer case life.

[ray h]

I just like the looks of straight side wall, 40* shoulder and long necks on a case. Most everything i have has some or all of these features.

[RareBear]

Originally Posted by bowfisher

I'd like to push the shoulder back a tad , to get more neck lenght, question is, how much does a guy need for a 17 cal ?

A chap by the name of Blaine Eddy used to hang out here and if I recall correctly, his rule of thumb was neck length = 1.5 x bullet diameter.