First just make sure it conforms to the rules
Are you shooting IBS score?
some of the tmbr I have seen look to be a fairly straight butt stock
Since you are building a Heavy Varmint Rifle, your stock options are wide open.
I had a TM years ago, way before Kelbly bought the pattern. I found it to be not very stiff.
I like stocks that are close to a Robertson, which was patterned off of the SG&Y of the mid 2000’s, which was patterned after the original Borden Anamovich(sp).
Of the ones you listed, the Kelbly Klub is closest to that.
By the way. See if they will put some extra material in the stock. You don’t want a 26 ounce stock on a HV. An extra 10 ounces in the stock in the right area will stiffen it quite a bit.
Also for a HV, Shehane makes some great stocks that are legal and look great.
http://scopeusout.com/custom-rifle-stocks/target-stocks/
As Jackie mentioned the Kelbly Klub is a copy of the Speedy / Borden/ Robertson unfortunately these are no longer made so the closest you will get to one is The Kelbly Klub.
I currently have 2 of them and they seem to be a good product. With that being said I also have 3 Robertsons and if still available would be my first choice by far.
Robertson stocks are being made in Canada under Felso composites . But I don't think they are making the one that was a copy of the Adomovich stock . Check out there web sight
That's how it's done. Do the homework and get it right the first time. Nice work!