My brother just bought a Kimber Gold Match in .40 S&W.  What's the best magazine for this caliber?  9 rounders would be best (for IDPA).

On Brian Enos's web page, I see that he advertises regular Wilson-Rogers magazines as working well for both .45 and .40.  Any thoughts on that?  Would we have to load them long to get them to feed right?  The magazine that came with it has a "block" on the back, to keep the round towards the front of the gun.

Thanks for any advice.

Only seen kimbers work with factory ammo. the STI magazines would have feeding issues using factory ammo. Note this was only on 1 sti single stack 40.

If you reload loadding long for the 40 generally improves feeding issues. I load mine at 1.163-1.165 for a Edge no feeding issues.