Shot some 40SW Gold Dot 180's and measured the case web for reference.
Win cases trimmed to .8405"
Loaded 180gr,
CCI 500
VihtN340, 6.0gr
COL 1.130"
Velocity 966fps SD=9 FBI Lite+
Got same results with WSP primers.
Web expansion on the Speer cases was .4230"
Web expansion on WW cases exactly the same.
Looks like VihtN340 gives almost 100fps more velocity and recoil is about the same as 231. Brisk, and double tapping is easy.
Viht has a wider selection of burn rates in the AA5 range and the N340 in the 3" barrel burns close to 90-95% based on QuickLoad data where AA5 is in the 80% range. Muzzle pressure is about 1000psi lower than AA5 and that's a big plus.
I called SA and reported a 50% failure to chamber 1st round and a 30% failure during fire cycling with HP's. Linda said they could match the ramp length to the bullet if I wanted. I think they should have given at least another .010" length to the ramp. Out of 200 rounds.
All my hand loads had 100% success, mainly due to the extra COL. 200 rounds.
So, if your going to use Rem Golden Sabers or Speer Gold Dots it might be a good idea to take a caliper in the store and see which one has the greater COL or send the gun in for a longer ramp.