Edmo
US Veteran
Elmo,
I have three questions for you. What is the name of the grips you have installed on your 640 Pro Series? I know nothing about moonclips. Do moonclips interfere with the use of a speedloader. And do those grips interfere with a Safariland Speedloader?
Answers...
1) The grips are made by Altmont and you can see a pic of them here. The reference number about halfway down the page is 2399. You may find them cheaper elsewhere, but the linked page has a good pic and description.
2) Moon clips do not interfere with the use of a speed loader, but rather replace the need for a speed loader. My 640 Pro came with the back of the cylinder machined to accept moon clips. It can be loaded in four ways: With single rounds, with standard speed strips, via a standard speed loader, or with five rounds clipped in a moon clip. The rounds stay secured in the moon clip throughout the process of loading/firing/ejecting. In other words, once the rounds are snapped into the moon clip the rounds and moon clip stay as a single unit until you separate the spent brass from it. The one advantage is a faster reload than with singles and less bulk to carry spare ammo than with a standard speed loader.
3) I don't have a Safariland speed loader, so I'll make a guess based on my HKS speed loaders. Yes, these grips may provide some interference with a speed loader. However, it isn't bad. The slimmer moon clips loaded with 357 rounds seem to drop in with a little jiggle and with shorter 38 Special rounds there is no problem.
OBTW, although I'm quite cute and fuzzy, I go by Edmo not Elmo...

Edmo