It occurred to me tonight that the deviation could be from the action unlocking prematurely. I had it happen with my delta gold cup years ago and a stiffer recoil spring fixed it.

Ive ordered a Wolff 22# spring and will test again with the same batch of ammo.

I would have expected better as well since it's advertised as 1250fps. I've never used Sig ammo though, so I'm not sure how consistent it is.

This was also just a quick 'throw the chrono out, pop off a few rounds and see what it says' test in the backyard before it gets dark.

There was a bit of deviation between rounds as well, the low being 1132fps and the high being 1205fps.

The barrel probably needs some breaking in as well. I'll have to run a few boxes through it and then do some real testing.

I can't believe how quickly Springfield got these out after announcing them.

It's been several years since I've handled an XD. I had the original HS2000 when it first got imported. The XDM is a pretty good improvement. The trigger on this thing is very very smooth for a plastic fantastic.

The funshop didn't have a big selection of 10mm ammo on hand, just the Sig Sauer 180gr FMJ and 180gr V-Crown.

I put 5 rounds of each through the chrono tonight and got the following results:

The FMJ chronographed an average of 1197fps - 573ft/lb

The V-Crown chronographed an average of 1176fps - 553ft/lb

I'm ordering some more loads and hope to do a side-by-side in the near future.