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Posted: 10/2/2011 4:09:20 PM EST
My son turned 10 years old today and he wanted to go shooting. I took the opportunity to take some of my other guns out (besides his Savage single shot .22 and my 10/22) and I had 6 rounds of USGI LC 11 headstamp M855 to run over the chrony. I put the chrony about 12-15 feet from the end of the rifle (20" Colt, 1/7 twist). 5 out of the 6 rounds registered at 3400 fps or faster, one registered 3399 fps. Isn't 855 supposed to be around 3100 fps at 78 feet from the muzzle? Granted, I was closer than that but it doesn't lose that much velocity in 60 feet does it? Temperature was low 70's.
Link Posted: 10/2/2011 4:43:43 PM EST
Something is wrong. M193 doesn't even do that.
Link Posted: 10/2/2011 5:04:46 PM EST
Your chrony was probably too close. As I understand it, if it's not far enough out the plumes of gas at the muzzle can cause phantom high results.
Link Posted: 10/2/2011 5:51:05 PM EST
Originally Posted By B_L:
Your chrony was probably too close. As I understand it, if it's not far enough out the plumes of gas at the muzzle can cause phantom high results.


Really? I didn't know that. I'll have to check that next time I go out. I sure hope that's all it was and it's not something wrong with my chrony. Guess I'll have to check my reloads as well.

Thanks for the info.

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