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Topic: 22 Creedmoor (Read 132 times) previous topic - next topic

22 Creedmoor

First off, not blaming anyone for the issues I'm having.
Built a 22 creed with a 7 twist barrel so I could run the heavy high BC bullets.
At about 400 rounds, started to notice some of the bullets blowing up.
So cleaned the barrel good. So today went out to do a seating depth test,
groups were starting to open up and wanted to slow the bullet down to hopefully
help with the bullet blow-ups. Started off good and about 13 rounds into it
noticed my 3 shot groups were 2 shot groups and then got worse and about 1 in 3
wasn't making it to the target.  Here's my video I shot just today at the range.
You will hear me opening the bolt and single loading a round.  Just look at the little
white spot down range, that is the target and you will see a white poof. I just shot a couple rounds
while looking down range and this would happen. Took a couple times to get it on video.
Going to clean the barrel again and slow the bullet RPM's to 310,000 or less per a gunsmith's
recommendations.
Sorry won't let me download the video

Re: 22 Creedmoor

Reply #1
Here's a couple pictures and you can see in both that some of the holes
a ragged looking.  Guess those were ready to go too.
The first group is only a 3 shot group and the second is 2

Re: 22 Creedmoor

Reply #2
Gregg emailed me the bullet blow up video. Wish he could get on here - it’s impressive. Basically looks like the bullet hit a small water ballon 3/4s the way down the range. It’s the first video of this phenom I’ve seen where it was really evident what happened.

Re: 22 Creedmoor

Reply #3
I seen it as well.. hope he gets figured out what is causing it.. I'm shooting the same bullet at pretty much the same speed without issues.. did think I had one blow up the other day right at a 250 yard target.. but after looking at the plate I had just grazed it..
Grant

Re: 22 Creedmoor

Reply #4
Someone smarter than me could have change the format.
I just froze the video and took 2 pictures.  The white dot is the bullet
coming apart. The smaller dot is two frames before the second as the
bullet continues to blow up. 

Re: 22 Creedmoor

Reply #5
What bullet, weight, and speed ??

Keeping my bad Kharma intact since 1952

Re: 22 Creedmoor

Reply #6
Berger 90g vld @3300 fps
slowed it to 3250fps and the same thing.
Going to try 3100 range before I give up on the Bergers

 

Re: 22 Creedmoor

Reply #7
Have you had a chance to take a good look in that pipe yet Gregg. Wondering how bad the fire cracking is..
Grant