On my 6BR I'm at 500 rounds now and I've had to reduce the charge several times. After initial load development I was shooting 29.8 in a good node. After stepping down .2 and .2 again (because of hard bolt lift) I shot 29.4 this morning and got hard bolt lift and swiping. My accuracy is still great. Initial load was developed at 50 deg and today way 60. 107SMK Varget BR4. I don't have a chono.
Barrel speeds up, pressure rises?
- Thread starter mike a
- Start date
If you have a decent freebore say .093-.104 then I doubt your powder charge is too high at 29.8
Unless your scale isn’t telling you the truth, I suspect a brass issue.
I could be wrong..
1-You could try different brass
2-You can always run a short ladder to confirm the powder charge
3- when in doubt “ measure “
4- carbon build up?
Unless your scale isn’t telling you the truth, I suspect a brass issue.
I could be wrong..
1-You could try different brass
2-You can always run a short ladder to confirm the powder charge
3- when in doubt “ measure “
4- carbon build up?
Magnetospeed sporter, love it!
It dosen't have all the functions of the v3, but it does what I need it to do.
Ran it simultaneously with an ohler 3 screen,
From muzzle we had 3fps difference from muzzle to 15' away.
swd
Silver $$ Contributor
Lab Radar but my friends with Magneto Speed’s like them too.
Keith Glasscock
Gold $$ Contributor
You have just about a perfect round count for a good carbon ring. Do you have access to a borescope?
I'd say your brass over length or you have quite the jam on the seating depth. You could also have a bad carbon ring. Do you know your touch measurement? Do you know your chamber length? And do you clean the carbon ring?
I didn't ask what length you're trimming to. I asked if you know your chamber length. You can measure chamber with a chamber length guage or if you have a print of your reamer that will tell you what your chamber length is. How did you measure that jam? I just recently had a friend say he was jamming .005" and after we found actual touch it was .029" jam!! How did you clean carbon ring? Not here to beat you up but to help.
This is a Savage prefit Shilen Select Match 1/8. I don't know chamber length. I found "touch" by using stripped bolt until I could just see land marks on the bullet. I us a Wilson seater and I just turned it in .005. I installed this barrel using go and no go gauges and have it close. The stripped bolt close free on a go but not even close to close on no go. I use Butches and a bronze brush. I also use iosso but not yet. Guess I'll have to get a borescope too. Damn won't be shooting much!
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CaptainMal
Silver $$ Contributor
Actually blew primers out because of carbon fouling. Been a while but that sure was an eye-opener. Target, Rem 15 and H4895 are notorious for carbon build-up in all the 6 BR variations. Mine built, got hard and no amount of cleaning I knew of at the time worked. Had to replace that barrel and learned a proper cleaning technique from the whole experience.
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