I have shot 123 Custom Competitions out of my 22" 6.5x47. I didn't have the chrono out that day, but they were hitting targets at 1150 without an issue. 12.3 mils.Has anyone had experience running 120gr projectiles out of a 22" or so barrel? I'm looking at options to rechamber my cadex to.
What weight powder charge of 4895. I shoot 120smk’s out of my x47 sometimes because I have a bunch of them. I have been using Varget.The only 120 grain bullet that I shoot in my 6.5x47 is the Nosler ballistic tip. It’s pushed with H4895 to 2910 fps. That’s my hunting load. I’ve shot thousands of the 123 Lapua Scenars pushed with RL15 to 2930 fps. Velocities are from 24-26” barrels. I tried several different powders but these worked the best for me.
I’d hate to give that information out. That load is shot out of a well worn HH marksman barrel that is only used for hunting now. It was my first 6.5x47 barrel for competing in PRs. You will need to work up for your own safety. Probably start around 35 grains.What weight powder charge of 4895. I shoot 120smk’s out of my x47 sometimes because I have a bunch of them. I have been using Varget.
Thank you. Not sure what QL is but I like it.
Thank youI was running 123 Scenars at 2910 with 40.6 grs of h4350. Those 139 should shoot well if you can’t get those to shoot you have a problem with the barrel
Quick load. It’s a predictive loading programThank you. Not sure what QL is but I like it.
Carbon ring was my first thought. I scoped it, there was moderate carbonHow you cleaning? How often? Have you put a bore scope down it? Sounds like you might have a carbon ring.
Yes, and I hadn't thought about that until your question.Was there any rain or drizzle that got to your ammo or gun while you were running?
Ok, it may be that you have to inspect everything, make sure the chamber, barrel, and ammo are all clean and try again.but it is possible the loaded magazine was wet.
Hello, wath type/brand of head space bump gauge are the best for this caliber?
I use Hornady lock n load head space bushing C375 but Reading CIP plans I find that the head space diameter are not .375" but .3771...
Can this differenze make some fake measures on the head space finding?
Have in the market some head space gauge more precise respect to Hornady
Hello @diggler1833!I think that the Short Action Customs headspace comparator kit is more precisely machined than Hornady's, but it is also much more expensive. I use Hornady's, but I also allow for .001 error.
Modular Headspace Comparator – Kit
This kit comes complete with 4 inserts of your choice, one long body, one short body and the stand. Please make sure you select 4 headspace or bullet inserts. Save $55.00 compared to purchasing individually! *** Solid Bullet Inserts are for bullets similar to Cutting Edge Solids Lathe turned...shortactioncustoms.com
Regarding using the C375 insert from Hornady: just take a reading on your fired brass with it, and then adjust your sizing die for ~ .002 less. The shoulder angle is in a straight line from the case body to the neck...so your datum point won't make a difference in the result of your shoulder bump.
I wouldn't worry about the SAAMI specs at this point; just focus on your chamber dimensions. So you've fired brass and it is now expanded to fit your chamber. You need to full length size it down by 0.002-003" so that it will reliably feed and extract from your chamber.
The only problem occurs when your brass hasn't been sized, so that it is too tight for your chamber OR if you size it too much and you have excessive headspace.
So it sounds like you just need to bump the case shoulder a bit more until the bolt closes with a normal amount of force. Still, this is kind of odd behavior - usually 0.002-0.003" is enough for easy chambering. However, there are always outliers in any system.
Is the little bit of force cause by the case compressing the ejector?
That seems very odd to me. I wonder if there is something wrong with your chamber? Does new brass (out of the box) chamber without any force?
#1 How is your primer seating? If you are .001 or so proud (you can feel the primer above the case head) that'll do it too.
#2 What action are you using? Not all are created equal (at all). Is your trigger "timed" to the action with a hanger?(that's a whole other topic)
#3 What comparator set are you using to measure headspace?
#1 I decapsulated the shells
#2 I have a standard action, the factory one
#3 Hornady OAL gauge .375
Who made your factory action? Who did the barrel?
Cases without primers ensures that my #1 question is answered.
If you're greater than .003 bump, and you're having to force the bolt home, I'm currently suspecting something with either the chamber or bolt face/head.
Cover the case in ink and chamber it. Might not be headspace causing the bolt to have resistance
Hello again!
I've made some measurements about the space betwen the mouth of the brass and the start of the porction of the chamber for the ball.
The carbon ring area.
What are the correct space to leave for a correct expansion/delongation of the neck and prevention or minimum formation of carbon ring?
Attacched two snapshoot from the borescope.
Thanks!
Since you've chambered a piece of brass, and looked again with your borescope, let it "stretch" a little on you after firing before you trim again. You actually are fairly close right now as it is.
Trimming back to the length recommended in reloading manuals usually creates more of a gap there, while leaving your brass closer to the 'maximum case length' closes that gap a bit.
Don't forget to check that gap with your longest piece of brass each round of firing *after resizing*. You also never want to fully close that gap - because you want a little wiggle room for inconsistencies.
Hi,
since I moved to reloading for my rifle I look'd that the brass a bit longer than the standard 47mm (1.850") for this caliber fit without problem on the chamber.
For a bit longer I mean 47,1mm or so...
Now I trim with economic Lee Case Length ad Shelle Holder Kit.
This make a 46,85mm brass length.
Now I think to move on a table trimmer on combination with a 3 way trimmer likes RCBS, Forster.
Also Giraud(for a drill) if availlable on the EU...
I follow your advice at the next shooting session.
But how many clearance I need to leave a the neck elongation?
Thanks!
Ok, I understand your message!How much clearance is up to you. I really never let mine ever go beyond max case length in the manual. You will never eliminate the formation of a carbon ring, just slow its growth.
Ok for the trimming length.Really, I usually just trim the rest of the brass to my shortest case length for case uniformity, and clean my barrel (and carbon ring) every 125 rounds. Right now with this latest batch, I'm on my third firing of Lapua brass, and my shortest case is 1.845 - so I'm trimming everything to 1.845.
This is one of my trimming trouble.I also learned years ago not to over deburr the outside of the case mouth, or you'll form a ring pretty quickly too.
I have 6.5 CM with 915mps A-tip 135Gr. (Rem 700). CDX-30 is my second rifle.If you’re after speed, a 47 might not be the best choice in 6.5 chamberings
Thank you for your reply, Dogtown.26" is generally considered the best optimized barrel length for velocity. You can go faster with 28-30" but I've found it's not that much of an increase. The barrel profile really depends on how important weight is for you. If you're hunting and have to lug around a rifle for hours/days, then a lighter profile shorter barrel makes sense. If you're shooting competition where maybe weight isn't as important as recoil reduction, then a heavy profile long barrel makes sense.