Blown primer in .243 Ackley

[NEMTHunter]

Adam There is a Guy running 47.6 Grains of H4831sc with a 95 NBT. He is around 3140 FPS. Another runs 44 grains of the same powder with a 100 NP. tot eh tune of about 3050fps. Last but not least another guy runs 47.2 grains of same powder with 107smk bullets to the tune of about 3240 fps ..

 

[can1010]

Adam There is a Guy running 47.6 Grains of H4831sc with a 95 NBT. He is around 3140 FPS. Another runs 44 grains of the same powder with a 100 NP. tot eh tune of about 3050fps. Last but not least another guy runs 47.2 grains of same powder with 107smk bullets to the tune of about 3240 fps ..

that is good info for cup@core not monos, barnes pressure sooner and faster. only mono I seen that could use that info would be hammer but they have a unique bearing surface that allows that and I would start 4 gr less and work up

 

[NEMTHunter]

that is good info for cup@core not monos, barnes pressure sooner and faster. only mono I seen that could use that info would be hammer but they have a unique bearing surface that allows that and I would start 4 gr less and work up

that is good info for cup@core not monos, barnes pressure sooner and faster. only mono I seen that could use that info would be hammer but they have a unique bearing surface that allows that and I would start 4 gr less and work up

In all honesty I would start closer to 40 grains then work up from there. I always tend to start low and work up.

 

[adam32]

I just checked length, I was right about .025 off the lands, definitely not touching or jammed.

I'm gonna start again at 40gr and see what happens. I'll chrony them also this time.

 

[adam32]

Can you easily push or drop a new bullet in the fired case? Carbon build up in the neck area of the chamber can cause major problems, it won't let the case let go of the bullet. This usually won't happen for a couple hundred+ rounds, but I've seen it happen

Doesn't slide in and out super easy, but it will go with a little force.

 

[Deleted member 107796]

Remember that the old fashioned method of using a sharpie pen, to at least see if you're off the lands, keeps you off the lands. I know that measuring is best, but you cannot be on the lands.
Another question for you, did you crimp these?

 

[can1010]

back them up to .050 off for pressure test then move closer to tune group but not closer than .030 that is info I got from barnes years ago, they are different to tune. keep us informed in how things work out

 

[adam32]

I'm kinda thinking the carbon ring...I cleaned it and got a decent amount of "black" out of it.

 

[lancetkenyon]

I run 48gr of RL22 and a 105gr Berger and get 4-5 firings per case.

I know 46 is not starting super low, but then again it's not super high to cause a blown out primer? Maybe an ejector mark or something?? I dunno, just seems weird to me.

RL22 and H4831 are two different powders. You can't swap one for the other. Just because you can use 48 grains of one powder, doesn't mean you can use 48 grains of another powder.

Also, usually all copper bullets require less powder than jacketed lead bullets.

 

[adam32]

RL22 and H4831 are two different powders. You can't swap one for the other. Just because you can use 48 grains of one powder, doesn't mean you can use 48 grains of another powder.

Also, usually all copper bullets require less powder than jacketed lead bullets.

I know they are different powders, I was just saying that because they are similar burn rates compared to other loads I've seen. Even on QL, pressure wise they are similar in the Ack.

That's one thing that still has me confused, on QL with a 95gr TSX it's still only showing 45k. In my experience, QL usually reads higher than in real life.

 

[can1010]

the shot start pressure default is way off. use 12276 until you get some velocity readings. there are two ways to square up QL and they will have different pressures for same velocity. once you have chrony readings lower start pressure to match velocity and fine tune with powder BA

 

[SealT5]

It's inevitable when your brass is shooter than chamber length. Another member described what I was saying better about switching to a solid copper bullet. Reduce load way down in 1gr increments and work up until pressure signs. I learned not long ago that you pay no attention to what everyone else's gun is doing. It only take one time. You sound savvy. Goodluck with it

I'm kinda thinking the carbon ring...I cleaned it and got a decent amount of "black" out of it.

 

[zr600]

Personally in my experience a guy doesn't get his gun as clean as he thinks it is. I recently bought the Lyman borescope and could defiantly tell my guns weren't as clean as I thought. I use jb bore paste for the high carbon calipers or a heavily carboned barrel. You are burning quit a bit of powder. I would contact Barnes for load data they should be able to get you something close. Even if they just have 243 loaddata and not 243ai just start on the mid to higher end. My cousin has a 22-243ai I have a 22-243 he's using Lapua brass and I'm using Winchester brass and I'm pushing just as .5-1 grain more powder then he is with about the same pressure roughly actually he has a little more he was getting ejector marks and I'm not. His brass should have more case capacity but it's not showing that now. I'm shooting about the same FPS as him also and he has 2.5" longer barrel then me. To say all guns aren't the same is understatement.

 

[RogerPA]

Not suggesting other variables may well have created your excessive pressure issue, but I certainly have experienced situations with various lead free bullets that showed pressure issues at what would be considered "minimum loads" for lead-core bullets. Nosler's own loading manuals include this is warning for their E-Tip (lead free) bullets: "Due to internal construction differences, always begin with starting loads when using E-Tip products." Anyway, I'm interested in following your problem solving solution(s)...

 

[johnlittletree]

First where do you live that they require a bullet for hunting to be lead free outside of water foul hunted with a shotgun? That has to be the dumbest thing ever. If you want to drop animals quickly then you need lead.Lead free bullets suck as hunting bullets and even more so at long range target shooting. That is almost as stupid as Californias AR related laws and the like!