From the data I screenshot, for the Hornady fmjbt 55 gr, 24.3 is the recommended start load with a max of 27, this is from their data sheet I downloaded 2 days ago, I don't know what version you have, so I won't say you're reading it wrong, but I'm not seeing the same numbers you are.....Thanks! I have mixed brass so I've been loading for .223
Also just to be sure I'm not missing something, this what I find under
223 Remington > Ramshot TAC > 55 HDY BT-FMJ 23.2 3,018 25.8 3,293
Help me be sure I'm not looking at something wrong horsey300 please.
Sorry, I don't know how to do screen shots so I copied and pasted.
OK, thanks horsey!From the data I screenshot, for the Hornady fmjbt 55 gr, 24.3 is the recommended start load with a max of 27, this is from their data sheet I downloaded 2 days ago, I don't know what version you have, so I won't say you're reading it wrong, but I'm not seeing the same numbers you are.....
Just be safe and work up slow with 5 shot groups in .3 gr increments from 24.3 to 27 and see if it straightens out for ya, I've had keyholes only when understability was a factor, your twist is fast enough, so shouldn't be an issue at all really, BUT it's not impossible and in my experience, if the barrel is adequate, then all that's left is speed.......this may not be powder charge alone, addin a crimp will increase pressure, a short throat/too long oal will increase pressure, etc, lots of factors at play, so be mindful of your gun and how it's "acting" watch for the red flags, and if you hit 27 gr and still have keyholes from a clean barrel (especially after the first shot or 3) then you have different problems than charge weights...... Good luck sir!OK, thanks horsey!
Yes they can go a lot longer between cleaning assuming they arent collecting copper somewhere. However one thing you do need to watch out for in a chrome lined barrel is this: View attachment 903141
Wow, what make of barrel is that?
I'm certainly no expert, but I interpreted my similar swirls to be traces of molten lead coming through the exterior surface of the bullet, either because the exterior surface was defective or it was somehow compromised after I pulled the trigger.
the "word" was that the new 5.56 bullet was designed to tumble
have seen bullets completely disintegrate if they are thin jacketed bullets, intended for a 1:14 barrel but used in a 1:7;
I have seen that when plated bullets are giving up and have seen bullets completely disintegrate
As I recall, the slow spin of the early M16 1:14 barrels just barely stabilized the 55gr bullets so that when they impacted they often proved to be remarkably tumble-prone.Back in the '60s the "word" was that the new 5.56 bullet was designed to tumble ...
Was that target attached to a rigid backer that was not all shot up? If the target was moving around in the breeze or just attached at the top and allowed to move you might see what appears to be keyholing and it is the paper moving when struck.
Have you measured the dia of the bullets making sure there 0.224". I've received bullets over the years that were under size, 0.2235-0.223" . Normally you will detect a difference in neck tension if your paying attention..
I did, they varied from .223, .2235 and .224
Yes, yes. But what of the bug?
Seriously, though there’s your problem. Different friction amounts leading to not great groups, along side some so small they “ don’t take”, and keyhole.
Were the RMRs pulls or brand new? I can’t wait to see how they shoot...