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Posted: 12/22/2015 12:55:35 PM EDT
Trying to load up these king coated 215gr bullets for 300blk in 2.26OAL but I'm failing miserably. King says to load them like any other bullet?
As you can see the bullets coating and some of the cast bullet itself is being skimmed off by the brass neck.... I loaded up the SAME brass with the SAME die and press with a 110gr Nosler and it loaded up just fine to 2.025. I managed to even completely collapse the neck of one of the 300blk cases! 
So what do I need to do differently with the coated bullets? |
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If you are not expanding the case mouth this will happen.
Get one of these. |
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First let me state that I have zero experience with coated bullets. But looking at your pics, I have a couple of questions:
1. Are you chamfering the inside of the case mouth? If you don't chamfer, you can even shave fmj bullets, so... 2. Are you crimping with the seater die? I crimp in a separate operation. I suggest that if you chamfer the inside of the necks, and do not try to crimp with the seater die, you may have more success. |
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You need to chamfer the inside, you should chamfer and deburr every time anyway, and, you need to flare the case mouth more. Whatever part of your sizing die expands the case, turn it a quarter turn and continue until you don't shave any more of them. If your die has a system that will also set the shoulder back further, don't go too far with it and set the shoulder back too far. You'd be better getting an expander die separate and doing an additional step.
Honestly, if it were me, I would just leave my sizing die set up for the FMJ stuff, and get a separate expander die for the lead and coated and do the extra operation. |
| Bell the mouth more. Using a larger expander plug with cast is not a bad idea too. These look like x39, but for 300 BO I use a modified 30 carbine spud in my powder drop die to expand the neck, and bell the mouth good. The crimp should be set just to remove the bell. |
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Quoted:
. King says to load them like any other bullet? ? Load them like any other CAST bullet. A cast bullet requires flaring/expanding of the case mouth. Y can use the Lee die as posted above or you can get a Lyman (M) die. Once you Fare/expand and then seat, you need to remove the Flare with a crimp die or the crimp feature built into your seating die. A simple chamfer is not sufficient for cast and coated bullets. |
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Quoted:
Load them like any other CAST bullet. A cast bullet requires flaring/expanding of the case mouth. Y can use the Lee die as posted above or you can get a Lyman (M) die. Once you Fare/expand and then seat, you need to remove the Flare with a crimp die or the crimp feature built into your seating die. A simple chamfer is not sufficient for cast and coated bullets. Quoted:
Quoted:
. King says to load them like any other bullet? ? Load them like any other CAST bullet. A cast bullet requires flaring/expanding of the case mouth. Y can use the Lee die as posted above or you can get a Lyman (M) die. Once you Fare/expand and then seat, you need to remove the Flare with a crimp die or the crimp feature built into your seating die. A simple chamfer is not sufficient for cast and coated bullets. Ditto, and go with the lyman M die, unless you have a lathe and can spin a M insert for the lee die. 
Hence on a two die rifle set, the inside of the neck is left around .304", which works great to hold a jacket .308" bullet. With a cast bullet Powder coated and then sized, your looking at a bullet that is around .308/310" instead. Hence when both the case neck is not flared to all the bullet to slip into the case neck without scrapping the buller, and the ID of the case neck just a touch to tight, the PC ends up getting scrapped off. So not only will the M insert flair the mouth of the case, but increase the top neck ID a touch to allow the bullet to pressure slip into place during bullet seating without any scrapping. |
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Why didn't I think of that!
I chamfered the inside of the neck with the hand tool and was able to load up 20 rounds easily. 
I will look into different dies as well. I have a .308 insert for my 3-way cutter coming soon so I can chamfer the inside of the neck much more easily with that in bulk. |
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I use an M die for 7.62x54R but for .308's I use a RCBS neck expander and it works good too.
Nice thing about the M die is you can often not crimp if you don't want to. Typically if you mouth flair you need to at least crimp enough to remove or at least reduce the mouth flare some so you get easy chambering. I think the lack of some kind of mouth flare is your problem but you may want to check your coating too. Is it fully curing? Will it pass the cube test? Motor |
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Those bullets look like they seat very deep into the case. This increases the chances for bullet shaving.
I have not loaded .300 blackout but all my bullet shaving issues with coated bullets have been fixed so far by adjusting flare(usually more than for jacketed) and not taking any flare out while seating bullets. I crimp later. You might also have oversize bullets but your post above sounds like you are getting better results already. I also read .300 BO cases can be made from .223 cases. These cases are more likely to have thicker necks that could affect your case neck diameter after sizing and a thicker/tighter neck could cause problems just like undersize dies can make problems seating oversize cast and coated bullets. |
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Another vote for the lee universal expander. I use allot of different expanding dies and the lee is top notch when it comes to coated bullets in the 30cal's.
I use the lee expander for coated bullets in the 223/308/30-06. I use a rcbs (called them and told them I was loading cast .311 bullets in the 308 & 30-06, they send me a 303 british expander for free) .310 (303 british) expander for traditional cast/lubed lead bullets in the 308 & 30-06. I use the lyman m-dies for all my pistol calibers (9mm, 38spl, 357, 44spl, 44mag, 45acp) Another place to look for custom expander plugs is neo bullet mold co. They make custom expander plugs for rifle and pistol calibers. http://noebulletmolds.com/NV/index.php?cPath=88 Nice looking bullets, I'm interested in how they perform/accuracy??? |
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Quoted:
I'm a little tired but I looked over the thread and can't seem to find the bullet diameter. What final diameter did you have for these after all your processing and just before you tried seating them? They are sized .309. The M Die may be your solution. We've had customers say they've used a 30-30 expander as well. |
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