Frangible bullets and load data question

[Bullseye]

I read here recently, someone commented on frangible bullets having different load data than "normal" bullets of the same weight.
So before I load up these 55 gr bullets I got, I did a little looking around.
Yes there are a lot of favorite loads, bullets and powders for .223.
I generally load my lead core 55 gr bullets over 24 gr of Benchmark for acceptable shooting results.
I found this table on a webpage. See my question below data here in post #1.

RELOADING
Loading Data Sheet / FrangibleBullets.Com


To select the proper powder load for Frangible Bullets, a reloader will select the next larger standard lead-cored jacketed bullet in weight from a reloading manual. That weight will be the measured powder load suitable for FrangibleBullets as they are 30% lighter than lead or lead-cored jacketed bullets.

Frangible Bullet Weight -----Jacketed Bullet Weight 01/08
9mm 90 gr. -----115 gr.
9mm 100 gr. -----135 gr.
38 Super 121 gr. -----150 gr.
357 SIG 90 gr. -----115gr.
357 SIG 100 gr. -----130gr.
380 Auto 75 gr. -----100 gr.
38/358 95 gr. -----125 gr.
38/357 100 gr. -----140 gr.
38/357 110 gr. -----158 gr.
38/357 125 gr. -----180 gr.
40/10 mm 105 gr. -----135gr.
40/10 mm 125 gr. -----165gr.
10 mm 150 gr. -----200gr.
44 172 gr. -----225 gr.
45 ACP 140 gr. -----185 gr.
45 ACP 155 gr. -----200 gr.
223 36 gr. -----46 gr.
223 42 gr. -----55 gr.
223 50 gr. -----65 gr.
223 55 gr. -----72 gr.
243/6mm 62gr. -----80gr.
6.8/270 95gr. -----120gr.
308 125 gr. -----168gr.
7.62x39 .311 125 gr. -----168 gr.
45/70 300 gr. -----400 gr.
50 300 gr. -----400 gr.​

Due to the nature of reloading, FrangibleBullets.Com cannot accept any responsibility as to how ammunition is reloaded. Injury or death can result from the use of improperly loaded ammunition. Be sure to check with experienced reloaders if you have any questions on procedures. Only a gentle taper crimp is recommended during bullet seating. Excessive crimping can fracture the bullet shank and jam your rifle, revolver or pistol.

OK, am I to understand that when loading .223 55 gr frangible bullets, I should not use data from a loading manual for "normal" bullets like Hornady V-Max or similar of that weight, but to use data for a 72 gr "normal" bullet? In Blue
Or do I have things the other way around? Should I be using the data above in red?
Pretty sure I want to go with what I made colored Blue


Here's what they resemble, these are 42 gr. I have some of those too. ... ( random image I found )

 

[BigMacMI]

I have never done it... but it makes sense you would use the heavier load data... that woudl result in less powder. I am imagining that these bullets cannot withstand the pressure/velocity of a 'normal' FMJ or JSP/JHP

 

[rg1]

Check out this reloading guide for Sinterfire bullets. Might be useful to compare loads. If you see on-line manuals and see SF it means Sinterfire frangible bullets. https://www.sinterfire.com/Media/Files/2012-SF-Reloading-Guide.pdf

 

[Bullseye]

I appreciate you reading that Big Mac and rg1.
From what I am reading, these bullets can handle high velocities but are longer than solid core "normal" bullets and therefore raise pressure in the case.
So I looked at some 70 gr data on Hodgdon ( they don't have 72 gr and neither does Lyman #49 )
55 gr Sinterfire ( which is what I have I think ) starts at 21.0 gr Benchmark with a Max of 23.4 gr
a 55 gr jacked soft point "normal" bullet starts at 24.0 gr and Max is 25.6 gr Benchmark.

Furthermore

The 70 gr jacked soft point "normal" bullet starts at 20.5 with a Max of 22.8 gr Benchmark.
So it would make sense that the jacked soft point "normal" data should be reduced using these FRANGIBLE bullets.
In this case, it looks like I was right in my thinking and understanding that the BLUE data is right.
223 55 gr. -----72 gr.
I will use no crimp and start out with the 21.0 gr Benchmark using these 55 gr FRANGIBLE bullets.

 

[Bullseye]

Pumped out three. 2.195 COL
21.0 GR Benchmark
55 gr Sinterfire Frangible bullets
cases trimmed to 1.755
no crimp.
( these were my ugliest resized cases. )
View attachment 229553

 

[Walkalong]

They have a longer bearing surface for the weight than a lead core bullet. More bearing surface means more friction which means faster pressure buildup. Going up in bullet weight in a lead core would give you more bearing surface and be closer to the lower weight frangible.

 

[horsey300]

Yes I believe you have that right, I am curious though, are you going to play with the seating depth at all? I'm genuinely curious and interested as the sinterfires have been nagging at my brain and I hope you keep us posted on the results.

 

[Bullseye]

Sometimes it takes me awhile, but I almost always update my posts like this with my findings.
My buddy messes with lengths, so much off the lands and such, I'm less technical I guess. I try to make safe working ammunition that will work well and safely enough to get a job done.
I'm convinced that tweaking powder amounts and powder types improve accuracy, that bullet seating does make a difference. Neck trimming, meticulous headspace measurements, it's all good.
I guess I'm not into this for that. You could say I'm a reloader that works with what I have.
Then there are handloaders that want to get that perfect load. A 200-300 yd shot that hits where I want it to is good enough for me. I can understand the guys who figure in all the technical stuff and why they do it.
I still learn something new every day. I sometimes work up a better load withing the data for certain powders. Once I find one that works good enough, I'm pretty much satisfied. I almost always stay away from max loads, although clearly sometimes that is the most accurate posted in a manual. I'll still stay a tad below that.

I am being careful noting just how tight these bullets feel when I work my press.
They do warn of these frangibles and too much neck tension being a hazardous situation.

Yes I believe you have that right, I am curious though, are you going to play with the seating depth at all? I'm genuinely curious and interested as the sinterfires have been nagging at my brain and I hope you keep us posted on the results.

 

[horsey300]

Sometimes it takes me awhile, but I almost always update my posts like this with my findings.
My buddy messes with lengths, so much off the lands and such, I'm less technical I guess. I try to make safe working ammunition that will work well and safely enough to get a job done.
I'm convinced that tweaking powder amounts and powder types improve accuracy, that bullet seating does make a difference. Neck trimming, meticulous headspace measurements, it's all good.
I guess I'm not into this for that. You could say I'm a reloader that works with what I have.
Then there are handloaders that want to get that perfect load. A 200-300 yd shot that hits where I want it is good enough for me. I can understand the guys who figure in all the technical stuff and why they do it.
I still learn something new every day.

I am being careful noting just how tight these bullets feel when I work my press.
They do warn of these frangibles and too much neck tension being a hazardous situation.

I understand, I don't think I've ever tried getting near the lands, I was more curious about seating depth in relation to case capacity and pressures. I run my lil stubby spsx at 2.2 I THINK (I'd have to check in the morning) and I'm sure I'm nowhere near the lands, looking at these for a no-exit-capital-DEAD-right-there coyote bullet to as far out as I can hit them, after I read an article about using them on big game with multiple cartridges and how they work in a terminal capacity I was drawn, I just haven't talked myself into them yet lol. For what it's worth, I definitely prefer the idea of no crimp too, sinterfires site says to crimp very lightly so as to not screw them up, I don't crimp anyway so if they perform well without it, even better.

 

[Bullseye]

I think these might make deep moon craters on larger varmints and make the groundhops explode.
There will be no exit wounds LOL.
I don't crimp single shot, auto or bolt action rifle ammo. Only lever gun and revolver.
I do taper crimp my 9mm 40 S&W and 45 ACP.

 

[ponchh]

I load DRT 223 frangible. Can't say about others but the drt's have about the same bearing surface as a 68g HP. DRT has load data on their site. I crimp them like any other round. Best bullet I have ever shot bar none.

 

[horsey300]

I load DRT 223 frangible. Can't say about others but the drt's have about the same bearing surface as a 68g HP. DRT has load data on their site. I crimp them like any other round. Best bullet I have ever shot bar none.

If you don't mind my asking, shot at what? And what makes it the best?

 

[ponchh]

Deer . Found them looking for something for the kids to use in 223. These bullets are deadly.
Go to DRT site, go to the 79g 223 loaded round, there is a video there that will show what they can do.you can't help but be impressed.

 

[ponchh]

Forgot about to tell about one down side. I have 4 ar's the factory loads turn my rifle length gas gun into a single shot, mid length or shorter never had a problem. That is why I started loading my own with H335