556 ammo question - Page 2

Metal god · November 29, 2023, 03:16 PM

I found this if anyone in interested . It shows the dimensional differences between all the 5.56 rounds . It's interesting if accurate

https://www.inetres.com/gp/military/...56mm_ammo.html

**Unclenick** · November 29, 2023, 10:35 PM

It's the same thing I linked to in post 18. Just a different host. It's copied from military tech manuals. Their information is not always reliable, though I don't have a reason to doubt that particular information.

hdwhit · December 9, 2023, 09:16 PM

I get good results in 223/5.56 with IMR-4198 in my 181- and 182-Series Mini-14s. It helps that maximum load is under 20 grains with 60 grain projectiles, so more rounds per pound.

My most consistent results are with IMR-3031.

603Country · December 10, 2023, 05:56 PM

Use 223 load data. Work up your loads for accuracy while looking for pressure signs. When you find your best load, load a bunch and go shoot. I use H335 behind Sierra 65 gr GK, and Lapua brass, and didn’t get that close to max loads, due to pressure signs. Same thing with LC brass.

November 29, 2023, 03:16 PM	#26
Metal god Senior Member Join Date: April 10, 2012 Location: San Diego CA Posts: 6,878	I found this if anyone in interested . It shows the dimensional differences between all the 5.56 rounds . It's interesting if accurate https://www.inetres.com/gp/military/...56mm_ammo.html __________________ If Jesus had a gun , he'd probably still be alive ! I almost always write my posts regardless of content in a jovial manor and intent . If that's not how you took it , please try again .

November 29, 2023, 10:35 PM	#27
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,093	It's the same thing I linked to in post 18. Just a different host. It's copied from military tech manuals. Their information is not always reliable, though I don't have a reason to doubt that particular information. __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle

December 9, 2023, 09:16 PM	#28
hdwhit Senior Member Join Date: June 22, 2017 Posts: 1,011	223 Loading I get good results in 223/5.56 with IMR-4198 in my 181- and 182-Series Mini-14s. It helps that maximum load is under 20 grains with 60 grain projectiles, so more rounds per pound. My most consistent results are with IMR-3031.

December 10, 2023, 05:56 PM	#29
603Country Senior Member Join Date: January 6, 2011 Location: Thornton, Texas Posts: 4,000	Use 223 load data. Work up your loads for accuracy while looking for pressure signs. When you find your best load, load a bunch and go shoot. I use H335 behind Sierra 65 gr GK, and Lapua brass, and didn’t get that close to max loads, due to pressure signs. Same thing with LC brass.