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Posted: 1/1/2012 1:36:52 PM EDT
| Hi guys, I've been loading H-335 @ 25.0 gr. under a 55 gr. Hornady FMJBT w/a CCI 450 primer and I like this load. It's easy on the brass and hits accurately at a 100 yards, further with the EOTech mounted. The brass I use is LC or other previously fired 5.56. Do I need to reduce my powder charge if I begin to load .223 cases? Or do I have it backwards? I've not had any signs of excess pressure. Also, any need for me to monkey around w/this load? Thank you. |
Using OCW method, I arrived at 25.3 gr. H-335 under Midsouth's 55 gr. Varmint Nightmare HP's as my most accurate load. I use FC & LC cases interchangeably without issue. In 5.56 / .223 there's not significant case volume difference. Weigh some cases & you'll see. The mil vs. commercial is a 7.62 thing. Note, this was using Tula SRM primers & no issues there either. 
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Agree with the group. The 556 versus 223 issue is not what determines what your particular brass will be.
Commercial ammo may not show which pressure standard was loaded in terms of the stamp on the case and it does not determine the internal volume of the case. Keep your case weights within a few grains and watch for the ones with smaller web thickness, they are out there. Take some data on your current cases. Weigh about 15 to 30 cases to determine the StDev and extreme spread of some sized and trimmed cases. Keep checking samples till you find ones at the high and low of the extreme spreads based on your StDev, or at least your two worst cases. Using the extreme samples, plug the primer holes with cleaned up dead primers. Place the case on your scale and establish the tare weight of the case samples. Now fill the cases with water and weigh the water weights. A small droplet of soap in the water can help with keeping the water level even in the case mouths. Once you know the case internal volume in terms of water weight, you can always check any new types of brass to know you are not jumping into the need for a load change. BTW, this same observation can be used in your application to determine if there is any value to case prep or weight sorting of your cases. Most applications don't matter, but mid range and long range shooting can be affected. YMMV |
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Quoted:
Hi guys, I've been loading H-335 @ 25.0 gr. under a 55 gr. Hornady FMJBT w/a CCI 450 primer and I like this load. It's easy on the brass and hits accurately at a 100 yards, further with the EOTech mounted. This is a common load. Your fine. The brass I use is LC or other previously fired 5.56. Do I need to reduce my powder charge if I begin to load .223 cases? Not unless you use PMP cases, they are heavy walled and weigh about 102-105 grs. Win, LC normally weigh about 90 grs. So reduce load in PMP cases 2 grains. 
Or do I have it backwards? I've not had any signs of excess pressure. Also, any need for me to monkey around w/this load? Nothing wrong with H-335, I just like Tac better due to it's more accurate in my AR. Thank you. I changed you post some to separate the sentences and make it easier to read and post answers. 
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