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Old Yesterday, 06:48 PM   #1
Dano86
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Join Date: January 29, 2014
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help needed, Bull 20 AR load question

I have a DPMS Bull 20 that I have been tinkering with some loads lately. Its a 1-9 twist and it so far LOVES the factory loaded 50gr Fiocchi ballistic tip rounds. So much so that at 100 yards its not a problem to get nickle and dime sized 5 shot groups.

Here's my issue... I absolutely love reloading and I want to replicate and improve on that factory load as best I can. How do you guys "reverse engineer" factory loads that your rifle likes, so that you have a good starting point to perfect them?
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Old Yesterday, 07:05 PM   #2
blarby
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Join Date: February 25, 2011
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You need something that records velocity, for starters. A chronograph.

If you want to make it specific.....


You have the bullet weight.


You work up the load with that bullet weight and style with your available powders until you get to the velocity of the factory load.

That should get you in the ballpark. Matching the identical barrel vibration and pressure is going to be difficult without the factory powder, but matching the velocity on workup should get you remarkably close.


I recommend the hornady 50gr vmax for your workup, likely the closest bullet you'll get to that fiochhi BT.
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Old Yesterday, 07:21 PM   #3
Dano86
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I do have a Chronograph and I have some baseline Velocitys on the factory rounds. I'm sure Fiocchi keeps it a secret but it would be nice to find out info on the powder they use. I have some Varget for my .308 but I've heard its a little slow burning for the .223
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Old Yesterday, 07:47 PM   #4
blarby
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Well there ya go.

Chrono a mag of the Fiochi, and give yourself a baseline.

Buy a box of 50gr BT bullets, start at the base load for varget and that bullet, and get to cappin !

You'll probably want to work up in .2 or .3gr intervals until you get close.
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Old Yesterday, 08:17 PM   #5
rcmodel
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I would guess it's not so much the factory power charge & type of powder as it is the Hornany V-Max bullets they are loaded with.

Any brand of plastic-tip bullets including the Hornady V-Max, Nosler Ballistic-Tip, and Sierra BlitzKing
are all accurate beyond expectations with just about any powder charge, in any accurate rifle.

I wouldn't spend too much time on figuring out the factory powder & charge.

I would spend it tracking down any of those bullets.

rc
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