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I need the brain trust here to help me out.
First: Can anyone post or send me a pic of the Hornady Service Rifle section for Hornady 150gr FMJBT. Want to see if Win 748 is on there. Bob at Angeles let me take a pic but I deleted the photo.
My old recipe was Mixed Brass FLS and trimmed to 2.05ish, 46 grains Win 748 and seated down to cannelure and then crimped (light). I was getting pressure signs so I dialed it back to 45 gr and increased length to fit Magpul Mag inner length as my modified case showed I was loading pretty far from lands (probably not a big deal). Got some decent results but again I do not know if the AR platform gas gun with stock barrel is capable of .5" groups on the regular with cheap, powder throwed rounds.
My cases have ceased showing extractor marks but have a little flattening to the primers and soot on the shoulder and case which shows not enough pressure sealing the neck. Now dialing back a full grain might have been too much but if flattening primers at 45 is a warning sign, would something as simple as increasing by .3 or .5 put me in the sweet spot?
Is crimping causing issues? It is not what I think as a heavy crimp its more of a Kiss the neck to seal on smooth part of the projectile.
Fired 10 round while dialing in a few rifles and velocities from my 308 Plinking Round above were ranging from 2603 to 2674 (not a good spread obviously and possible something serious, or my chrono sucks, its a Caldwell one with a decent amount of cloud cover). I meter 748 with a lee powder thrower and double check on a digital scale every 10 to 25 rounds and every time its right in the ball park +- .1.
Again random brass as its for plinking / stockpile range brass. Velocity issues could be because of that, maybe, but want to get your feedback guys.
First: Can anyone post or send me a pic of the Hornady Service Rifle section for Hornady 150gr FMJBT. Want to see if Win 748 is on there. Bob at Angeles let me take a pic but I deleted the photo.
My old recipe was Mixed Brass FLS and trimmed to 2.05ish, 46 grains Win 748 and seated down to cannelure and then crimped (light). I was getting pressure signs so I dialed it back to 45 gr and increased length to fit Magpul Mag inner length as my modified case showed I was loading pretty far from lands (probably not a big deal). Got some decent results but again I do not know if the AR platform gas gun with stock barrel is capable of .5" groups on the regular with cheap, powder throwed rounds.
My cases have ceased showing extractor marks but have a little flattening to the primers and soot on the shoulder and case which shows not enough pressure sealing the neck. Now dialing back a full grain might have been too much but if flattening primers at 45 is a warning sign, would something as simple as increasing by .3 or .5 put me in the sweet spot?
Is crimping causing issues? It is not what I think as a heavy crimp its more of a Kiss the neck to seal on smooth part of the projectile.
Fired 10 round while dialing in a few rifles and velocities from my 308 Plinking Round above were ranging from 2603 to 2674 (not a good spread obviously and possible something serious, or my chrono sucks, its a Caldwell one with a decent amount of cloud cover). I meter 748 with a lee powder thrower and double check on a digital scale every 10 to 25 rounds and every time its right in the ball park +- .1.
Again random brass as its for plinking / stockpile range brass. Velocity issues could be because of that, maybe, but want to get your feedback guys.
Bob B. 
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