Trying to help Glockandroll with some handloads using these components:
Winchester Brass w/flash hole drilled 9/64
Federal GM215M Primer
IMR SR-4759 powder
Sierra 220GR round nose
COAL 2.80
18.5" 1/10 twist bbl
G&R is on Jack Daniels single barrel....I"m staying sober so he doesn't F--k himself up.....
.308 subsonic loads IMR SR-4759
Don't use SR-4759 myself
Googling up SR-4759 didn't find much
http://www.handloads.org/loaddata/defau ... type=Rifle
173gr LFP 19.5 gr SR-4759 1,800 fps CCI LR guest
Lyman cast gas check .6" at 100 meters! from Savage tactical.
Googling up SR-4759 didn't find much
http://www.handloads.org/loaddata/defau ... type=Rifle
173gr LFP 19.5 gr SR-4759 1,800 fps CCI LR guest
Lyman cast gas check .6" at 100 meters! from Savage tactical.
"Trying to tax yourself into prosperity is like standing in a bucket and trying to pick yourself up by the handle." - Winston Churchill
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Thanks for the tip Artfull.Artful wrote:Don't use SR-4759 myself
Googling up SR-4759 didn't find much
http://www.handloads.org/loaddata/defau ... type=Rifle
173gr LFP 19.5 gr SR-4759 1,800 fps CCI LR guest
Lyman cast gas check .6" at 100 meters! from Savage tactical.
We worked up to 12.2grns of SR-4759 from 10grns in 5 shot incriments using the sierra 220 round nose.
We bored out the primer flash holes and used federa 215 magnum primers.
I had no idea that hand-loading would be so time consuming... but see's what BSP's rifle can do with good loads I'm a firm believer.
Dave - can you post some pics of your rifle and the groups?
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Found this also..
http://www.quarterbore.net/forums/archi ... t-280.html
http://www.quarterbore.net/forums/archi ... t-280.html
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Nope, in 13 years of loading sub rounds, I've never drilled anything and never had any problems. I do always use mag primers for a little extra heat. It can't hurt, but I've never seen evidence that it was necessary.
With a lighter pill and the few extra inches, you should still be in the sub range. I highly suggest using a chrony to develop sub loads. Without it, it may sound sweet, but you may be well below the 1050 mark and therefor creating unnecessary drop and energy loss. If punching paper, it's not a big deal, but if you want to chase hogs or other critters, it matters.
With a lighter pill and the few extra inches, you should still be in the sub range. I highly suggest using a chrony to develop sub loads. Without it, it may sound sweet, but you may be well below the 1050 mark and therefor creating unnecessary drop and energy loss. If punching paper, it's not a big deal, but if you want to chase hogs or other critters, it matters.
Rumlover
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G&R,
The speed of sound depends on temperature and less so altitude, mainly.
Sea Level, mach 1
0F 1116.4 fps
100F 1219.3 fps
5000 ft (in Colorado), mach 1
0F 1097.1 fps
100F 1201.64 fps
So... 1050 fps is safely subsonic for all temperatures and all altitudes at which you could shoot. unless... you were on top of a 20,000 foot mountain in the winter time, and testing your subsonic rounds.
The speed of sound depends on temperature and less so altitude, mainly.
Sea Level, mach 1
0F 1116.4 fps
100F 1219.3 fps
5000 ft (in Colorado), mach 1
0F 1097.1 fps
100F 1201.64 fps
So... 1050 fps is safely subsonic for all temperatures and all altitudes at which you could shoot. unless... you were on top of a 20,000 foot mountain in the winter time, and testing your subsonic rounds.
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Yup... and you are absolutely correct. I'm actually a licensed pilot and remember studing density altitude and how it affects take off performance, etc.
I'm really only worried about two things.
1. secondary explosive effect.
2. Bullet stuck in BBL.
Do any of you guys think that 10grains of this powder, with a 220grn LRN in reamed Winchester brass with magnum primers is a risk for either.
Honestly, I'm tempted to tie a string to the trigger for the 1st round or so.
I'm really only worried about two things.
1. secondary explosive effect.
2. Bullet stuck in BBL.
Do any of you guys think that 10grains of this powder, with a 220grn LRN in reamed Winchester brass with magnum primers is a risk for either.
Honestly, I'm tempted to tie a string to the trigger for the 1st round or so.