Vit. 550 w/ 155 Gr. SMK

Glenner · September 27, 2008, 12:43 PM

How fast are you guys pushing the 155grain .308 bullets in the Palma matches?
I just tested a new load, I think it was too slow. It was 28 grains of Vit 550 and a 155 Grain .308, it was running 2720 FPS. Is that too slow to work out to 1,000 yards?

Loader9 · September 27, 2008, 06:03 PM

Sounds like your data is wrong. Starting load using N550 and Sierra 155 is 42.5 grs and that gets you 2479'ps per published data. I would imagine that 28 grs is flirting with a hang fire or a spike in pressure from powder positioning. If you don't have VV data, it's online here:
http://www.lapua.com/fileadmin/user_...oguide2008.pdf

I'm using a 190gr HPBT at 2700'ps and it shoots tight at 1000 yds out of a custom bench rifle in 30/338Mag.

Glenner · September 27, 2008, 07:04 PM

Sorry, I meant to say 48 Grains, not 28 Grains............
48 Grains got me to 2720 FPS.

The link you posted shows the same thing my book says for a 155 Grain Sierra Match King HPBT, start at 42.5 with a max load at 49.7 Grains which should come up to 2888 FPS.

September 27, 2008, 12:43 PM	#1
Glenner Senior Member Join Date: April 4, 2008 Location: Indiana Posts: 127	Vit. 550 w/ 155 Gr. SMK How fast are you guys pushing the 155grain .308 bullets in the Palma matches? I just tested a new load, I think it was too slow. It was 28 grains of Vit 550 and a 155 Grain .308, it was running 2720 FPS. Is that too slow to work out to 1,000 yards?

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September 27, 2008, 06:03 PM	#2
Loader9 Senior Member Join Date: July 29, 2008 Posts: 949	Sounds like your data is wrong. Starting load using N550 and Sierra 155 is 42.5 grs and that gets you 2479'ps per published data. I would imagine that 28 grs is flirting with a hang fire or a spike in pressure from powder positioning. If you don't have VV data, it's online here: http://www.lapua.com/fileadmin/user_...oguide2008.pdf I'm using a 190gr HPBT at 2700'ps and it shoots tight at 1000 yds out of a custom bench rifle in 30/338Mag.

September 27, 2008, 07:04 PM	#3
Glenner Senior Member Join Date: April 4, 2008 Location: Indiana Posts: 127	Sorry, I meant to say 48 Grains, not 28 Grains............ 48 Grains got me to 2720 FPS. The link you posted shows the same thing my book says for a 155 Grain Sierra Match King HPBT, start at 42.5 with a max load at 49.7 Grains which should come up to 2888 FPS.