Testing loads with 300win

Dannyboy303 · March 26, 2007, 12:37 AM

So i got bored on the weekend and decided to test some different loads, i usually go with 71.0gr of ar2209 with federal magnum match primers and Nosler BT150 Spitzers, which will generally give me a group of .6-8" at 100.
i tried from 70gr to 72gr in .2gr intervals and it spread the groups out to 1.5 with alot of those loads... i dont understand how just .2gr can make it spread so much. what loads do any of you guys put through your 300winmags to get the tightest groups?

VaFisher · March 26, 2007, 06:42 AM

I have two totally different loads for two 300 WM. One is a Browning Bar that likes 53.4 gr of 4064 and the other is a T/C Encore that likes 64.5 gr of 4064. I did not meantion the bullet size because the T/C load is a hot load but is fine in my T/C .

williamd · March 28, 2007, 10:17 PM

Never shot a bullet as light as 150g in a 300M! But, for 180g 72g or H4831. For 200g 70g H4831. Same loads work well in 7MMM with 160-165 g bullets 62g H4831. In 30-06 just fill the case and put your 150g bullet on top ... 58-60g. Note the H in front of 4831, please.

Dannyboy303 · March 29, 2007, 03:59 AM

Thanks for the replies!

I will order 500grams of H4831 and use some Nosler 180grain projectiles i have. As for 4064 i havent found anyone who stocks that. Still in early days of my reloading career, but its just great to test loads and see performance changes, love it!

Foxman · March 30, 2007, 03:19 PM

I have used 78gr reloader 22 behind Speer 165gr spbt, CCI 250 mag primers , scoots along at about 3100fps and groups into .5 at 100.
Also 180 gr Sierra gamekings Reloader 25 82gr federal 215 mag primer 3100fps and still around .5 at 100

cheygriz · March 30, 2007, 03:43 PM

I have a Remington Sendero heavy barrel .300 winMag with a Leupold 6.5X20 target scope. It likes 150 Sierra Matchkings, 168 Sierra Matchkings and 165 Nosler Ballistic Tips. I use RL 19.

I throw the powder straight out of the measure, and it varies by .2 to .3 grains plus of minus. My 10 (yes TEN shot group at 200 yards run 7/8 to 1 inch. Again, 200 yard, 10 shot groups.

If you're having accuracy problems with .2 variations, there's something wrong other than your powder charge.

March 26, 2007, 12:37 AM	#1
Dannyboy303 Senior Member Join Date: February 27, 2007 Location: QLD, Australia Posts: 116	Testing loads with 300win So i got bored on the weekend and decided to test some different loads, i usually go with 71.0gr of ar2209 with federal magnum match primers and Nosler BT150 Spitzers, which will generally give me a group of .6-8" at 100. i tried from 70gr to 72gr in .2gr intervals and it spread the groups out to 1.5 with alot of those loads... i dont understand how just .2gr can make it spread so much. what loads do any of you guys put through your 300winmags to get the tightest groups?

March 26, 2007, 06:42 AM	#2
VaFisher Senior Member Join Date: January 24, 2006 Posts: 596	300wm I have two totally different loads for two 300 WM. One is a Browning Bar that likes 53.4 gr of 4064 and the other is a T/C Encore that likes 64.5 gr of 4064. I did not meantion the bullet size because the T/C load is a hot load but is fine in my T/C .

March 28, 2007, 10:17 PM	#3
williamd Senior Member Join Date: March 13, 2007 Location: SoCal Posts: 801	Never shot a bullet as light as 150g in a 300M! But, for 180g 72g or H4831. For 200g 70g H4831. Same loads work well in 7MMM with 160-165 g bullets 62g H4831. In 30-06 just fill the case and put your 150g bullet on top ... 58-60g. Note the H in front of 4831, please. __________________ "Outlaw guns and only outlaws will have guns!" Unfortunately, we may be moving in that direction. NRA Benefactor, Conservative!, VN '64-'65. Never sell a gun or a car ... and retire rich!

March 29, 2007, 03:59 AM	#4
Dannyboy303 Senior Member Join Date: February 27, 2007 Location: QLD, Australia Posts: 116	thanks Thanks for the replies! I will order 500grams of H4831 and use some Nosler 180grain projectiles i have. As for 4064 i havent found anyone who stocks that. Still in early days of my reloading career, but its just great to test loads and see performance changes, love it!

March 30, 2007, 03:19 PM	#5
Foxman Senior Member Join Date: August 13, 2005 Posts: 466	I have used 78gr reloader 22 behind Speer 165gr spbt, CCI 250 mag primers , scoots along at about 3100fps and groups into .5 at 100. Also 180 gr Sierra gamekings Reloader 25 82gr federal 215 mag primer 3100fps and still around .5 at 100 __________________ Better the man suspected of being a fool keep his mouth shut, than to open it and remove all doubt.

March 30, 2007, 03:43 PM	#6
cheygriz Senior Member Join Date: May 11, 2002 Location: high up in the rockies Posts: 2,289	I have a Remington Sendero heavy barrel .300 winMag with a Leupold 6.5X20 target scope. It likes 150 Sierra Matchkings, 168 Sierra Matchkings and 165 Nosler Ballistic Tips. I use RL 19. I throw the powder straight out of the measure, and it varies by .2 to .3 grains plus of minus. My 10 (yes TEN shot group at 200 yards run 7/8 to 1 inch. Again, 200 yard, 10 shot groups. If you're having accuracy problems with .2 variations, there's something wrong other than your powder charge. __________________ If you think a mighty military force is expensive, wait 'til you see what a weak one costs.