Downloading the 300 Win Mag

mleeber · October 27, 2010, 04:53 PM

Just picked up a TC Pro Hunter in 300 Win Mag. I was really after the frame but since my other Contender barrels do not fit the Encore line and the barrel was relatively inexpensive I decided to pick it up too. I would like to load rounds that are closer to 308 Winchester rather than getting beat up by the 300. Has any one tried this with any success?

Thanks!

mehavey · October 27, 2010, 05:53 PM

I asked QL to run the powders/fill ratios/pressures/velocity combinations and was surprised to see this option for a light load.....

Cartridge : .300 Win. Mag.(@)
Bullet : .308, 168, Sierra HPBT MatchK 2200
Cartridge O.A.L. L6: 3.340 inch or 84.84 mm
Barrel Length : 22.0 inch or 558.8 mm
Powder : Accurate 3100 (from 69.22gr to 71.4gr)

% Powder
Fill ..Wt ..Vel ..Engy Press %Brnt
96 69.22 2626 2573 40408 96.3
96 69.72 2647 2613 41314 96.6
97 70.22 2667 2653 42242 96.9
98 70.72 2687 2694 43191 97.2
98 71.22 2708 2735 44162 97.4
00 71.40 2756 2833 46544 98.0

No other listed powders fill the case as well or operate at such low pressures.
In fact you could theoretically drop it down to a 65.1gr (90% fill) for 33,680psi/2,459fps in that 22" barrel. (Add about 35fps for every inch over 22")

COMPARE with Sierra's 5th Edition showing AA3100 going from 69.3gr(2800fps in a 26" barrel) to 76.9gr(3200fps). That last is a compressed load 1/10 of an inch into the (extruded) powder.

GeauxTide · October 27, 2010, 07:51 PM

Handloader #258 has an excellent article on Reduced Recoil Loads. They don't specifically list the 300WM, but the Short Mag. If you've got any loading manuals, 4895, 4064, Varget, and RL-15 are the powders to try that will give 2750fs loads.

Shoney · October 27, 2010, 09:21 PM

Hodgdon Youth Loads

125 GR. NOS BT----H4895--46.0gr---2615 f/s--24,100cup--3.3oal
130 GR. HDY SSP---H4895--44.5gr---2546 f/s--23,800cup--3.25oal
135 GR. SIE SP-----H4895--44.0gr---2498 f/s--23,900cup--3.25oal

kraigwy · October 27, 2010, 09:25 PM

Get you a can of Trail boss, load the case to the base of the bullet, then use 75% of that amount.

Makes a dern pleasant round, and eliminates all the empty space in the case.

TXGunNut · October 27, 2010, 09:58 PM

Buy a .308 or 30-06 barrel & sell the 300, mleeber.
Welcome to the asylum!

October 27, 2010, 04:53 PM	#1
mleeber Junior Member Join Date: October 14, 2009 Posts: 6	Downloading the 300 Win Mag Just picked up a TC Pro Hunter in 300 Win Mag. I was really after the frame but since my other Contender barrels do not fit the Encore line and the barrel was relatively inexpensive I decided to pick it up too. I would like to load rounds that are closer to 308 Winchester rather than getting beat up by the 300. Has any one tried this with any success? Thanks!

October 27, 2010, 09:21 PM	#4
Shoney Senior Member Join Date: February 21, 2002 Location: Transplanted from Montana Posts: 2,311	Hodgdon Youth Loads 125 GR. NOS BT----H4895--46.0gr---2615 f/s--24,100cup--3.3oal 130 GR. HDY SSP---H4895--44.5gr---2546 f/s--23,800cup--3.25oal 135 GR. SIE SP-----H4895--44.0gr---2498 f/s--23,900cup--3.25oal __________________ I pledge allegiance to the Flag - - -, and to the Republic for which it stands….Our Forefathers were brilliant for giving us a Republic, not a democracy! Do you know the difference??? and WHY?http://www.wallbuilders.com/LIBissue...les.asp?id=111

October 27, 2010, 09:25 PM	#5
kraigwy Senior Member Join Date: June 16, 2008 Location: Wyoming Posts: 11,061	Get you a can of Trail boss, load the case to the base of the bullet, then use 75% of that amount. Makes a dern pleasant round, and eliminates all the empty space in the case. __________________ Kraig Stuart CPT USAR Ret USAMU Sniper School Distinguished Rifle Badge 1071

October 27, 2010, 09:58 PM	#6
TXGunNut Senior Member Join Date: January 16, 2010 Location: If you have to ask... Posts: 2,860	Buy a .308 or 30-06 barrel & sell the 300, mleeber. Welcome to the asylum! __________________ Life Member NRA, TSRA Smokeless powder is a passing fad! -Steve Garbe I hate rude behavior in a man. I won't tolerate it. -Woodrow F. Call Lonesome Dove My favorite recipes start out with a handful of used wheelweights.

October 27, 2010, 05:53 PM	#2
mehavey Senior Member Join Date: June 17, 2010 Location: Virginia Posts: 6,896	I asked QL to run the powders/fill ratios/pressures/velocity combinations and was surprised to see this option for a light load..... Cartridge : .300 Win. Mag.(@) Bullet : .308, 168, Sierra HPBT MatchK 2200 Cartridge O.A.L. L6: 3.340 inch or 84.84 mm Barrel Length : 22.0 inch or 558.8 mm Powder : Accurate 3100 (from 69.22gr to 71.4gr) % Powder Fill ..Wt ..Vel ..Engy Press %Brnt 96 69.22 2626 2573 40408 96.3 96 69.72 2647 2613 41314 96.6 97 70.22 2667 2653 42242 96.9 98 70.72 2687 2694 43191 97.2 98 71.22 2708 2735 44162 97.4 00 71.40 2756 2833 46544 98.0 No other listed powders fill the case as well or operate at such low pressures. In fact you could theoretically drop it down to a 65.1gr (90% fill) for 33,680psi/2,459fps in that 22" barrel. (Add about 35fps for every inch over 22") COMPARE with Sierra's 5th Edition showing AA3100 going from 69.3gr(2800fps in a 26" barrel) to 76.9gr(3200fps). That last is a compressed load 1/10 of an inch into the (extruded) powder. Last edited by mehavey; October 27, 2010 at 06:25 PM.

October 27, 2010, 07:51 PM	#3
GeauxTide Senior Member Join Date: April 20, 2009 Location: Helena, AL Posts: 4,424	Handloader #258 has an excellent article on Reduced Recoil Loads. They don't specifically list the 300WM, but the Short Mag. If you've got any loading manuals, 4895, 4064, Varget, and RL-15 are the powders to try that will give 2750fs loads.