6.5-300 Win mag

06 November 2001, 16:45

6.5-300 Win mag

I would like some starting loads for 6.5-300 Win Mag 26" barrel 140gr bt using the following powders Rx22+25 IMR7828 H870+1000
or if anyone has a load with a different powder (as long as I can get it here). All I have on hand is 7828.
tks
Rich

Enfields forever (both kinds)

07 November 2001, 05:57

Mark R Dobrenski

Say if you have a copy of P.O. Ackley's old book check out the 6.5 Mashburn Super. I have the 7 M.S. and the 6.5 is about what you are looking for.
I'd love to hear what you find out.

Dog

07 November 2001, 07:09

R Flowers

RR: I will list some loads that I tried in a custom rifle that was built on a Ruger action and had a 27 inch Douglas barrel. Since this 6.5 X 300 Win Mag is a wildcat, I have no idea of the pressures these loads generated and you are on your own if you elect to use them.

WW cases/Fed 215 Primers/Speer 140 spitzers:

74 grains IMR 7828 3429 fps average
68 grains MR 3100 3239 fps
69 grains MR 3100 3293 fps

R-P cases/ Fed 215 primers/Sierra 140 BT
68 grains MR 3100 3237 fps
69 grains MR 3100 3287 fps
68 grains H 4831 3246 fps
69 grains H 4831 3317 fps
67 grains H 4350 3293 fps

I hope these loads are of some use to you.
Again, this data is what I got in my rifle, start below these charges and work up.

Good Luck, R F

07 November 2001, 11:21

<Pumba>

RR,

I don't know of any data on a .256" (6.5mm) x 300 Winchester, but I have been shooting a .264" (6.71mm) x 300 Winchester since 1977.

My best results have been achieved with Winchester or Norma cases, Federal 215 or 215M primers, a 140 grain Nosler Partition, and H-870 powder.

My load is an ABSOLUTE MAXIMUM for MY RIFLE. I use 87.25 grains of H870 to achieve 3,380 fps muzzle velocity over a Oehler 35P chronograph with a 26 inch Krieger 3B barrel that has been fluted and Mag-na-ported. The rifle weights 7.0 lbs with a 3.5 x 10 - 40 mm Leupold scope, a 1.25" nylon sling, and 4 rounds of ammunition.

Please back off at least 10 percent before attempting to develop a load for your rifle.

Good Hunting !

[This message has been edited by Pumba (edited 11-07-2001).]

07 November 2001, 11:56

Canuck

quote:
Originally posted by Pumba:
I don't know of any data on a .256" (6.5mm) x 300 Winchester, but I have been shooting a .264" (6.71mm) x 300 Winchester since 1977.

Pumba,

We Canadians tend to stick with a lot of English/European conventions. To us (and most others really, except maybe John Lazzeroni), a 6.5 really is a .264, although I am sure you already knew that.

In case anyone that might be reading this is wondering what the heck I am talking about, the European metrics are measured at the land diameter, not the groove or bullet diameter. So, although 6.5mm really is equivalent to .256 inches, the groove diameter of a 6.5 calibre rifle is .264. Similarly, 7mm is really .2756 inches, but the groove diameter is .284.

Although it first glance it seems quirky, its really no different than naming a .308 calibre cartridge a .300 XXX Magnum.

Canuck

[This message has been edited by Canuck (edited 11-07-2001).]