Home Forums Hunting & Shooting General Big Game 200 NPT load for .300 WM

Looking to try 200 NPT's in my .300 WM.

Would appreciate pet loads for that combo.

DF

I recall MD recommending Ramshot Magnum for 200s in the 300 WM. I would look at their online data for charge weights.

I had a couple 300 wins that liked a near max charge of RL-22 and 200 grain Partitions.

I've used IMR 4831 in the past with great results. Starting at 68.0 grains working up from there until you see 2950ish fps (24 inch barrel) and call it good. I've used others, but I've been most pleased with IMR 4831.

Almost any powder slower than the 4350's will work, and they'll work too. Magnum and Retumbo will usually provide top velocities with good accuracy, but H4831, RL-22, or anything else in that range can do real well.

The tightest groups I've ever seen fired at the Nosler Ballistics Lab were with the 200-grain Partition in the .300WinMag.

The barrel was on an UltraLight Arms action and the four five-shot groups were: .000", .000", .000" and .000".

Holy CRAP!!! Impossible, but absolutely true.

Hey, I was standing there ... what can I say?

Blessings,

Steve

I have had good luck with Retumbo and the 200gr AB in the 300 win magnum.

Hey Steve, do you know what load Nosler used to shoot those groups?

Steve,

Wow! And some people claim Partitions won't shoot.

The first .300 Winchester I ever shot was an Ultra Light Model 28 that Melvin loaned me for a few months. In fact it was the first Ultra Light I ever fired. Worked up three loads, one with the 200 Partition, another with an accurate lot of 180 Grand Slams, and one with 165 Hornady Interlocks. Even outdoors, it would put three of each load into a composite 9-shot group under an inch. The most accurate load of the three, however, was the one with the 200 Partitions.

75 grains of H1000 and work up to 77 gr or 71 gr of H-4831 are good starting points. The 4831 load is near max

Not the NPT, but I got 2900-2950 fps with the 200 NAB using RS Magnum in 3 different rifles with 24" barrels. Accuracy was excellent. Retumbo and H1000 were too slow in the first one. JB recommended Magnum and it worked great so I kept using it in the other rifles.

My .300WM 200 NPT favorite powder was Reloder 22.

My friend, I have absolutely no idea.

Interestingly, it takes a lot of skill to shoot the rail guns well. You'd think that it would be a matter of BANG, BANG, BANG, but it is not. The barreled action recoils back along the two rails (or is it four rails?) and a consistent hand pressure must be applied as the unit recoils back.

I was told before that particular series of five-shot groups was fired that the 200-grain Partion in the 300WinMag was without a doubt the most consistently accurate combination that they shoot. Each lot of bullets is shot, so it was a test of a particular run of bullets.

When the results came back as they did, I was absolutely blown away. I'm not particularly a fan of heavy bullets, of Partitions, or of the .300WinMag ... but, there is was.

Yep, I still kept on shooting my boring .280 Ackley with 120Ballistics and .25-'06 with 100Ballistics. Some old farts never learn

Steve

Steve,

Very interesting stuff, I appreciate the info! Big fan of the 25-06 with 100 grain Ballistic Tips here as well. I turned quite a pile of deer and antelope into meat with that combination in my early years, before I started experimenting. Would have been just as well off to stop while I was ahead!

Have a great evening,
Billy

Friend John,

Gale Root told me that if I ever had problems betting Partitions to shoot to just shift to a little faster powder. Gale thought of powders like I do, like gears on in a transmission.

The Partition is basically a Mini� ball and the base needs to be flared in order to fit the bore properly. Often, shifting to the next faster powder increases accuracy ... and sometimes the difference is dramatic. The flaring of the open base is the key.

Experience has proved to me that two gears (of burning rate) is best, owing to fact that some propellants' performance degrades with lowering temperatures.

Garth had a helluva problem getting one of the Leupold range rifles in .338WinMag to shoot with ANY Partitions. I spent a day at the Leupold Range with him just proving that going a powder gear or two faster with Partitions pays INCREDIBLE dividends.

Garth is a believer now.

Blessings,

Steve

Steve,

Yes, our friend Chub told me that about Partitions quite a while back, mentioning Gale of course. I have often used it to my advantage!

I'm not fond of the .300 myself, though used to use it quite a bit, partly because I figured part my job was to try various cartridges. Used the .338 Winchester a lot too, and remembering what Chub said, found Reloder 15 a great powder for 210 Partitions! It gets almost as much velocity as the more conventional slower-burners, and superb accuracy. (Plus the load doesn't kick too bad--for a .338.)

Hope you and Karen are doing well! Lately it's been kinda like an old-time Montana here.

My Win Classic Stainless with a 24" barrel in .300 Win Mag, loves Retumbo powder and Fed 215 primers with 200 grain Partitions. Last time I chronographed this load, using 3x fired Win brass and a near max load of 83.0 grains of Retumbo, I shot several five shot groups at varying ranges from 100 to 400 yards. Velocity ranged from 2960 to 3020 and averaged 2990 fps for the fifteen shots I took. Five shot groups at 100 yards were about 1", at 200 yards 2" and just under a 4" group at 400 yards. Good enough for me. It sure did spit fire out the end of the barrel though. Interestingly, using a max load of 84.0 grains of powder resulted in lower velocity than the 83.0 grain load in my initial load development so I stayed with 83.0 grains for my hunting loads.

H4831 and H1000 are what have given me the best results in my 300WM and 200gr NPT. Good luck!

71-72g of H4831 is a good combo, but not the fastest.

A 300 win mag is my main big game rifle. And 200 NPs are all I shoot out of it. This may border on treason on 24hour, but I really hate experimenting with different loads or changing my load for the next hunt or game animal.

I built my rifle wanting it to be able to handle almost anything with one load.

So after we finished with the rifle I picked 200 NPs, win brass and 215 primers. Then started pouring different powders in. I settled on a max load, according to Nosler, of H4831.

I know other loads and cartridges will work, but so does this one, so I keep using it. Not that I'm a well traveled hunter, the rifle has only hunted Wyoming so far.

I figure I'm good until cape buffalo and even if I could ever afford it I'd probably go insane on the plane ride.