1000yd 300 win mag load


November 15, 2011, 08:13 PM
looking for a 300 win mag load accurate out to 1000 + yds, currently shooting 190gr sierra mk hpbt winchester brass. anyone try the amax? 178 or 208?

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November 15, 2011, 10:39 PM
I don't have experience with the Amax 178 in 300 Win Mag, but I do shoot the Amax 178 out of my Rem 308 and the Amax shoots on par with the Sierra Matchking 175, just have to put a little more powder (.2 or .3 grains) behind the 178 to keep it on elevation. I suspect the Amax will shoot well out of your 300 Win Mag.

November 16, 2011, 01:33 AM
Got a chronograph?

(See disclaimer below)

Using R22, load the 190 SMK to about 2900 feet per second.
Shoot that and see how it groups.
Adjust up or down from there seeking best performance at desired long range.

A. I don't have any of my manuals open, you'll have to check your own manual for starting and max loads.
B. I shoot that velocity from a 300 Wby Mag, not Win Mag. I'm hoping your cartridge behaves similarly to mine.

[P.S. My Weatherby also gets good long range performance from 175 SMK loaded just above 3100 fps. Factory 180 grain load with Norma powder is right at 3300 fps, it shoots excellent groups up to 300 yards but the soft point square base bullet they use craps out after that. The SMK goes farther. I shoot AMAX in 223 only, not 30 caliber.]

November 16, 2011, 08:49 AM
I shoot 190gr SMK's in .300wm. The 208gr a-max does as good in my rifle, but not available locally. 220gr SMK is probably the best shooter for me, but not by much and the recoil is just a little too much for me. Couple more powders to try: H1000 and R25.

You mentioned Win brass. I use remington brass when I'm wanting a lot of trigger time at mod ranges. When I'm shooting for real groups, I use better brass. I can sort, uniform, de-bur... the rem brass and it still want give the consistent performance of quality brass.

Cop Bob
November 16, 2011, 12:41 PM
I don't load for the 300 Win Mag, but I do shoot a heck of a lot of .308, and the 168 gr A-Max is my money bullet...... for what it's worth... I shot the 168 Serria Matchkings for years, but I tried a box of the A-max's and have never looked back... .264 groups at 100 and she is holding close to 1/4 moa on out to 600.... when I can keep me and the wind under control... that seems to be the hard part for me...

November 16, 2011, 04:13 PM
I won many long range matches with 72.0 grains R22, RWS primer, Dardas 190 grain boat tail, and Winchester brass.

November 21, 2011, 03:19 AM

evan price
November 21, 2011, 05:27 AM
Amax is a good bullet. Why not pick a good candidate and do the same thing that you did to get your current load- load a selection, work the ladder. You can't expect that a load from one of us would work the same in your specific rifle even if it were the same type of rifle. Since you've mastered the intermediate ranges and are now going for the thousand yard club, you know that you need to do your homework and ladder up some test loads. What's that 190 Sierra lacking at the thousand line?

November 21, 2011, 03:12 PM
Having swapped barrels recently, I can vouch for the above.

My "great loads" from the old barrel have proven useless in the new one.

Ladder it up. Only way to go. Experiment with bullet weight, bullet type, with different combinations of powder type, powder weight, and once you get one or more that's sub 0.5 MOA, start playing a bit with overall length to see if you can hone it in.

On my last barrel (factory savage 112 stainless fluted), I was getting 0.3MOA (0.92" 10-shot groups at 300 yards was my average in 2010, according to the spreadsheet I keep).

99% of that last bit of accuracy comes from the reloading bench, not the shooter. :)

November 21, 2011, 08:57 PM
Great thread, i just started this week with doing 100 yard test with my first 300WM reloads. I use the 208Amax with 76g of H1000, and it did great, i experminted with 190SMKs and things are promising, but I bought my R700 300WM purely to eventually get a good 1,000 yard gun cause my local range is building a range out that far now (600 is our max now).

November 22, 2011, 02:40 PM
Lucky bugger. :)

Closest 1000 yard range to me is 2 hours away, and I *just* found out about it this week. Guess the range has been there since 1957, but I've never heard of it. (They don't have a website?!)

Previously (up til circa 2002) I used to shoot at a local farm, from one hillside to another, and we could get out to about 1100 yards. However, when the old owner passed away, the new owners were some farming corporation, and don't allow shooting on their property. From 2002 - 2005, I didn't have a place to shoot over 100 yards. (Sigh).

In 2005, I found a place to shoot at 500 yards, but that's been the max since then (and THAT is seasonal, as it floods frequently).

I've seriously toyed around with the idea of buying some farmland, and renting out plow rights, just to always have my own personal 1k range!

November 22, 2011, 07:31 PM
how much of a difference do primers make, currently using winchester. recommendations?

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