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Confession time. I haven't purchased any reloading books, sans Nosler #3, since imr7828 was introduced, which I purchased for my 15 year old home assembled 7 rem mag 700/ mcmillan rifle.

I am preparing to reload for my 300 Wby 26" bbl rig in a few weeks when the "warden" allows me to bring it home ( a California thing) and I am looking for a range of powders for 150 to 180 grain slugs. It seems that the 180 is the best choice if loaded to max, both for velocity and trajectory, as it nearly duplicates the 150's, with more energy.

So I know I need to buy a few more pounds of 7828, and I only have one pound of IMR 4350 for my 7x57, and I have a pound of H1000. Any suggestions on which powders to stock up on, load resources, etc greatly appreciated.


All loads would be for deer/ elk.
Allen

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7828 and H1000 are PERFECT POWDERS for the 300 wby. Some remingtons don't have the free bore that wby rifles do and can get to max pressure alot quicker. If you had a normal wby I'd say you should work towards 85/7828 under a 180 and 87/h1000 under the same BUT WITH THAT REMINGTON you may hit max at about 4 grains under these loads. Work up carefully with a chrono. Also strongly consider the newer super bullets by nosler in the e=tip and barnes with the tsx. 150-165 grain solid copper bullets like these will do anything that the older cup and core 180's used to do.

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7828 gives the best velocity in my 2 300s. I can hit 84 grains and 3200fps with a 180 in Remington brass. H4831sc has given the best accuracy. Midway had once fired Weatherby brass for around 15 bucks a while back.

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How about some RL 25 it has worked well for me in 300 win,300 ultra,338 ultra,340 weatherby etc.


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Thank you very much.

Sounds like I may stock up on 7828, leaving the older batch for my , or my son's, lol, 7mm rem and the new batch for the 300. The 300 Wby is in an ultralight Wby Mk V, sorry for the remington confusion.

Allen

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300 Wby
84.5 gr's Imr 7828
CCI 250
180 grain bullet

This load equates to 3 shot 1/2" groups in mine.


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Allen....now I'm gonna do the "switcheroo" on you. I didn't know it was a wby ultralight. I REALLY HOPE it's not an early one as the first year or two of production they were really really crappy shooters. I and a bunch of friends got some of those guns and we all had trouble getting them to shoot.
I was about to get a re-barrel job as NOTHING WAS SHOOTING in that gun from 165-200's with all the popular powders. Then along came retumbo. In my gun 86 of retumbo under 200 accubonds was decent. Then I tried the 180tsx and worked up to just over 88 grains and......whoohoo....a gun that wasn't shooting better than 6" groups at 200 yds was now shooting 2"/300 yds. I have never ever seen a gun that couldn't shoot anything behave so much with another powder but it was a miracle. Anyhow..if you have a later model gun I think they have perfected them alot and you hopefully won't have trouble. Let us know how it goes....the balance and feel of the UL is wonderful.

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Thank you very much.

It may well be an early one, it was built in 1998 according to Wby. The only thing I have shot so far is Wby 150 Partition ammo that came w/ the gun. I have a stash of Nosler partition 180's and hope they are as good as the 180 tsx, or I will be getting them forthwith. Odd thing, I read early models wore Mcmillan, but this looks to be a B&C, air voids, etc.

The 5 rds I shot strung them vertically 3", but #'s 2-4 were in 3/4", cooled for #5 which makes a 1/2" using shots 2, 3 and 5. They all are in 3/4" wide, so the pattern is strung verticle and I suspect bedding and shooting too fast for the light barrel.
Just have to wait for the Feds to release her to me......

BTW, is the retumbo load in Wby/ Norma brass? I hear to drop 2 gns if other brass was used.

Thanks again

Allen

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With my 24" Vanguard. For 180's, 7828 gave best velocity, but H4350 gave better accuracy and still made 3160fps.

For 200's, I tried 7828 and RL22. 7828 gave better velocity, but I haven't shot for accuracy yet, ran out of time.

Good luck,

David

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The 2 grain rule between rem and wby brass is usually a good one but it didn't come into play much with retumbo. If I remember right there was a 40 fps diff between the two. I acutally found that my gun really likes the hornady match grade brass in 300 wby. It has about the same capacity as rem brass. The loads I quoted were hornady brass. The funny thing is if you get above 3250 with 180's (hornady brass) the primer pockets seemed to go really fast. Keep it at about 3220 and they stayed decent. I had bought a bunch of the hornady brass when it used to sell for about $25/50....now it's almost the same price as wby brass.
Also..the amazing thing with retumbo and the light barrel is I could keep shooting even with a hot barrel and it kept going to the same place....like I said...I couldn't believe anything as nasty as what I had could get so "likeable" with another powder.

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Thanks

I found some of your postings on Wby nation....

I have 100pcs Nosler brass(Norma), some bullets and a release of the lightweight gun to wait for, but will be loading for it in a few weeks. I need to buy a pound of retumbo...

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Allen

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Originally Posted by Reloder28
300 Wby
84.5 gr's Imr 7828
CCI 250
180 grain bullet

This load equates to 3 shot 1/2" groups in mine.


I can certainly vouch for that load. I use Fed 215 primers and get right at 3300 fps. I've been loading the 300 for about 15 years and before 7828 I used either MRP or it's clone RL-22 at about 80.5/81gr. jorge


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For Elk 200 Gr bullet with 83 Gr of 7828 Nosler III.


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FWIW;

Nobody has mentioned IMR4831, which surprises me.

I was using RL-22 in my 24" beautiful Claro walnut Vanguard until a fellow shooter at the range asked if I would chrono his l80gr load in a 26" Mark V. It registered 3245 (without correction)into tiny little groups. I asked what load he was using and he said a load out of Hornady's manual (Fourth Edition - the latest at the time), 81.8grs of IMR4831. I tried it in my Vanguard (Remington brass)and never went back to RL-22. Mine came very close to Hornady's results from a 24", Mark V. Always under an inch at 100, just shy of 3200fps.

Interestingly, I'd also tried IMR7828 and never got the velocity or accuracy of RL-22. Hornady's results were 100fps less than RL-22 or IMR4831 with IMR7828. The sole exception was with the heavyweight 220's. My results reflected Hornady's. YMMV. grin


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For my 300 Weatherby, it's 165 gr. bullets and H4831SC. That combo works great for me.

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Be careful with nosler brass....I've read a few posts where guys complained that it seemed to have less case capacity by a good margin (300 wby) and got alot of pressure on normal loads. This wouldn't seem right if norma is making it...however just thought I'd toss out a caution.

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I saw here that Federal is making the Nosler. The first brass I bought with my 300 was Nosler it did fine until I started getting up around max loads. I started loosing primer pockets and went to Remington and Weatherby. The Remington is a great buy for Roy IMO. I have loaded some of it up to 8 times in load development. Speer and last couple of Nosler manuals also used Remington brass.


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