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300 Weatherby Load Help

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Unread 02-18-2006, 04:07 PM
Silver Member
Join Date: Nov 2005
Location: south central pa
Posts: 215
Re: 300 Weatherby Load Help

i have shot a 300 weatherby in 1000 yard br competition.reloader 22/h4831 is what shot well in my rifle.it was chambered with a standard freebore reamer.i shot a variety of bullets.most were 220/200 smk's.so a freebore chamber can shoot very well if you "find"its nich or sweet spot.
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Unread 02-20-2006, 09:09 AM
Silver Member
Join Date: Feb 2002
Location: Mississippi Delta
Posts: 161
Re: 300 Weatherby Load Help

IMR 7828 seems to work the best for me. It works well with just about every 180 gr. bullet I've ever tried. I've also had pretty good luck with RL22.
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Unread 02-20-2006, 09:36 AM
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Join Date: Dec 2001
Location: Long Island, New York
Posts: 2,499
Re: 300 Weatherby Load Help

I have owned several older Mark V rifles and have struggled to maintain accuracy in all of them. The foward bedding points and wood stocks are a big issue. At least they were in my rifles. Since you are shooting a factory barrel I have two bits of information that might help.

I had a well known gunsmith re-bed my Mark V action and float the factory barrel. The gun shot worse. No load combinations would return the accuracy. I eventually sent the rifle back to Weatherby and they insisted on restocking the rifle. They claimed that hogging out wood and floating barrels was inconsistent with attaining accuracy in their rifles.

The rifle was returned with a new stock and new pressure pads near the foreend. It shot MUCH better for a year or two. Eventually the same accuracy problem returned and I got rid of the rifle. Wood stocks warp, move or whatever over time.

Weatherby also advised that 95% of the rifles that are returned to the factory for accuracy problems had badly fouled bores and that they only needed a substancial cleaning. Most of the shooters who owned those rifles claimed to have been cleaning the bores regularely, according to Weatherby. IMO before you do any more testing I would strip that bore throughly with Foul Out (or similar) and them follow up with JB Bore Paste. Testing for a complete removal of copper fouling by leaving Barnes CR-10 in the bore for 5-10 minutes is a good idea too.
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Unread 02-21-2006, 12:35 AM
Silver Member
Join Date: Jan 2005
Location: Wyoming
Posts: 215
Re: 300 Weatherby Load Help

Thank's everyone for the information. It was exactly what I was looking for. It looks like I should give IMR7828 and RL22 a try (Does anyone know how well these powders perform in the 338 Lapua, my next project?).

Here is some more background on the rifle:

I bought the rifle when I was in college. It originally shot 2-3" groups. I left it with my dad to work up some loads for me (before I was equipped to reload myself). He couldn't get it to shoot any better, so as a surprise for me, he had it bedded and free-floated. So there went the factory 1.5" guarantee, at least without replacing the stock. The action and the first inch of the barrel were bedded. This did not help, nor hurt, the rifles accuracy. At one point I backed out the front action screw, inserted some folded business cards between the stock and the barrel, and shot groups while tightening the front action screw. Doing this I was able to get a 3/4" group, but didn't like the upwards pressure on the barrel.

Since then, on this last ditch effort to get it to shoot, I have done the following:

Purchased some Weatherby brand brass instead of the Remington brass. Prepped the brass by trimming all the cases to the same length, uniforming the primer pockets, deburring/uniforming the flash holes. Opened up the barrel channel more since the original 'free float' job was poorly done, having left some high spots that may have contacted the barrel during recoil. Tightened the action screws with less torque than before. Thouroughly cleaned the barrel and the chamber with Kroil, various powder and copper solvents, and JB's Bore Paste. Purchased some heavier bullets, since all previous loading and shooting was done with bullets ranging from 150 gr. to 168 gr.

This last weekend I worked up and shot some loads with the RL19 that I already had on hand and some 180 gr. SPBT SGK's. I tried several loads from 72.5 grains to 78.5 grains (all well below the max listed charge weight). Well Guess what!! ALL the groups were below 1.3"!! Most notable were 0.624" with 77 gr., 0.806" with 76.5 gr., and 0.907" with 78.0 gr.
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Unread 02-23-2006, 10:01 PM
Junior Member
Join Date: Apr 2005
Posts: 19
Re: 300 Weatherby Load Help

Fishry, just want to confirm that your final groups with your 300 Weatherby was with a free floated barrel. Good groups. I am thinking of re-bedding and free floating my 300 Weatherby.
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Unread 02-24-2006, 09:43 AM
Platinum Member
Join Date: Apr 2003
Location: North Bend, Oregon
Posts: 1,524
Re: 300 Weatherby Load Help

As far as the freebore goes. Forget about it. I have shot many groups from all 4 of my Weatherby's right under 1/2 of an inch. Only the aluminum bed blocked ones need the 65 inch pounds of torque. The wood stocked and regular synthetics only torque up to 40-45 inch pounds. If you are using windage adjustable rings make sure the windage screws are torqued up to 40-45 inch pounds or your groups may wander on a 300Wby.

Which Mark 5 are you using? Use only in Weatherby brass, for Remington brass back off 3 grains. My sweet spot load is 88.5 grains of IMR-7828 behind a 180 grain Nosler Partition. It usually shoots 1/2 MOA and goes 3300 fps. I seat them at 3.60". This load very closely duplicates the factory round in velocity and the very slight extractor mark. At 88 grains I get no marks of any kind but haven't chronographed yet because my chronograph is at Pact at the moment. At 88 grains the groups opened up just a bit. 180 grain Barnes Triple Shocks shoot well too with the same load. I know the pressures are not too bad as I only neck size with Lee Collet dies and the pockets are still tight and the bolt handle goes down easy after 5 firings on the same brass.

I pretty much avoid working up loads in my hunting rifles with bullets that are not suitable for hunting with. If you varmint hunt with it like I do, then I would try anything for less than deer sized animals. The target bullets and the Sierra Game Kings are a little fragile for the 300Wby on big game.
NRA Life Member and I vote.

Only accurate rifles are interesting.

Gordy and Brady.
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Unread 02-24-2006, 02:32 PM
Platinum Member
Join Date: Dec 2005
Posts: 2,483
Re: 300 Weatherby Load Help

Years ago, I used to shoot rifle matches with the guy who worked for Roy Weatherby and designed their first set of rifle stocks. He was much liked by Roy Weatherby and so he was able to get two Mark V actions made without the magazine cutout; solid bottom very stiff actions to make target rifles out of.

My friend tried to get Roy Weatherby to use shorter throats/freebore/leade (whatever you wanna call it) but Roy said no, he wants to be able to burn as much powder as possible 'cause one can get higher muzzle velocity that way and at the close ranges most people hunt at muzzle velocity is more important than accuracy.

Anyway, he said that Weatherby rifles like others, need to have thier barrel completely free floated; no bedding pad under it at all. And seating bullets out far enough to touch the lands usually produces best accuracy. However, some folks have shot some 6 to 7 inch many-shot groups at 1000 yards with Sierra 30 caliber 200-gr. match bullets jumping 1/4th inch before engaging the rifling.

And be sure the cases are sized all the way back to the belt with a full-length sizing die else the step in front of the belt may cause headspacing problems.

And hard-kickin' rifles like a Mark V .300 Wby. Mag. will probably shoot more accurate for folks if they are slung up in a traditional prone position with a sand bag under the fore end. Shooting such kickers off a bench in the traditional "hold it tight with both hands and squeeze off the round as best you can" method isn't very repeatable as recoil increases. Just be sure there's enough eye relief on the scope before you touch your's off prone or you'll be able to wear the "Weatherby" patch. That's a patch some white hunters in Africa have sometimes given clients when their scope nails them just above the eye brow; it's white with cross hairs with red blood drops on it.
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