I’ve had experience reloading for 2 of these rifles, the 270 W was straightforward. I worked up a sub MOA hunting load on the 1st try after some research on the correct component combination. Went with the 130 TTSX & Reloder 23 and the Federal 215m primer. It’s a laser beam & kills everything we put the crosshairs on.

The ULW 300 W is the exact opposite, it has to be the most difficult rifle I’ve ever come across. I’ve lost track of the loads I’ve tried in it. It patterns more than groups.

I’ve tried all the usual tricks on it to no avail, it must have something to do with that long whippy barrel & barrel harmonics. Found a Hunting Shack factory load that shoots OK it’s using the Speer 180 grain Grand Slam, that’s a bullet which I like so l stocked up and am using that. Still bugs me I couldn’t get a reload I liked to work.

I wondered how those would shoot. You don't see many ultra light rifles with that stock design. When I first got in to lightweight rifles I spent a good bit of time talking to (more like bothering) Melvin Forbes, and a straight stock with no drop was one item he felt necessary, especially as recoil (and as a result muzzle flip) increases. His advice when I first started loading for light weight rifles was to sight in with my off hand on top of the scope and not to be afraid to apply some downward pressure. Maybe its just the difference in muzzle jump with the magnum.

Only have experience with one in 257 and it was very accurate. I would send the 300 back to Weatherby, if the customer service is as good as it used to be they will probably re-barrel it. Sometimes this doesn't pan out as they may test it in a machine rest which could eliminate bedding or other issues causing the poor accuracy.

Hadn’t thought of that option

From another forum...


“The 300 Bee in the ultralightweight config is a true bear to get to shoot nicely. Way too much whip for such a light barrel. I personally have NEVER seen an accurate one”

I'd contact Weatherby 1st. then I would full length bed the whole thing. I might to that even if they did put a new tube on it. Always sand out the channel and re-float it if you wanted.

Between myself and a friend, we have owned several of these but none where 300 WM. All responded very well to Devcon 10110 bedding and Timney trigger. Best of the bunch was a 338-06 that would one hole the 180 BT's but all where great shooters. Remove from the stock and check the contact points. Those are really nice stocks, but factory contact is very spotty.

I have a 338-06 that is a 1 1/4"+ 5-shot rifle after I bedded the action and reworked the pressure point. Before the work the rifle was a 2 1/2" 5-shot rifle and free floated it was a 2" 5-shot rifle. This rifle likes the pressure point but the one from the factory was poorly done.

A second one belonging to my son is a 30-06 and it behaved almost exactly like the 338-06 did. I when thru the same process and it will now shot around 1" 5-shot groups, again with a proper pressure point.

Groups quoted above are with factory loads that each individual rifle liked.

I have never had anyone not have some sort of accuracy issues with an ultralight in 300 win or WBY.

I had an UL in .30-06. Loved the feel, the weight, the point-ability.

But she didn’t shoot for shìt.

I did everything, powders primers bullets, even a bedding job. Fine for 200 yard hunting accuracy but by no means farther. I sold it and went Tikka, never to look back.



P

84.5 gr IMR 7828 stacks 180’s all day in my 300 Wby & 83.5 gr of the same in the other.

Had a Weatherby Ultra Lightweight in 300 WBY. Shot an amazing 3 shot group and thought I had found the perfect solution for a sheep rifle until it almost cost me a nice ram in the Brooks Range. Upon my return I found that the rifle would always throw one flyer in every group. Careful analysis revealed that the flyer was utterly random. Could be any shot in the group. Sent it to Weatherby and they returned it saying nothing wrong. Got a Weatherby employee in engineering interested. Returned rifle to him and he sent me a new rifle. Would not tell me why but I suspect a hairline crack in the receiver. Subsequently found that others experienced the same results in 300 WBY. My conclusion is that a 180 grain bullet at 3100 fps is too much of a good thing in a 5 1/2 pound rifle. Sold it new in box to my sheep guide and replaced it with a Win model 70 300 WSM in a 1 pound MPI stock. 100 fps slower and a 1/2 pound heavier but totally reliable.

I bought an ultra light Weatherby 300 win mag a while back and had troubles. It turns out it had little to do with the rifle.

The trigger came badly adjusted. Creepy and 4 pounds. Got it to just under 3 and crisp with out the stones.

Factory Weatherby pressure bedded fore end didn’t like the hard sand filled rest. Thick glove took care of that. Started showing some potential so I went ahead and glass bedded the action and 2” of the barrel and free floated it because of poi changes. Turns out that the pressure bedded fore stock was not the problem with the poi shift,,,,,,,

Leupold windage rings and bases wouldn’t hold the 16oz scope. The rear windage rings started to shear the windage screws. I put on a Warne steel rail and 3 weaver detachable rings. That took care of that problem .( poi shift) The thing kicks hard.

Once that was sorted, sub moa groups are the norm. Later I extended the bolt stop track and took out the magazine spacer that limits oal length. I can load cartridges up to 3.750 now in the magazine. Vlds will get to the lands with plenty of room to spare.

It’s become my favourite hunting rifle. Very accurate and light weight. Definitely worth the trouble.

Had the same rifle (see avatar)and had no problems like you described - the interesting thing about this rife (actually the load I used) was it shot the same at 300 yards as it did at 100 yards (1.5” three shot groups) was consist at it. Took a nice Dall Sheep in the Alaskan range with it and a nice bull moose on the same hunt - shooting 180 grain Accubonds at 3180 fps. My nephew now has the rifle but it was a joy to carry on those type of hunts.

PennDog

I gave mine in 300 Wby away.

My Mk V LW .30-06 is very finicky but shoots some loads very well. My other Mk Vs in 7mm and .300 Roy are excellent shooters but dang sure aren’t lightweights. Who the heck wants a 7 lb rifle in .300 Weatherby? Glutton for punishment?

I set a LW in .240 up for a friend. He bought it used from a pawn shop in NW CO but looked practically new.

After getting a load developed from Superior Ammo, the rifle is a drill. It shot factory ammo pretty good, notably the WBY SP, around 1" but the Superior NAB load is under 1/2".


He has a 30-06 and a 25-06 as well in the LW setup. All are pretty good shooters but the .240 is my favorite. I will get one eventually.

Our .243 Win UL is a tack-driver. Literally. Everything we've used.

Only fly is POI shifts with load changes are pretty drastic. So long as we stick with a particular load it delivers every time.

About 99% of the problems with the UL Weatherbys in 300 Bee is with the Indian not the arrow.

Cheers to that!

Had an ULW in .240 for a while--which my wife mostly used, after she found out how well the stock fit her. It shot very well too.

But part of the deal is that smaller-caliber cartridges result in stiffer barrels.

I believe you can apply the laws of cantilevers to determine how much stiffer the barrel is in a 243 compared to a 308.

On a muzzle diameter of .600”. The 243 has about 10% more steel across the diameter. Stiffness increased at a rate of 4:1 ( it’s strange John, that ratio comes up so often!).

We can conclude the 243 is about 40% stiffer given the same barrel contour.

I had an ULW in .300 Wby. After some work by Hill Country Rifles it shot about 1.0 MOA with 180 grain Partitions, 3-shot groups.

One problem is the barrel really heats up fast. After three shots, I stuck a hose from a battery powered air mattress up the barrel and ran air through it for 10 minutes before shooting more.

Another problem was recoil. The perceived kick was much greater than my .375 H&H Model 70. that's bound to affect "accuracy."

This ULW Mark V might be my winter project, pray for me.

41

Float the barrel from 2” in front of the recoil lug and work up a load. It will shoot. They put a good barrel on the ultralight.

On paper the mkv ultra lightweight seemed like the ultimate rifle for me for several years. The problem was the ones in on weatherby cartridges seemed notoriously in accurate and and I didn’t want a smaller rifle. I got one in 300wby, between the whip on that 28” barrel, the recoil and the clunky bell and Carlson stock I didn’t keep it long.

It wasn’t fun to shoot, it wasn’t accurate and it was not easy to carry in thick brush.

I’ve had experience with 2 of them in 300 Weatherby. Neither one shot well. With some loads I could get 3 to group ok, but then both would climb right up off the target.

I shot my 2nd Grizzly with one of them. Sold it after that. Went to a M-70 SS Classic in 338 WM. I’ve never looked back.

I have one in a 300wm with a 24” tube. Shoots excellent after bedding the rifle and free floating the barrel.

It came with a pressure point and as with almost all rifles bedded that way, poi shifts occurred when you were slung up.

Negligible poi shifts with it free floated and shoots accurately. I believe the 300 Weatherby only came with a 26” tube as well.

My 300 Wby UL stacks 'em on paper & on the back of the truck. My 280 Wby UL does too.....but, it took me owning three to find one that'd shoot as it should. Could not be happier now.

I’ve had 3, 257, 240, and a 300 Wby, all with talleys, all leupolds, all shot under a inch with factory fodder. Pards 270 Wby shoots very well too, it’s his only rifle. Just took it to Wyoming with me last month after a 7 year hiatus….





Only gets fed 130 Hornadys. Bullets mean far more than headstamps!!! 😂😂

My Weatherby ULW 338-06 throws darts with the 200gr Speer, 210gr NPT. I think I’m mostly surprised that it shoots 4320, RL15 & IMR 4064 almost equally well with these bullets. I’d love to find another one in 280.

Boy I’d love to have that rifle!!

i purchased a 338 Lapua Weatherby Accumark Mark 5 new this rifle shot horrible even with a good Night force scope on it, i called Weatherby they were no help at all wanted me to send rifle and a check for around $150.00 for them to check and decide how this rifle shot within their specs 3 shot 100 yd. groups so i told them to forget it. so i had a new Brux barrel chambered in a 338 Lapua with a new end port on barrel also ,this rifle now shoots 1/2 inch - 5 shot groups at 100 yards off my cement bench and is a joy to shoot now. i am not at all impressed with Weatherby`s customer service , i also have a 257 Weatherby mag. Accumark and this rifle is impressive how it shoots too with some things redone on stock and trigger.

Uuuuummmmm the 338 lapua isn’t a ulw, but cool story anyhow

I had just the opposite experience with WBY customer service. Bought a new ultralight in 300wby. Shot very well using my reloads of 7828 and a Nosler BT @3150fps. I was able to go to 3200+ with max book charge.
Anyways trigger had some creep and since it was a new trigger I sent it in. Stock came back with pin holes that hadn't been filled. I had not noticed these before and called C.S. They paid for a return. I asked if they could put a different stock I believe the outfitter, I liked the color scheme better. And asked if they would range certify after. They did all of it for me. Groups were with a 180gr TTSX load at .52 and .73.
I havent shot the rifle since getting it back. Hopefully is shoots as well for me as it did in their shop
Jeff

Few questions. I'm assuming they fixed the trigger for free. But how much was it for that new stock and for doing the range certification? And did they use Factory ammo to range certify?

They did not charge anything. This was about 2016-17 time frame. They said since the stock had a defect and needed replaced anyways no big deal
Jeff

P.M. me

Mine is accurate enough.
George

yep your right its just a Accumark that is suppose to be accurate and it was a expensive new rifle that shot horrible and still pisses me off yet with Weatherby`s customer service department. sure it now shoots better than any factory Weatherby accumark 338 Lapua but it cost me another $ 500.00 to put a Brux barrel on this rifle which is a much better barrel and the machinist " Greg " does do a lot of bench rest rifles that have won some titles. but the point is for that kind of money that factory Weatherby rifle should have shot much better 1 - 1/2 inch 3 shot groups at 100 yards is terrible , now i can shoot 5 shot groups at 100 yards 1/2 inch once i replaced the barrel , that new factory rifle should have with a factory barrel should have shot 3 shot 3/4 inch at 100 yards at least. maybe i am to fussy but Savages do it with a cheap rifle , so does Ruger and Remington they all shoot groups under an inch. >> shame on Weatherby if Roy was alive this would not have happened !