The load I use is Fed 215 primers, 88.0 R22 pushing a 225 Swift A-Frame. Sounds like I will start with a 250 gr bullet, probably an Accubond. He took his bull at 453 yards with the first shot. It after that would consistantly keep them all in .5 to .75 moa to 400 yards. It is based on the .300 Weatherby case necked up to accept .338" bullets. Gunpowder Charge Weight Velocity m/s Velocity fps; Norma 204: Max 86.5 Min 82.0: 1022 954: 3353 3130 ... Weatherby N340250PT Select Plus 340 Wthby Mag 250 Gr Nosler Partition (NP) 20 B $115.99 $5.80/Round Wby Ammo .30-378 Weatherby Mag 180gr. [2]Performance. The .340 Weatherby was introduced to compete with the .338 Winchester Magnum which had a hold on the market at the time. Gun Parts - Stocks, Barrels, Actions, etc. Like the.338 Lapua, it is a great candidate for the 300 grain long-range bullets now on the market. I have seen a 340 Weatherby take down Elk hard with a 250 gr Nosler Partition many times, try IMR 7828 and 250 sierra mk i have a 30 inch hart 7/8 muzzle .shoots very well over 3100 FPS.its hard on primer pockets but 90gr.works good.start around 85gr and see what yours like.....george. Extremely accurate out of my 340. But, the .340 Weatherby is better than the .338 Winchester. 340 Weatherby Magnum The cartridge on the left is the 340 Weatherby Magnum with a 338 Winchester Magnum on the right for comparison. Mag. You can go to 250 grains (Hawk bullets) with it if you load or buy custom loads. The ballistic performances based off three grain ty… Currently A-square is the only other factory ammunition producer of the .340 Weatherby Magnum which has led to limited popularity of the caliber. Stainless barrel, bell and carlson stock that ive bedded, yada yada but I would definitely have to agree with the 250 accubonds. ~ 1/2 MOA @ 1oo yd. Bulk Ammunition on sale, including 340 Weatherby Mag Rifle Rounds. Mine seems to like 250 Sierra Game Kings with a healthy dose of IMR7828 and a FED215 around 2970FPS. In fact when the Phs in AF asked what I was shooting I replied a 340. Having said this, on lean game, rear lung shots can produce delayed killing at impact velocities below 2400fps. Introduced in 1963, the 340 Weatherby was designed as a response to the 338 Winchester Mag. I've never compared it to the .340 Weatherby. The ballistic coefficient is very close and the price is very close. will kill anything that should be hunted with a .338 rifle, what you are buying in the .340 is a somewhat flatter trajectory. When I purchased my fist 340 Mark V I was struggling badly with loads. diameter bullets as the .338 Winchester Magnum but it does so at greater velocity than its Winchester competition. Antecedentes. So I aquired an almost new Mark V 340 WBY Mag a while back and just finally got a scope for it and will now start playing with some loads for it. Sent from my iPhone. I dont know whether to try a 225 or 250 grain bullet and also am undecided on which bullet to start with. Was: $48.95. The 225 TTSX's were pretty accurate as well with RL22. I have installed a Vias muzzle brake on my 340 as well, and having shot it without it and then with, it makes a huge difference. This is the kind of stuff I was looking for..... First hand experience. Tomas Nybrand 4,256 views. It is on the light side at 91/2 #s with scope [1 3/4 to 6 Leupold] It is a great cat rifle[ caliber/cartridge] with a 225 Nosler at almost 3100 FPS. The parent case is a .300 H&H Magnum expanded to fit a .338 bullet. I just want the ability to shoot out further if I need to and still have the bullet perform well at closer range. And, it shoots heavier 338 bullets at higher velocities as well – a decidedly powerful combination. Due to recent events it could be possible they are delayed, closed or not accepting transfers. Weatherby offers six different bullets in the .340, but the best ones are the 225gn Barnes TSX at 2970fps and the 250gn Nosler Partition at 2941fps. 340 Weatherby Magnum vs water bottle - Duration: 1:32. Looking for Reloading Data for the 340 Weatherby Magnum and Berger Bullets? Find 340 Weatherby Mag Ammo for sale, in-stock and ready to ship at Ammo Freedom. However, Roy took advantage of the longer case to pack in more powder for greater velocity. Since the .338 Win. Adam Weatherby's First Harvest with 6.5-300 Cartridge: Proving Grounds - Duration: 11:13. THE 340 WEATHERBY An Excellent Big Game Cartridge After hunting with a 340 Weatherby that belongs to a friend of mine and who was gracious enough to let me use it almost 20 years ago, on a mule deer hunt in Colorado, I was hooked. 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