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340 Weatherby Loading Trouble w/ 225g TSX &TTSX

340 Weatherby Loading Trouble w/ 225g TSX &TTSX
« on: August 07, 2017, 05:56:17 PM »
Hey guys,

Would sure appreciate some help here! I live up in Alberta, Canada.  Last year, I bought a RC Accumark in 340 Wby. Range Certified target had a cluster of 3 shots overlapping each other using the 225g TSX and IMR 7828. I've tried multiple combinations (3 shot groups) from 88.5 to 92g in 0.5g increments with the only common result being 2 shots touching and the 3rd 1.0" to 1.25" away(several targets). A couple groups were 0.6" - 0.7" clusters, but not the 3 shot touching like the Range Certified target.

I've been reloading and shooting for many years with much success, so I'm confident in my reloading practices and my shooting techniques.

Another question: how much run from the lands should I give my bullet?

Any help is GREATLY appreciated.

-PDub

Blackbear3

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Re: 340 Weatherby Loading Trouble w/ 225g TSX &TTSX
« Reply #1 on: August 07, 2017, 06:27:30 PM »
Welcome to the Nation. You might want to post this in Around the Campfire, it will get more exposure there. The groups shot for the RC models are done with factory ammo I believe, you might try using the COL from them.
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Re: 340 Weatherby Loading Trouble w/ 225g TSX &TTSX
« Reply #2 on: August 07, 2017, 07:19:43 PM »
Thanks BlackBear3!

Stacy

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Re: 340 Weatherby Loading Trouble w/ 225g TSX &TTSX
« Reply #3 on: August 07, 2017, 10:44:07 PM »
Barnes recommends starting with the bullets .050 (50 thousandths) from the lands. If that doesn't work, somewhere between 30-70 thousandths from the lands will be a sweet spot.   

Not a 340 Weatherby but 2 Brownings (Abolt and Xbolt), Vanguard, Remington 700 XCR and McGowen barrel on another Remington 700 all chambered in 338 Win Mag shot their best 50 thousandths from the lands. If you can seat them that close as I assume your 340 has plenty of freebore?

http://www.barnesbullets.com/faq/

Do I seat TSX bullets .030 inch to .070 inch from the lands, starting at .050 inch off the lands, as recommended with other X-style bullets?

Yes. All-copper TSX Bullets typically give better accuracy when seated off the lands and grooves (the rifling in the barrel).
   

Re: 340 Weatherby Loading Trouble w/ 225g TSX &TTSX
« Reply #4 on: August 11, 2017, 02:02:02 PM »
Hey Stacey,

I haven't played much with the sating depth; I've only been seating to the mag length. I'll check and see how close I am to the lands, but don't think I can extend it by much. I measured it before I started loading, but can't recall right now.

Thx,

-PW

Re: 340 Weatherby Loading Trouble w/ 225g TSX &TTSX
« Reply #5 on: August 14, 2017, 12:04:50 PM »
The biggest problem you will run into in trying to seat the bullets closer to the rifling leades is the freebore built into the rifle.  It is usually about .371.  This would leave the COL so long that you will render your rifle a single shot.  I have done that on my rifle because it is just used for target shooting.  I am still working on the load using the 250 SMK, I seem to getting promising results from 7828ssc, Re19 and Re22.  Good Luck