243 115gr DTAC

[albertaguide]

i was on 6mmBR.com and saw a posting regarding a load firing a 115gr DTAC @ 3150fps, no mention of barrel length or load data. i was wondering how this is possible or if i'd be able to come close with my  factory vangaurd. the highest velocity i've found in a reloading manual is 3000fps with a 105 hornady Amax

[gary0529]

Before you get into sheer speed, will a 1:10 twist barrel even stabilize a 115 DTAC.
I really doubt it.
I get marginal stability numbers when I calculate it using Brian Lizt's formula in a 10 twist.
Since I shoot 6mm BR I would likely bet that whoever posted there has a 1:8 or faster barrel.

Don't see how 3000 fps will do you any good if it ain't going straight.

However, saying that, remember that every barrel is different and I have no experience with Weatherby and the freebore it has.

Perhaps you can post the question on a Weatherby forum and get someone who has actually tried it.

Gary

[243dave]

Your vanguard won't stabilize the DTAC and even if it did you couldn't get that kind of velocity.  That bullet should be shot out of a 1-7.5 inch twist not a 1-10.  Those kind of velocties from a 243 is only achieved with a long barrel that is specially throated for the DTAC and loaded to a OAL of more than 2.8 inches.  You have to build a gun for that bullet.
Dave 

[albertaguide]

i hadn't considered a specially chambered rifle. i assumed a longer barrel. my vangaurd shoots 105 Amax great @ 3025fps, but my question had more to do with curiousity. not a speed addict but love accuracy (was it Elmer Kieth who said "only accurate rifles are interesting"?) i used to use a 75gr hp at 3100 fps exclusivly. my 243 is only a varmit gun. but my fiancee and son will be using it and or my 6.5 swed for deer next season.

[243dave]

I think Townsend Whelen said "only accurate rifles are interesting".   Are you intending to use the A-max for deer??
They might work well, I don't have no first hand knowledge, but I'd bet there are better bullets for the deer. 
Dave

[albertaguide]

No i use a 338win mag or 300 weatherby for deer, (Alberta muleys are huge!!! kidding but believe using "more than enough gun") i use the 243 for coyotes. typically 75gr HP but i get bored and either have to try new loads or trade the gun. i have used the Amax 105gr @ 2875fps for dogs with great success. if i hit em dead dog DRT!