Is their any wildcat in .243 that will push a 100-110gr bullet to 4000fps?

JASON

.243 - 6mm Bullet size, not 243 win case. No cookies - No edit.

JASON

Jason,

I have a 6mm/06 AI thats pushing 105's @ 3400fps in a 30" tube.. There really isnt a need to go faster 3400fps will tearup a bbl in about 1500 shots or so.. 100's @ 4000fps you will need a bbl in like 500-800 shots... Im not sure what wildcat will push a 6mm 100gr bullet @ 4000fps but guess you could go make a 6mm/300 Weatherby Mag and give it a go... I have a 6.5/300 Weatherby Mag and im pushing 139's @ 3400-3500fps in a 30" tube... On the other hand you may have problems holding a 243 bullet together @ 4000fps cant say never tried lol.. But i did have those 6.5 139's come apart on me @ 100yds because i was pushing them way to fast...

6.5 Bandit

6.5 Bandit,
The bullet I am looking at is a sierra 107gr hpbt, with a BC of .527 and a SD OF .259. I also wondered about bullet failure. The 300 weatherby necked down with 30 or 40 degree shoulder sounds interesting. I have been looking at the lighter bullets 100-110 because they are easier to acheive higher velocity and will provide less recoil. Two problems I see are Bullet construction / BC and barrel wear. Does anyone know of any books or sources on study's or info on barrel wear, bullet design, and wildcats? How about a barrel that is just chromed lined in the chamber and the throat area and some kind of hard material for a bullet that has a BC of close to one with a slight copper or soft metal cover. Seems like there has to be some way.

JASON

My .240 Incinerator comes close with 95 grain slugs (.264 Mag necked to 6mm; very similar to the Mach VI). With a 28.5" barrel, I can get 3,930 using 82.5 grains of WC860 (I went with a slow twist though in order to shoot lighter bullets...the best speed I've got from the rifle thus far is 4,440 fps with a 70 grain Ballistic Tip).

Lee Martin
www.singleactions.com

Jason,

I would use 40� shoulder.. I would also use a 30" tube with a 8 twist.. Barrel life is goin to be short there is no way around it that I know of.. But the biggest thing will the bullet not fail at those speeds.. If your using either the 105 amax bc .500 or the sierra 107 bc .527 you prolly have the best chance... But there is only one way to find out and thats give it a shot.. Unless someone else has tried it before and then they could tell ya if it worked or not... Good Luck..

6.5 Bandit

I wrote sierra to see if the 107 would hold up at 4000 fps. I did some more looking at cases and see the cheaper 8mm rem mag is identical to the 300 weatherby which would be alot cheaper on brass. I wonder how much more trouble it would be to neck down a 8mm over the 30. I checked the recoil and twist on load from a disk and it said a 9 twist and the recoil would be a little more then half of what my 300 shooting 220gr is. I don't want this rifle to long so I am thinking either a 26" or 27" barrel. It will be awhile before I burn out my barrel on my 300 so that gives me plenty of time to plan.

Jason

Jason,

You can also use 7STW brass as well.. I tried using the 8mm brass for my 6.5 and didnt like the way it performed... Hornady and Sierra both recomend a 7-8" twist if i rember correctly.. But you should be able to get away with a 9.. I have a Ruger in 243 with a 9 twist and it shoots both the 105's and 7's excellent.. Im thinking you may need to get a 30" tube so you can burn enough powder to reach 4000fps.. But then again if you use the 300 winny case you just might get away with a 27" tube.. Hard to say.. Like I said ealier I have them both goin 3400 on a 06 case with a 30" tube.. Good luck and keep us posted...

6.5 Bandit

You'll need to try all remedies to prevent your bullets from going apart.
Have a look at Borders '5R' Obermeyer rifling set-up at Borderbarrels.com it will take you a long way in getting your bullets whole through that barrel.
Also I would suggest you look at Daniel Liljas site. Lilja barrels produce barrels that will stand up to heat erosion of the throat better than most; their 3 grooves barrels in stainless.
Just imagine if one could get '5R' rifling in a 3 groove barrel ... that would really be something ... (why not ask Border and Lilja about this?).

Yours

Forgot in my last reply.
The '5R' barrels will work best with bullets 1.5 x caliber, but then I guess your 100 grains + bullets has a "bearing-surface" larger than 1.5 x cal.

240 hawk, fastest 240 i can think of, 28in barrel
59, WMR 100, Hornady 3,867
59, M3100 100, Sierra 3,935 (excessive!)
59, Big Boy 105, Speer 3,662

Jason,
Another avenue you might try are .30 cal sabots sold by EA Brown. http://www.eabco.com

The problem you have is the 105gr bullet in 6mm is heavy for caliber. (Although not heavy in weight when compared to a typical .30 caliber bullet) Thus, it is hard to push fast in a 6mm barrel.

By using sabots you can fire .22 cal (And 6mm if you want to ream out the sabot) in a .30 cal rifle such as a 300 Win mag. You should be able to approach the velocities you want and do it in a regular non-custom rifle. Also, as an added bonus you get increased barrel life and can still shoot regular 300 mag ammo. (Which is a much more practical caliber)

[ 09-17-2003, 21:57: Message edited by: J.W. Blute ]

Aaiieee.....

Anyone here actually used these sabots? Do they shoot worth a darn? I'm just thinking it'd be kinda cool, just for the WTF? looks as much as anything, to shoot some .224 cal bullets from my .308 Win Match rifle at a HighPower shoot sometime...

Monte

I used them to push .22 cal 55gr balistic tips out of my .300 mag! They were traveling some ware near light speed but would only group around 2.5 inches at 100 yards.

I only tried this with one load and only with one rifle. (Rem 700 Police 300 mag) Thus, your mileage may vary.

I still have a bunch of them left…….. I just haven’t gotten around to trying another batch. (That reminds me….. I have a Rem 40X in .308 that I might try.)

[ 09-17-2003, 23:00: Message edited by: J.W. Blute ]

[ 09-17-2003, 22:59: Message edited by: J.W. Blute ]