I have a 6.5 x .250 savage wildcat with the custom dies that I need reloading data for. Anybody out there who can help?
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March 12, 2010, 02:51 PM
That would the same cartridge as the .260 Bobcat that was introduced several years ago. I remember Jim Carmichael was shooting one at 1000 yards and getting some really small groups. He wrote an article about it when he was editor Outdoor Life magazine and as I remember his best loads were with IMR4895 and Sierra Match King bullets.
March 12, 2010, 02:58 PM
WARNING: The below is only for advanced reloaders or wildcatters
what is the case capacity compared to 6.5 creedmore, 6.5x51jap, 6.5x52carcano?
If greater than one or more of these three then the cartridges smaller than your case capacity can be used as a guideline or at least a starting point for working up a load
250 savage data could be used for bullets of the SAME WEIGHT. Because the case is the same and your bullet is slightly larger in diameter pressures will be less, again for the same weight bullet.
.257 vs .264 is only .007" diffrence
March 12, 2010, 04:39 PM
Tell us more about the rifle. What kind of action, make, model?
March 12, 2010, 07:14 PM
The .250 Savage necked to 6.5mm is also known as the 6.5x.250 Bush. There is an improved version of this as well. I have not found any loads for this wildcat yet. As krochus alluded to, using 250 Savage data as a base line should be safe as you work up from the starting loads listed with comparable bullet weights.
You do need to be savvy enough to recognize limits, as powder charges and pressures increase during load work up.
I'm sure it is a great round, but I would consider a rechamber to another standardized cartridge such as the 6.5x55 Swede, or the 260 Rem, if the rifle being used is capable.
March 12, 2010, 08:09 PM
You might try going to a library and look at old issues of Outdoor Life. I can also remember reading about the 260 Bobcat in Outdoor Life. Seems like around 15 years ago now. Around 1993 - 1996. It was just before the 260 Remington came out in 1997. I also seem to remember IMR 4895 as the powder for it.
March 12, 2010, 10:14 PM
Thanks for the replies. It is a Jap bringback that was wildcatted in W. Ne. late 40s or early 50s, mannlicher stock with really nice wood. Whoever built it did a nice job. Trigger work, lyman peeps etc. also have the custom dies for it. I traded a market hog for it in the early 80's and it has been hanging around since. Figured I needed to get it to the range this spring and our snow is going fast so it is time to reload.
March 12, 2010, 10:42 PM
Are you SURE it's chambered for 6.5mm250 and not 6.5-257 Roberts which was the most popular arisaka rechamber
March 13, 2010, 08:58 AM
MFA, you can be pretty certain that Krochus is correct about your old jap rifle being chambered for the 6.5/257. The 6.5 Jap case is longer than the .250 Savage. Therefore in order to rechamber for the .250 it would have been necessary to set the barrel back, which would make the job much more complex and make no sense. Rechambering to .257 was quick and easy and very common. A quick and easy check would be to try chambering a .257 cartridge or empty case. If the bolt closes you can be sure the chamber isn't .257 Roberts. This will not necessairly mean that rifle is chambered for .257, but anyway you'll know what it isn't. By all means don't attempt to fire the .257 until you have a more positive ident of the chambering. To be extra cautious if checking chamber with live ammo, remove firing pin. Easily done.
March 14, 2010, 03:19 AM
Yes i am reasonibly certain, Dies are clearly marked, brass with it are all .250 savage. I will see expert assisitance to absolutely verify.
Better safe than sorry!
March 14, 2010, 11:31 AM
One way to make a positive ID is to make up a couple bulletless fireform loads in 22-250 pr 250 sav brass and shoot em. This will give you a resonably safe and accurate imprint of the chamber.
I've actually done this myself on an arisaka aporter.
March 15, 2010, 09:55 AM
Your rifle was built for the 6.5x50 Arisaka, a CIP 38,000 cup / 43,000 psi cartridge. That’s low. Real low, and I’m sure for good reason. I would advise taking it easy with this one. Follow proper reloading practices, work up loads slowly, look for pressure signs, and back off the moment they appear.
Plugging the 6.5-250 into my modified Powley Computer it shows with 140 grain bullets you ideal powder speed is in the range of RL-17 and H414. Using either of those powders, a 140 grain bullet, and a COAL of 2.520", 27 grains would be a mild starting load. Velocity from a 24" barrel is estimated to be about 2,100 fps.
With a 120 grain bullet the ideal powder speed tilts to faster powders in the range of Varget and N540. Using either of those powders, a 120 grain bullet, and a COAL of 2.520", 29 grains would be a mild starting load. Velocity from a 24" barrel is estimated to be about 2,300 fps.
Before you load the first cartridge, if I were you, I’d get some Cerrosafe and do a chamber cast. This would eliminate any questions about chamber dimensions and condition, freebore length, and what is the proper donor brass to use. You could easily do this yourself. Where to get it: