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I bought an Interarms Mark X in 25-06. Couldn't get it to shoot with 115-120 grain bullets, as targets showed keyholing. Finally had the bright idea to check the twist rate: 1 in 14! (Yes, I've checked the rate multiple times).
The intended use was for deer hunting. Is there any chance I could salvage it for that purpose with shorter, flat based bullets? I can't seem to find info on how long various 87 grain bullets are, for example, so looking for any guidance here.
Thanks.
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I can walk on water.......................but I do stagger a bit on alcohol.
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Try the Speer 100 gr hot core. Worked very well in a 1-14 savage I had, at slower velocity than you'll be getting. Should work fine for your purposes.
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I had thought of the TTSX as well, but figured it was too long to stabilize.
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Try the Speer 100 gr hot core. Worked very well in a 1-14 savage I had, at slower velocity than you'll be getting. Should work fine for your purposes. Do you happen to know the length of the 100 gr hot core? Thanks.
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Campfire Kahuna
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The 80 TTSX isn't going to stabilize. The 100-grain Speer should (average length is about .94") as well as the 100-grain Hornady Interlock (.98").
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
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Thanks Mule Deer. I have been playing around with the Berger stability calculator, but didn't have the lengths of certain bullets. Should I keep those bullets under 2800 per the cup-n-core, rule-of-thumb?
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What about the 90 grain Sierra HPBT? Their .308 165 grain version of that is supposed to be pretty tough. If the .257 90 is as well it might make a terrific deer bullet.
Mathew 22: 37-39
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I'm guessing it's too long with the BT but can't find the length online.
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Campfire 'Bwana
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Have you considered the 87 grain Speer Hot Cor? There isn't a rule saying you have to propel it at full 25-06 power.
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Have you considered the 87 grain Speer Hot Cor? There isn't a rule saying you have to propel it at full 25-06 power. Agreed. Just want decent performance on deer under 300 yards. I do have some h4895 and could do a reduced load if it's suitable.
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Try those 87 g hot-cores, I bet they stabilize for you.
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gotsarock,
That's the Miller twist formula, generally considered the most reliable available--and what I've been playing with here to come up reasonable answers. It looks like any bullet under an inch long will stabilize to a certain extent, depending on conditions, and my guess is the 90-grain Sierra HPBT is under an inch, since the 100-grain MatchKing is about 1.09" long.
On a more material level, I've had the 100-grain Speer Hot-Cor stabilize fine even in cold weather at 2000 feet or so in eastern Montana, from the 1-14 twist of a .250 Savage (and the formula says it should, if marginally).
In my experience, one reason the 87 sometimes shoots well in 1-14 twists and the 100-grain doesn't the supposed 1-14 twists of older Savage 99's varied somewhat, because they were rifled on sine-bar machines. Some were apparently rifled on Mondays and Fridays, because I once owned an 99 .250 that turned out to have about a 1-15 twist. It would NOT shoot any 100-grain bullet, even the Speer, though it did fine with the 87. But all the other 1-14 twist .250's I've owned would shoot the 100 Speer and, often, the 100 Hornady Spire Point pretty well.
I've got enough of both of those 100-grain bullets to spare a little sampler pack if you want to try 'em.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
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Try them at full or close to velocity as well as reduced the higher velocity might stabilize them where the lower won't.
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Thanks for the detailed reply, Mule Deer. I don't understand why they put such a slow twist on this barrel, but I'm glad you and others have good suggestions on getting around the problem. I'll send you a PM on the sampler pack. Much appreciated. gotsarock,
That's the Miller twist formula, generally considered the most reliable available--and what I've been playing with here to come up reasonable answers. It looks like any bullet under an inch long will stabilize to a certain extent, depending on conditions, and my guess is the 90-grain Sierra HPBT is under an inch, since the 100-grain MatchKing is about 1.09" long.
On a more material level, I've had the 100-grain Speer Hot-Cor stabilize fine even in cold weather at 2000 feet or so in eastern Montana, from the 1-14 twist of a .250 Savage (and the formula says it should, if marginally).
In my experience, one reason the 87 sometimes shoots well in 1-14 twists and the 100-grain doesn't the supposed 1-14 twists of older Savage 99's varied somewhat, because they were rifled on sine-bar machines. Some were apparently rifled on Mondays and Fridays, because I once owned an 99 .250 that turned out to have about a 1-15 twist. It would NOT shoot any 100-grain bullet, even the Speer, though it did fine with the 87. But all the other 1-14 twist .250's I've owned would shoot the 100 Speer and, often, the 100 Hornady Spire Point pretty well.
I've got enough of both of those 100-grain bullets to spare a little sampler pack if you want to try 'em.
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Do you happen to know the length of the 100 gr hot core? Thanks. You got an answer already. For future use, most of the time Midway lists the bullet length, BC, and other info ... convenient place to look stuff up online. Tom
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Here be dragons ...
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I agree that Midway is useful in that respect. But they don't have lengths for many bullets, including some of the bullets under discussion, like the 100 grain Hot Cor. Do you happen to know the length of the 100 gr hot core? Thanks. You got an answer already. For future use, most of the time Midway lists the bullet length, BC, and other info ... convenient place to look stuff up online. Tom
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What about the 90 grain Sierra HPBT? Their .308 165 grain version of that is supposed to be pretty tough. If the .257 90 is as well it might make a terrific deer bullet. I used that bullet a lot in the .257 Weatherby and it stood up well to thee higher velocity.
When truth is ignored, it does not change an untruth from remaining a lie.
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Campfire 'Bwana
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My deer bullet in the 257 Ack is the Nosler 100 gr Partition, and my 25-06 is the Nosler 100 gr BT and the 110 gr Accubond, my 25 STW is the Barnes 100 ge TXS
A Doe walks out of the woods today and says, that is the last time I'm going to do that for Two Bucks.
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You could always go for the 84 grain flat nose Remington makes for the >25-20.
I'll bet that would stabilize in your 14 twist .25-06. Might want to back off a bit from top end though.
Mathew 22: 37-39
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