Or just gain a pile of weight....
Barrel Torque
- Thread starter peterdobson
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if they are smart, they foul long before needing to make that shot.
Sure. Fouling may have been the wrong term. Cold bore. How about that?
Pretty rifles, but kind of off topic. - dan
Yeah, but it’s the internet, and some rando mentioned, “special sauce.”
CB only
yup. The old term was CCB. foul just after cleaning and its CB only. Lesser effect on the first shot when it's CB vs CCB.
Jonnyofalltrades
Regular
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- North-central Saskatchewan
I'm not insinuating that Mike Rescigno is a liar or dishonest or anything like that.
But when I see groups that beat ALL the current benchrest world records, of ALL classes with no witnesses or moving backer, I become very skeptical. I can't help it, sorry.
I also realize that buttress threads tighten up very differently than "normal" 60° threads, much less radial thrust, much more axial thrust.
Very nice rifles, Tokay!
But when I see groups that beat ALL the current benchrest world records, of ALL classes with no witnesses or moving backer, I become very skeptical. I can't help it, sorry.
I also realize that buttress threads tighten up very differently than "normal" 60° threads, much less radial thrust, much more axial thrust.
Very nice rifles, Tokay!
I'd like to know what kind of barrel clamp is used to hold 500 ft-lbs of torque with only friction. Our actions use 16tpi, and we install at 100 ft-lbs. Our thread diameter on the Coyote and Timberwolf is .1" larger than a Remington, and more threads engaging. If I had a Remington action here, I'd machine up a plug with a hex, to get around the friction issues of holding a barrel, and put an honest 500 ft-lbs on it with a 3/4" torque wrench, that goes up to 600 ft-lbs.
With a fine pitch like 16 tpi, it's double the axial compression that 8 tpi exerts, and 8tpi is a common 1" thread. That's why you see action makers that use 20 tpi threads, suggest lower torque values, it's the axial torque value that you're going for. Barrels are relatively soft, the equivalent to a grade 5 bolt. Receivers are harder than barrel stainless.
I'm sure their 'secret' is they've played with the reamer specs in terms of bullet jump/jam, throat angle and throat diameter, to work with one bullet.
When we were shooting test targets for the M15 series, we had more than a few that shot some unbelievable groups, in the .1" range. We'd do reshoots of those, so it would be a larger group. This was typically with Lapua 175gr GB550 or the 69gr Lapua loading. Other calibres that we couldn't get Lapua ammo for never came anywhere near what we could get out of the Lapua ammunition.
With a fine pitch like 16 tpi, it's double the axial compression that 8 tpi exerts, and 8tpi is a common 1" thread. That's why you see action makers that use 20 tpi threads, suggest lower torque values, it's the axial torque value that you're going for. Barrels are relatively soft, the equivalent to a grade 5 bolt. Receivers are harder than barrel stainless.
I'm sure their 'secret' is they've played with the reamer specs in terms of bullet jump/jam, throat angle and throat diameter, to work with one bullet.
When we were shooting test targets for the M15 series, we had more than a few that shot some unbelievable groups, in the .1" range. We'd do reshoots of those, so it would be a larger group. This was typically with Lapua 175gr GB550 or the 69gr Lapua loading. Other calibres that we couldn't get Lapua ammo for never came anywhere near what we could get out of the Lapua ammunition.
I have never seen a recognized 3 shot bench rest record.
As far as I know all bench rest records are either 5 or 10 shots , depending on the organization and the distance
Cat
Now there is the Bestest FACT ! on Here !
Maybe a moderators finger slipped hehe
I noticed that. Why erase something positive that straightened an issue out ???
Jonnyofalltrades
Regular
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- North-central Saskatchewan
The thing everyone has to remember is that the term "curmudgeon" originated in the early days of the English language, to describe men like Dennis. One might even take it further and modify the term to "old curmudgeon". "Grumpy Old Men" is not just a figure of speech. When I am old, I expect people to make allowances.WHY were you MEAN Denny ?
PGW makes a very good point. Torque applied to standard threads creates both axial and radial forces at the thread interface. Buttress and square create principally axial forces. This is quite desirable in certain applications. It should be desirable in rifle barrel threads as torque applied does not create a hoop stress in the receiver. BTW - square threads have been used in rifle barrels over 100 years ago with the Ross. (made in Canada )
However, for a given applied torque and thread pitch, square threads will create much more axial force than standard threads. My estimate is about 35%. Accordingly, to get the same seating force at barrel shoulder, less torque is needed using square threads. This is why it seems incredible that someone would spec 500 ft-lbs of torque on a Remington action using buttress threads - that would amount to the axial equivalent of 675 ft-lbs of torque applied to conventional threads.
)However, for a given applied torque and thread pitch, square threads will create much more axial force than standard threads. My estimate is about 35%. Accordingly, to get the same seating force at barrel shoulder, less torque is needed using square threads. This is why it seems incredible that someone would spec 500 ft-lbs of torque on a Remington action using buttress threads - that would amount to the axial equivalent of 675 ft-lbs of torque applied to conventional threads.
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jordanlillico
Member
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- fsj bc canada
65 ft/lbs
You can put any label you want on them. If they mostly shoot zero’s like you claim they would be winning matches left and right.
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