First, I want to purchase a torque wrench in "inch lbs" but can't find one. I searched Midway, MidSouth, Cabela's and even ebay but none came up in the search. Where can I get one?

Secondly, does rate of twist effect velocity any? Example, if a particular load book says 3000fps using a 24" barrel with a 1:14 twist, would there be much/any difference if my barrel was a 22" with a 1:12 twist? Thanks for your help!

This may be what your looking for
Sinclair is a great company
http://www.sinclairintl.com/cgi-bin/category.cgi?catego...m=150-100&type=store

quote:

does rate of twist effect velocity any? Example, if a particular load book says 3000fps using a 24" barrel with a 1:14 twist, would there be much/any difference if my barrel was a 22" with a 1:12 twist?

Velocity is affected by barrel length but not as much as was thought years ago.....there's some good formulas but roughly 25'/sec per inch is a good rule of thumb. Your 22" barrel will shoot roughly 50'/sec slower than a 24" barrel

About twist rate.Since you put less rotational energy into spinning the bullet with a 1:14 twist than you do with a 1:12 twist it's reasonable to expect that one can achieve a bit more velocity with the 1:14 twist and I believe some factory barrels are made with this in mind. Weatherby .270 are 1:12 twist to help achieve velocity increases.

In fact the velocity gains are theoretically true but in my experience not large at all. As a matter of fact I've not seen this happen. If it really happens it's miniscule and a very poor reason to choose twist rate

Thanks for the replies.
Hairtrigger, that is exactly what I'm looking for thanks!

Vapodog, that was a good explanation. Thanks a lot!

Hairtrigger, where are you in Ohio?

.22 Hornet,

Where are you? I live/work in Butler CO.

quote:

Originally posted by vapodog:

In fact the velocity gains are theoretically true but in my experience not large at all. As a matter of fact I've not seen this happen. If it really happens it's miniscule and a very poor reason to choose twist rate

I'll venture that since the rotational energy is maybe 2% of the total energy imparted on the bullet during it's trip down the barrel, any change in twist rate is a fraction of that 2% and therefore less than the shot to shot variation.

Hi Doc, I live in the subdivision called Dutchland Woods, just off Yankee Road, about a mile from the RT 129 / I-75 exit. I moved here in March from Adams County.

quote:

Originally posted by Doc:
.22 Hornet,

Where are you? I live/work in Butler CO.

Wow. You live about 10 minutes from me. I live in Monroe off HWY 63. Most folks around here know about Monroe.

It's where the HUSTLER store is.

shucks even i know about monroe. they have the best cb radio shoppe in the u.s. . i like those guys.

if you ever need a radio fixed or tweaked they are the folks to see. good work at decent prices.

Well hi neighbor! I know exactly where Monroe is. Been there many, many times. Do you coyote hunt?

quote:

Originally posted by Doc:
Wow. You live about 10 minutes from me. I live in Monroe off HWY 63. Most folks around here know about Monroe.

It's where the HUSTLER store is.