Gunsmithing Recommended brake threading for Heavy Palma
- Thread starter mattmcg
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Re: Recommended brake threading for Heavy Palma
3/4 would work good but I would probably go 5/8 out of your choices. Reason being is when barrel is used up the brake will have a better chance at fitting something else.
Doing them custom I would spec it at .725-24tpi. To get there I use .925 muzzle diameter - .200 for brake to shoulder on = .725"
I have gone as little as .062" for a brake shoulder but only on large caliber very light weight barrels like this one. This one is 1/2-24 fit to a .620" diameter .308 barrel. This left a .060" shoulder.
This is a brand new Weatherby Mark 5 Sporter in 300 Wby.
Uploaded with ImageShack.us
Uploaded with ImageShack.us
<span style="color: #FF0000">Here it is after Cerakote. Note: range rod doublecheck for clearance.</span> You can't be to carefull with a customers rifle. Of course it was still perfect.
Uploaded with ImageShack.us
3/4 would work good but I would probably go 5/8 out of your choices. Reason being is when barrel is used up the brake will have a better chance at fitting something else.
Doing them custom I would spec it at .725-24tpi. To get there I use .925 muzzle diameter - .200 for brake to shoulder on = .725"
I have gone as little as .062" for a brake shoulder but only on large caliber very light weight barrels like this one. This one is 1/2-24 fit to a .620" diameter .308 barrel. This left a .060" shoulder.
This is a brand new Weatherby Mark 5 Sporter in 300 Wby.
Uploaded with ImageShack.us
Uploaded with ImageShack.us
<span style="color: #FF0000">Here it is after Cerakote. Note: range rod doublecheck for clearance.</span> You can't be to carefull with a customers rifle. Of course it was still perfect.
Uploaded with ImageShack.us
Re: Recommended brake threading for Heavy Palma
Hi Phil,
24 threads per inch is very common for brakes. It's just a good round number. Some people use 28 tpi. Neither 5/8-24 or 3/4-24 is a standard fastener size. No one stocks a tap or die this size. The diameter I select like .725" would be selected to give optimum strength and a good solid .100" to .125" shoulder to come up against. This helps keep the brake in time even after being removed and replaced many times.
I wonder how Remington ever settled on 1 1/16th 16tpi. Why not 1" or 1 1/8"?
Hi Phil,
24 threads per inch is very common for brakes. It's just a good round number. Some people use 28 tpi. Neither 5/8-24 or 3/4-24 is a standard fastener size. No one stocks a tap or die this size. The diameter I select like .725" would be selected to give optimum strength and a good solid .100" to .125" shoulder to come up against. This helps keep the brake in time even after being removed and replaced many times.
I wonder how Remington ever settled on 1 1/16th 16tpi. Why not 1" or 1 1/8"?
Re: Recommended brake threading for Heavy Palma
Use the largest thread possible.
The more meat you leave on the barrel the less likely it'll bellmouth, distort over time.
Cardinal rule!
Use the largest thread possible.
The more meat you leave on the barrel the less likely it'll bellmouth, distort over time.
Cardinal rule!
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