Question on Cone Cutter for BAT

[Walt Krafft]

Coming from ptg, how do you have any idea what the angle really is?

 

[Lucky Shooter]

If a difference of 1 degree is a concern, maybe you could get a print of this item.

This should indicate the dimensions and manufacturing tolerances-----might be a surprise
to see how much tolerance is allowed.

Also, there's also the question of-----"built to print ?" We just about have to consider
prints and spec's as bedrock----and go from there.

Maybe if you bother the PT&G folks enough, they'll eventually find somebody that
can help you with this.

Good luck.

A. Weldy

 

[Rich S]

I get about 0.002 difference across the width shank. It will be somewhat less across the bolt. I dont think it matters much it would create the tightest clearance at the OD.

 

[INTJ]

how do you know if the pic is right for the description
may be just a generic pic and what you will get if ordered is truly a 64 deg. cutter
look at other pics on PTG website, many are generic

I will check it when I get it.

 

[hoz53]

I will check it when I get it.

Manson makes what they call a 96 degree piloted feed cone reamer. it doesnt look like 96 degrees in the pic in catalog to me. mabie its for something else like revolvers,I dont know.

 

[INTJ]

Manson makes what they call a 96 degree piloted feed cone reamer. it doesnt look like 96 degrees in the pic in catalog to me. mabie its for something else like revolvers,I dont know.

I used the PTG version of that for the cone on the M-70 barrel I just chambered.

 

[hoz53]

I used the PTG version of that for the cone on the M-70 barrel I just chambered.

ok

 

[gunsandgunsmithing]

I get about 0.002 difference across the width shank. It will be somewhat less across the bolt. I dont think it matters much it would create the tightest clearance at the OD.

View attachment 1182369

Using your .261 dimension, why can I not just multiply .261 by the sine of 1°, which is .01745? Doing so, I get .0045544..or 4-1/2 thou.

edit... I read wrong. Say .296x.01745= .0051652
In a prior post I used a nominal .250 to the thread minor x .01745

FWIW, I would prefer it tighter at the chamber than at the od. i.e--a flatter bbl cone. Less unsupported case and better metering of gas and debris, in the case of a case failure.

 

[Eloudamy]

You are right--it does say 65 degrees on the actual reamer. They just made a mistake on the website listing.

BTW, yesterday PTG couldn't answer my question......

From managing a website, I can say the picture does not ensure that the written description is a typo. The picture is likely just what the web designer loaded because it represents the item you are purchasing. In other words, when setting up to photo the products, they likely didn’t take separate pics of the 29 and 30 degree readers but just loaded one for each product, preferring to describe the differences. If there is a different product number, then I’d believe there are two different readers available with different angles.

 

[gunsandgunsmithing]

From managing a website, I can say the picture does not ensure that the written description is a typo. The picture is likely just what the web designer loaded because it represents the item you are purchasing. In other words, when setting up to photo the products, they likely didn’t take separate pics of the 29 and 30 degree readers but just loaded one for each product, preferring to describe the differences. If there is a different product number, then I’d believe there are two different readers available with different angles.

A BAT uses a 65 degree cone, not a 64. The cutter pictured says "65 degree Bat".
What you're saying is true but in this case, it's reasonable and logical to assume that the 64 is a typo. But....a phone call is all itd take to find out.

 

[INTJ]

Oh yeah, what they sent me was a 64 degree cutter so I sent both tools back. Also, the cutter designed to take 6mm bushings wasn't large enough in diameter to cut a cone. I'll have to order their 65 degree tools.

 

[rangertim]

My breech was like the top pic. It fed really well. I remember just a time or so having the bullet tip hit the flat around the chamber when I was trying to run fast, above my skill level. And it was a 30 on a Grendel, so smaller diametrically than say a BR. I loved that gun and have regretted selling it at times.

Oh, and I remember seeing the abc designation on a print or at least in print somewhere. Actually, I think there were just b, c and no designation on the first series.

The A & some early B drop ports had the 14% cone with the 580 flat the late B & C Jerry went to the Remington bolt nose ! He said that some not so good at ready chambering prints or paying attention were cutting the cones 30% like a panda and he was getting to many calls on bulged brass at the Webb and was afraid of the safety so he just started using the Remington nose drop port Actions only. I have had all 3 styles ! My Rattler HBR Action had the 29% cone ! If memory serves me Right the late Larry kuse of KC who did a lot of gunsmithing cut the back of his Barrel flat on his drop port 14% cone with a flat !