45 colt sizing

[West Creek Charlie]

Veral

I have a Colt SAA that I will be shooting your 250 WFN lubed with LBT blue or Felix Lube and cast of straight wheel weights.

I had this pistol worked over by Jim Stroh - new cylinder and taylor throating. I have been getting some leading in the freebore area and in the lands of the rifling just past the freebore area.

The throats are sized in the mid .452's and the bore is .450. I have been using hard cast - 16-18 brn rnfp. With my lighter loads and 200 grain bullets the leading is light but 250's and a hotter load of red dot or 231 I get leading.

I slugged the freebore area and discovered it was sized .454. Should I open the throats up to .454 and size my bullets .453?

I have not lapped this gun yet. Although I do have your kit

I also have a USFA SAA with cylinder throats that run closer to .453 and are .0005 out of round. I was thinking of opening these throats up to .454 as well so I can use the same ammunition in both revolvers.

If I open up the throats as per your intructions can I expect nice round throats or would it be reasonable to expect a little out of roundness?

Thanks
Charlie Blink

[Veral]

I would open both guns cylinder throats to accept 454 bullets.

   If you shoot softer bullets with your lighter loads it will probably stop the leading, which is caused by powder gas blowing lube off the bullets where they are rattling.  Using softer bullets allows them to slug up to seal off the gas blowby but also knocks the bullet out of balance.

    The throats may or may not come out round, but don't be concerned abou it as long as the smallest dimension is larger the the bores largest point.

    Most barrels are out of round, but they shoot fine.