DanM
07-09-2007, 02:23 PM
I traded around and ended up with a very nice Blackhawk in .30 carbine. A revolver that has been high on my wish list for some time. This one is like new, and very tightly chambered. I think too tight for cast boolits. Chamber throats will just barely pass a .308" bullet. I had to tap on some to get it through. I did chamber casts, and all were just .308". Bore is .308". Also, I will have to trim my brass shorter for the rims to clear the breech face. all my new and used .30 carbine brass measures 1.287-1.290", they are too long, and rub on the breech. Even some factory Remington ammo will almost lock up the cylinder. I ran a box of Remington 110 ball through it saturday, and probably a half dozen wanted to lock me up. I am testing different lengths of trim. If I trim to 1.272", that puts the bottom of the rims flush with the rear of the chamber, which probably leaves a little too much gap between the cases and breech. Trimming to 1.281" seems about right, as it closes the gap some, and case heads don't drag. I will put the feeler guages on it tonight and measure the gap I am getting more closley.
So....I am wondering....(1) Is there an optimum gap to shoot for when I start trimming cases? I am talking about the gap between the rear of the case and the breech face? and(2) Advice on honing these throats to .309" for cast bullets.
I know Ruger has good customer service, but in this case, I think they would say that the cylinder is "within spec", and not work on it.
So....I am wondering....(1) Is there an optimum gap to shoot for when I start trimming cases? I am talking about the gap between the rear of the case and the breech face? and(2) Advice on honing these throats to .309" for cast bullets.
I know Ruger has good customer service, but in this case, I think they would say that the cylinder is "within spec", and not work on it.