.41 mag. cylinder throat reaming

[knifemaker]

After doing a search for several hours, I can not locate anyone that does cylinder throat reaming for a Ruger Blackhawk in .41 magnum caliber. Everyone does 45 Colt and a few will do .44 cal. and 38/357 cal.
I have a Blackhawk that the barrel groove dia. is .409 and the cylinder throats are .408 and needless to say it is not accurate with cast bullets sized .410 due to the small dia. cylinder throats. I even checked Midway and Brownells for cylinder throat reamers and no luck for .41 caliber.
If any of you know of a gunsmith that will do cylinder throat reaming on a 41 mag, let me know. I had cylindersmith do a Ruger 44 special for me a while back, but he is now only doing 45 cal. per his website. I do not recall even if he did 41 cal. when he was doing other calibers beside 45.:coffeecom

[John 242]

Sorry the only .41 cal. throat reamer I could find was from PTG and it was a .408 dia. Wish I could help.

....I'm sure that PTG would cut you a .409 or .410 reamer, but you'd have to call for pricing.
http://shop.pacifictoolandgauge.com/index.php?main_page=index&cPath=1

The .408 was $66. What they would charge for a custom size, I do not know.
Again, wish I could be more helpful.

[Tatume]

Please don't get angry at me for suggesting it, but I would recommend that you clean and check your throats again with a plug gauge (a Sierra bullet will do). If it won't accept a 0.410" plug Ruger should fix it for you. Anything less than 0.410" is out of spec.

[44man]

Yes, check a bunch of times.
You can lap the throats very easy by yourself. Do each until a boolit of the right size just pushes through. Takes time, the steel is hard but it pays off big time.

[Mal Paso]

You might call Manson Reamers. They don't have a 41 cal. in the catalog but they might make one for you. I have a .431" with pilots I've been happy with.

[knifemaker]

Thanks for the replys. I have double checked my throats prior to posting and the slugged at .408. Used a mike, not calipers to check the dia of the soft lead slugs. I am considering honing the throats out.

[bgokk]

:(

I had cylindersmith do a Ruger 44 special for me a while back, but he is now only doing 45 cal. per his website. I do not recall even if he did 41 cal. when he was doing other calibers beside 45.:coffeecom

I had Cylindersmith do my .45 Colt Blackhawk at the end of last year and at that time ask about having my .41 Mag done. My .41 (.41 Mag. Groove = .4119” Throat =.4117”.) He said, as you noted he was not doing anything but .45's and that his reamer was smaller than than my throats anyhow. :(

I am going to polish them with some 3M wet or dry polishing paper. Going slow and checking often.

Brooks

[knifemaker]

Fellas, thanks, here is a update. Problem solved. I happen to have a good flex hone of the right size. I honed all 6 throats to where I can thumb push a factory .410 jacket bullet though the throats. My push though jacket bullet was dead on at .410 with 4 measurements around the bullet. When I get a chance to get to the range, I expect better results and hopefully no more 3-4 inch groups at 25 yards.
I love my two Rugers, 44 spec. and 41 mag. but both did have undersize throats that had to be opened. Cylindersmith did my Lipsey 44 Spec. Blackhawk over a year ago and it went from 3 inch groups to groups around 1-1/2 inches with my cast hunting loads.
Again thanks to all for taking the time to respond to my question.