Make sure that you have a clear line long enough to chamber the cartridge. I understand that some of the rolling block breechblocks hump up high enough to interfere, Martini actions are too short, while the Sharps are fine.
just how hard is it to ream out a 45/70 chamber to say a 45/110or 120? i have a emf 1874 sharps that i'd love to have taken out. seems to me since the chambers already there, it would act as a guide or pilot ,to keep the reamer in line and it wouldnt be that hard to do. any thoughts? mark
As it was explained to me by John King & others, the difficulty w/ re-chambering a .45-2.1" (AKA .45-70) to a longer cartridge is the set-up. First of all, the original chamber --hopefully-- will be in line w/ the bore. If it's not, that will only add difficulty to a seemingly easy task. The longer chambering reamer pilot must then fit the bore to perfectly & concentrically cut the new chamber. It is a job that requires some time, the right reamer, & the right touch. It's real easy to cut the chamber too long....
As for the throat, lead, etc., I'd discuss that w/ whomever is doing the work & then get 1or 2 more opinions. If you do have it re-chambered, have the gunsmith make a chamber cast & measure the bore so you can get the right case length & bullet dia. Will definitely save time & frustration down the road.
If you are contemplating re-chambering a rifle to a larger chambering, give the overall wt. of the rifle vis-a-vis the calibre some serious consideration.
I have a John King re-built 34" barrel, 14# Borchardt, .45- 2 7/8" (AKA .45- 110) w/ a shotgun butt. It does get tiring after 'bout 30+ rds or so. Lets me know real quick that I have touched off 95-100 grns of BP w/ a 535-540 grn bullet. & the larger chambers seem to shoot much better w/ heavier bullets. The heavier calibres in a light rifle or one w/ too much drop &/or a crescent type butt stock can be much more uncomfortable.
Short Stake, I think a .45-2.4" is a better cartridge. Prior history & today's match results seem to bear this out. The Sharps .45-2.6" was a very short-lived round. I follow the match results, & I don't recall seeing too many .45-2.6" rifles mentioned or in use. Of course, there are ,matches that I could have overlooked. I've talked to to a few .45-2.6" Shooters & seems it can be a rather persnickety round to shoot well. A few have gone the .45-2.4". Or throw all caution to the wind & get a .45-One-ten, which has more than enough steam for 1000+ yds & lets you shoot thru the wind.
John King--King Machine Service, Kila MT-- is a good gunsmith, but he is usually booked up. Same w/ Lee Shaver, the Pedersoli factory representative. Do a search for "John King" & "Lee Shaver" in this chatroom. Their addresses, etc., have been posted here in the past.
The problem w/ the Remington pattern Rolling Blocks & the longer cartridges is that often times the hammer needs to be "bobbed" to allow the longer cartridge case to clear the hammer nose.
The gunsmiths who know how to properly thread, chamber and throat an octagon barrel BPCR are far a few between. The really good ones often don't do much work for the public and don't advertise or are booked up 6 months in advance. I know of three--two are not taking work right now. Give Brian McEldowney at Lincoln City, Oregon a call and see if he will do it for you. His number is 541-996-4570. He has done quite a bit of work for me this past 2 yrs and does a good job. His phone number kind of tells where his interest is.
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