12.7x44r loading problem

[doc o]

I've got a Husqvarna roller in 12.7x44r.
After getting my loading goodies I've run into acouple of problems.
1. bore is .515 but can't chamber this bullet so it's a tight chamber.
Q. Do you think a .510 bullet of soft lead will bump up OK to bore?
2. I'm using BACO .348 brass sized to 12.7x44r and the head is small enough so exstaction isn't the best.
Q. Should I use this brass or go with 50-70 brass and turn down to fit? I've heard of this being done before.
Any ideas? Mostly on the chambering problem.
Thanks
Doc

[Ray Newman]

Make a chamber cast and take careful measurements. Make sure you run the cast deep enough to include the throat and some of the rifling.

Next find the dimensions for the original 12.7X44Rmm round and the .50-70 Gov't, then compare the two to the rifle's chamber.

This just might very well save you money, time, as well as a good deal of frustration trying to finding a round that fit and shoot with some semblance of Accurrracy.

The chamber could very well be too big, too long, too small, or might have even been "altered’.

From what I recall reading and hearing from 12.7X44Rmm owners, some rifles had their chambers altered with a .50-70 Gov't reamer to accommodate the larger diameter of the .50-70 case head or base diameter, not the .50-70 rim diameter.

[doc o]

Thanks Ray.
I will have to do that.
The bit I've been playing around with it it's not a 50-70 chamber, to tight.
I've been reading everything I can find on this cal. the last couple of nights and it sounds like some took a small
bullet of soft lead, .500 hollow base to .508.
I may have said this but the barrel slugs .513-.514 bore and .480 lands.
I tried a case expanded .508 and I could feel slight resistence as I chambered the brass .
I'll have see about a chamber cast.
Thanks again

Doc

[doc o]

I've got the old girl up and going.
The chamber was not 44mm. I had to trim the brass to 42.5mm.
Using a 515141 bullet sized to .510. Chambers great. I don't think it will take a bigger bullet.
Better yet it shoots great.
I started out with a load just to test and at 50 yrds. just to make sure I was on paper.
I only loaded 3 rounds [still waiting for a part for the trimmer for more rounds] and all 3 rounds were
on top of each other.
The rim is a bit small but ejects OK.
Now to get some more brass trimed and see how it is out farther the 50 yrds.
Thanks for the help.
Doc

[qualibra]

Hello .

I am a Norwegian BPCR shooter .
This cartridge has its origin in Sweden as well as in Norway .

Her is what we use to do when loading for this old rifles,
which we do a lot .

There are several bulletmoulds to choose from .
I use both Lyman plains 395 gn, Lee 450 gn
and Lee 500 gn .
The latter two of those are too big out of the mould to chamber
and i therefore use to size them down in two steps
to get a dm of .501" .
The first step is through a .509" lubesizer and i finish
by pushing them through a .501 Lee sizer wich mounts in to
a regular reloadingpress .
Cast in pure lead they bump up just fine and shoot very tight
groups at 100 meters and at even longer ranges .

The Lyman plains are .503" out of the mould, and does'nt
need any further treatment other than lubing .

I use to charge this cartridge with 65 gns of Swiss#4 .

Good luck !

[John Boy]

I use to charge this cartridge with 65 gns of Swiss#4 .

qualibra is using the Swiss European grain designation. Swiss #4 powder is sold here in the US as 1 1/2 Fg.

The Swiss sold to shooters in the U.K. goes by the Swiss grain size numbering system.
Converted to the U.S. Market system.
Swiss #1 powder is sold here as 4Fg.
Swiss #2 powder is sold here as 3Fg.
Swiss #3 powder is sold here as 2Fg.
Swiss #4 powder is sold here as 1&1/2 Fg.
Swiss #5 powder is sold here as 1Fg.

[Bad Ass Wallace]

I have a 12.7x44mm in a Swedish roller. I use 450/400 Nitro cases which when cut to length are a perfect fit to the original extractor.

My load is also 65gn Swiss No2 (FFG) and the Lyman 515141 bullet sized to .510

I was very impressed with the first target at 100yds (after a sight correction with the lower two holes)



The bore is in exceptional condition!