brass resisizeing for a BPCR 1874

[cant_rope_the_wind01]

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I,m haveing some trouble wth my brass fitting, my chamber
I bought some starline brass from buffalo arms and when I run them through my dies i have no problem wth loading them in my chamber,i dont evan have to open the throat to seat the bullet
I also bought some norma basic brass and trimed them to exatly the same demensions of the starline brass, length & diameter
after running them through the dies and fire forming them they are still exactly the same as the starline brass,but when I size the throat to accept the bullet
I can only partialy open them and(to first grease groove) then have to use the bullet seater to push the bullet in (will this hurt the bullet flight) after pulling the bullet to check it it wasnt deformed at all,and i got perfect compression 1/16th if I size the throat fully to accept the bullet they wont fit the chamber as they get real tight & tend to want to jam, before they are in the chamber completly aproxamatly the length of the bullet
the only difference I can find, is that the norma brass is thicker than than the starline brass ,is this my problem????
what can i do to rectify this sitsation??
I am useing 45-110 (2 7/8") Sharps RCBS Legacy 3-Die Set
and its a pedersoli chambered in 45-110 2 7/8
I tryed trimming my norma brass .100 shorter and i got the same results

 

[DaveF]

Brass.

Hi there.
Your sized brass fits your chamber, so:-
1. Make sure your bullets are the correct size for your slugged bore, probably 0.458 - 0.459", and that the bullet nose fits/enters the bore correctly.
2. Find your starting overall loaded cartridge length by sliding a 3/8" dowel down from the muzzle of your unloaded rifle to touch the closed breech block. Mark the dowel right at the muzzle. Open the action and push an unloaded lead (?) bullet into the chamber, using a short piece of dowel, until the bullet seats against the throat. As you pushed the bullet in, it pushed the long dowel out. Mark the long dowel right at the muzzle again, and the distance between the marks, minus about 1/16" gives you a ball-park overall loaded cartridge length.
3. Expand the case neck, flaring it just enough to allow the bullet to start to seat without shaving lead.
4. Set the seater die to seat the bullet to the right depth while leaving the case neck flared.
5. Back out the seater plug, and screw the seater die in until the case neck flare is reduced enough that the loaded round chambers easily, or until it crimps the bullet in the case, whichever you like, then screw the bullet seater plug back in until it touches the bullet tip.

Your loaded cartridge should now chamber correctly.
Hope this helps, DaveF.