curious about this

[country gent]

I have a 40-65 due soon and am putting together some fire form loads with 45 grns 2 f goex 1/8" spg grease cookie and lyman 400 grn bullet lubed with spg to fire form the cases and break in / season the barrel. Im curious on this case size what the diffrence in velocity would be between 2f and 3f. Any estimates ideas? Appreciate the help here/ Thanks

[gandydancer]

Fire form?? All I ever did using 45/70 brass was trim to length and load using 40/65 RCBS dies. black powder in. a cork wad over powder. grease cookie. OJ wad over grease cookie. a lead boolit. and than BANG. using smokeless same thing. except after over powder cork wad I than use a filler-OJ wad grease cookie OJ wad-Boolit-Bang.

[Don McDowell]

Leave out the grease cookie and just go with about 55 grs of that 2f powder. There was about 100 fps difference in the wife's roller between 3 and 2f with the snover.

[country gent]

I will probably do away wit the cookies after this Don. I want the extra lube there for the staring loads. Maybe a little paranoid but oh well. Thank-you I was curious about the diffrence there. Im expecting about 10oo-1050 with these loads. Maybe 1100. Im just starting out here and .....

[Gunlaker]

My experiences with Goex FFg Express vs. Goex FFFg Express show nearly 100fps difference in my .45-70's. That's with 68gr of powder and a 535gr grease grooved money bullet. I don't know about the .40-65 as I've not done any load development for mine yet.

Chris.

[Don McDowell]

I'ld guess your velocity at about 1000 if lucky. We only got about 1150 with a case full of 2f and the snover.

[Bad Ass Wallace]

I believe fire-forming loads should be more toward maximum loads and shooting clean between shots than simply starting 'light'. To obtain good cases you need the virgin brass to expand fully to seal your chamber, then in the reloading process, you control the amount of sizing necessary (by adjusting the FLS die) to just get that case to re-enter the chamber. I also found the Starline brass required annealing from new to be soft enough the readily expand and seal the chamber.

I have 100 match cases that were fired with 63gn 2FG behind a 392gn Lyman tapered boolit (on LHS), which is almost like a breach seated arrangement. Each case is indexed upon firing and indexed at sizing. The 10 shot group shown is about typical of my fire-forming loads at 100yds.

http://img.photobucket.com/albums/v152/BAWallace/My_cast_45.jpg (http://smg.photobucket.com/user/BAWallace/media/My_cast_45.jpg.html)

http://img.photobucket.com/albums/v152/BAWallace/ericsrifletarget2.jpg (http://smg.photobucket.com/user/BAWallace/media/ericsrifletarget2.jpg.html)

[sharpsguy]

You are wasting your time, powder, lead, and primers fire forming the 40-65. Load it up with 55 to 58 grains of 2f black and your favorite bullet and shoot it like you mean it. The 40-65 is a great caliber, BTW.