Most problems which modern shooters experience with the .44-40 are caused by the lingering effects of black powder-era design practices, dimensions and tolerances. Lyman’s standard bullet for the .44-40 #42798 copies typical traditional .44-40 lead bullets. It has two lubricating grooves which hold a generous amount of lubricant, needed to keep black powder fouling soft. It weighs 217 grains if cast in pure lead or about 215 grains in 1:40. Cast bullets of the black powder era did not require a crimp groove, because a compressed case full of black powder prevented bullets from telescoping into the case under magazine spring compression. Crimping the case mouth over the ogive was sufficient to prevent inertial dislodgement in revolvers, because .44-40 loads have milder recoil than their modern, smokeless powder, magnum counterparts.
In the .44-40 loading bullets heavier than about 230 grains, the base is below the neck, into the powder space, if cartridges are kept at a length to feed in magazine rifles. If smokeless powder is used, bullets require a crimp groove to resist their being telescoped back into the case, under compression of the magazine spring. Accurate bullets 43-215C, 43-230G and 43-230EB have substantial crimp grooves, while also having adequate lubricant capacity to prevent foul-out in rifles if black powder is used. A compressed caseful, about 24-26 grains of RL7, depending upon bullet, or 20-22 grains of 4198, provide adequate base support to the bullet in the same manner as black powder does, producing full-charge blackpowder ballistics within standard pressures which are safe in the 1873 Winchester and modern clones, and may also be used in revolvers, giving results identical to pre WW2 smokeless loads assembled with Sharpshooter powder.
My S&W Model 544 Texas Commemorative revolver has .4285 cylinder throats and .429 barrel groove diameter and is very accurate with either factory jacketed .44-40 loads, or handloads using SOFT 8-10 BHN bullets of .429 diameter. Mine is in 5" length and is very accurate with Accurate 43-230G with 24.5 grains of RL7. Severely undersized factory .425-.427” bullets being shot in throats and chambers cut for .430 or larger .44 Magnum projectiles, is a recipe for poor accuracy.
Pre-WW2 .44-40 revolvers having groove diameters of .424-.427” require chambers cut to Min. SAAMI dimensions for use with .427-.428" bullets, with cylinder throats not exceeding .4285”. My Ruger Vaquero as purchased had excessively tight chambers with .444 neck diameter and .425" cylinder throats which precluded loading bullets large enough to fit its .429" groove diameter. The fix was to have John Taylor rechamber the cylinder, enlarging the chamber necks to .447 and the cylinder throats to .4305" so that I could load .430" bullets in Starline brass, which has 0.007” mouth wall thickness, and holds up very well to repeated reloading with ‘92 Winchester style .44-40 +P loads.“
Modern factory 200-grain soft point smokeless loads have a deep cannelure at the case / bullet base juncture to support the bullet base, having a case neck length of about .33 " Winchester and Magtech Cowboy loads have a longer neck to support the 225-grain bullet then-used, whereas Winchester component brass has the common .33” SAAMI neck with rolled cannelure at the base of the bullet.
John Kort has recommended that case necks be sized .03" longer than bullet seating depth to give needed base support in addition to the crimp. This is consistent with industry practice in loading lead bullet ammunition in other calibers, such as the .38 Special, and is necessary when using smokeless powder due to increased free airspace in the case. The common .33" SAAMI length neck in the .44-40 does not work well with smokeless powder when loading “historically correct” black powder bullets, such as #427098, which lack a crimp groove, requiring that they be crimped over the ogive or front band, if the bullet has one. This is because the unsupported bullet base yields under magazine spring compression, increasing seating depth, which can cause a steep pressure rise with fast-burning smokeless pistol powders!
An effective expedient, recommended by Kort, and with which I agree, is to grind .10" off the base of the sizing die, to allow the case neck to be set back up to .40," to allow use of heavier bullets for hunting purposes, ensuring adequate base support. Sizing can then be adjusted as required for the particular bullet. Having this capability is also necessary when loading .44 Speer shot capsules in .44-40 cases, because the base plug-obturator, requires internal support from the case wall to prevent its being dislodged, to prevent spilling shot into the powder space.
The Lee Factory Crimp collet die has recommended to provide a suitably strong crimp for lever-action rifles. The Lee FCD sizes the cartridge neck to 0.001” less than SAAMI Max. cartridge dimensions, which will size bullets over .429” by compression inside the case when loaded in Starline brass. If your .44-40 rifle or revolver requires bullets larger than .429" to fit an oversized barrel, then it is necessary to hone the neck sizing collar of the Factory Crimp Die to a diameter of .446" to avoid sizing bullets inside the case. The LFC die will also cold-form a crimp groove onto bullet to hold them in place when the chosen bullet has none.
Current bullet designs favored by Cowboy Action Shooters are variants of the traditional Ideal #42798 or as it is called now by Lyman 427098. Accurate’s 43-220C is 427098 with a crimp groove added:
http://www.accuratemolds.com/bullet_...=43-220C-D.png Accurate’s 43-215C resembles 427098 with additional lube capacity for use with GOEX and other “more fouling black powders” – plus a crimp groove:
http://www.accuratemolds.com/bullet_...=43-215C-D.png Most commercial .44-40 Cowboy loads assembled using cast bullets the Magma Engineering bullet which has a crimp groove. Desperado bullets offers this bullet in a soft alloy with flat base, which SASS shooters feel is superior:
http://www.cowboybullets.com/44-cal-200-grain_p_21.html
Fast powders help to upset undersized bullets. Trail Boss appears to have a quicker pressure rise than even black powder. John Kort found when testing different brands of Cowboy ammunition, that Hornady Cowboy ammo assembled a swaged 200 gr RNFP bullet produced throat leading in his Marlin ’94 Cowboy rifle. Pulled bullets measured .424” on the body and as small as .421” at the base, apparently being reduced from their original .427” diameter during the loading process. No wonder they leaded in his .4285” groove! Kort reloaded the Hornady bullets over 6.5/Trail Boss, and got no more throat leading, with much better groups. Lesson learned.
Another factor with .44-40 brass is that all of it is thin walled and fragile. If you are not careful and deliberate in case sizing, mouth expansion and separately seating and crimping bullets, the ham-handed novice will wreck a great many cases until one learns to slow down and pay attention. Loading the .44-40 for good results is not a task for the novice.
The .45 Colt is MUCH easier to load.