Because you make an excellent product
I'm reporting my findings to save your customers some time. I wish that someone had done that for me.
For pistol caliber rifle shooting, the round nose - flat point (RNFP) bullets are the winner when viewed in terms of both accuracy and smooth feeding. The semi-wadcutter (SWC) bullets are not a good choice for rifle shooting. They were accurate at 50 yards (the maximum distance they were designed for) but their accuracy beyond that diminished. Also, the SWC bullet will not feed properly in any of the pistol caliber rifle designs, the 1873, 1892 or 1894. They will chamber just fine but will not feed smoothly. Your SWC bullets did function just great in my revolvers at 25 - 50 yards though.
The round nose (RN) and the RNFP bullets are equally as accurate. If a person has a Marlin or a Rossi in an 1892 or 1894 rifle design, then either a RN or a RNFP bullet will be equally as accurate and will feed just fine. However, if a person has an 1873 Winchester or any of the Uberti copies of this rifle (very common among cowboy action shooters), then the RN bullet will not feed as well as the RNFP. Go to the information pages on the Long Hunter Shooters Supply website, their information pages will go into great detail on why this is. My local gunsmith, Pioneer Gun Works, also a nationally well thought of cowboy action gunsmith, told me the same info.
For load data, Hodgdon is the best for pistol calibers shot out of a rifle. They have load data for both the .357 mag. and the .44 mag shot out of an 18.5" barrel lever action rifle. The other powder companies do not provide pistol caliber load data shot out of a rifle. It makes a difference.
Your bullets performed better than any other hard cast lead bullet that I tried and I bought 100 bullets from each of three other casters to test. Powders tested with your bullets included: IMR 4227, 2400, H110, Titegroup, 700X, and Unique. For accuracy, your bullets are about the perfect hardness at 18 BRN. Softer bullets did not perform well at all and harder bullet were accurate but produced too many flyers. The real test was your bullets against the copper-jacketed Hornady XTP bullets, which are considered to be very high quality. All of the powder companies provide load data specifically for this bullet. For me, in the .357 mag caliber, both your RNFP bullet and the Hornady XTP bullet consistently shot five shot groups of just over 1" at 50 yards off of sandbags, with a Marbles tang-mount peep sight. At 100 yards, the groups spread out to about 3" but I am certain that this is more a function of old eyes rather than the quality of your or the Hornady bullet. The kicker here is that your bullets will do this at about $50 per 500 bullets vs. $23 per 100 bullets for the Hornady XTP.
Now I won't lie to you, your bullets are great for target shooting. However, if a guy wanted a pistol caliber bullet for hunting purposes, then the Hornady XTP bullet would be superior because a copper jacketed bullet can be loaded to much higher pressures and thus much higher velocity than a hard cast lead bullet. For target shooting, high velocity does not produce accuracy. My best load with your RNFP bullet was 11 grains of IMR 4227 powder. This was the median recommended powder charge with this powder with a hard cast lead bullet. Still, this load produced good velocity at about 1,280 - 1,300 fps. Hodgdon told me that for a hard cast bullet, without a gas check, to not go over 1,400 fps and I will not have any bullet deforming or barrel leading issues.
Lever action rifles tend to shoot more accurately with a heavier bullet. Got this from my own experience and also the consensus of the silhouette rifle shooters at my gun club. The 158 grain bullet that you offer is about perfect. Also, at the 18 BRN of your bullets and not over 1,300 fps in velocity, there is minimal barrel leading with your bullets, the gun is easy to clean.
If someone says that your bullets don't perform, advise them to try a different powder. Often this will make a big difference in terms of accuracy. My 1894 Marlin likes IMR 4227. My Taylor's/Uberti rifle shoots slightly tighter groups with Titegroup powder. Excuse the pun.
That's what I know and what I've been told by experts. Hope that it is helpful. I'll be in touch when I need more bullets.- Fred