Good question, and I do not have an answer. That model shows up similar to the Original government Bullet nose. From past experiences shooting an original 1881 Arsenal bullet from a Paul Jones mould that I won at Pala CA many years ago. It requires considerably more elevation than my Same loads with the NASA or Money bullet in my 45-110 using the same charge and wad combo. The bullet was originally designed to smash bone and meat to shoot through horses, from the trapdoor. I was interested enough to design a pp mould with this nose profile for hunting. It’s offered by BACO and is fairly popular. Designed to shoot in a fouled barrel, using thick paper and a large amount of grease cookie behind it, the diameter is .441. It’s proven successful on big game under 200 yards. But it’s no target bullet. Too much bump up is required, I tried a .441 bullet once in competition, it was a failure. This round nose though at .445 or .446 diameter might be a horse of a different color then. This nose design abet in grease groove came about from the Sandy Hook tests. That took place after Creedmoor shooting had become rather dormant. In the afore mentioned PP, it would be closer to the original Sharps long range bullet than compared to today’s money/Metford nose profile. I am not curious enough to drop the $215 for a mould. Due to its shape a patch would be required the full length to where the nose radius begins. Otherwise it would lead.steveu834 wrote: Tue Mar 18, 2025 7:41 am Would the Hemispherical Flat Base model give a better picture of what the bullet is doing versus the G1 model?
http://www.geoffrey-kolbe.com/HFB-projectile.htm
Though I believe plenty of National Guard units spent range time with this bullet in the 45-70. Though a modified 45-90 Trapdoor marksman model was fielded at Sandy Hook. It does seem to have lost favor over the years for long range competition. Yet remains a favorite for hunting even in solid form for Dangerous Game. That was my reasoning behind my .441 design close shots and decent hunting accuracy on tough critters. At one time before my accident, I had planned on a Cape buffalo hunt using that bullet in my 45-110 business rifle. I probably would have added some antimony to the alloy to toughen it up some. Though I did test it at 10-1 and had good accuracy. At 16-1 it busted a Buffalo rib and passed through more than 10 inches of Buffalo spinal column, resulting in a nearly instantaneous kill. That was with the 1881 Jones greaser.
So long story short, that bullet model is intriguing, I haven’t the mental agility or facilities to effectively integrate it into any ballistic program.
Plugging my muzzle velocities into the G1 programs the drops at 800-1000 yards are always within .5 MOA. When entering a BC of .460 they are virtually dead on, at .425 they are close as I said, within .5 MOA. That’s all entirely dependent on the conditions for a given day.
I think the money or even the elliptical nose are closer to the G1 model than the flat base model. I maybe wrong, but my experiences say otherwise. Though it’s very thought provoking. Geez I wish I was smarter. lol
My real conundrum is why at times do our bullets go crazy at the PIP and other times they do not. It’s all about down range conditions, I know that. But is it at a specific down range velocity, partially due to alloy and speed can it be mitigated, or even avoided? Zack’s experience says it can be. Did Zack move the PIP to a point that it is no longer effecting his scores due to alloy and speed, I would say so.
We do not see The PIP in modern cartridges such as my Swede 140 gr bullets or the 190’s I used in my model 70 06 bolt gun. They were still traveling too fast at 1000 yards.
My labradar is going to get a workout this spring.
Kenny Wasserburger