450Bushmaster.net

I did some experiments at 110 yards with the new rifle, I'm not very satisfied, next time I try to reduce the loads.

The best result I managed to do with 200 grain FTX bullets at 110 yards
I am struggling with the FTX 250 and 300 XPT and XPT MAG.
Velocity turned to feet
2503
2562
2601
2562

Eureka
110 yards

primers?

CCI 450, I also tried the Federal GM205M but I had gunpowder ignition delays, especially with light 200 grain bullets.

P.S. Freebore 1 mm

This ammunition is structured on a cylindrical case which has a considerable capacity.
As it is structured, the cartridge has a thermobalistic system that is built on a very subtle balance, which stands at the limit of what is commonly defined as "ball stop".
The term "ball stop" means that particular thermobalistic condition in which, at the moment of striking:
- the dust placed near the flash hole begins to ignite
- the pressure begins to rise
- the bullet begins to imperceptibly move forward
- moving the bullet forward causes the internal pressure of the cartridge case to drop sharply
- the combustion slows down dramatically until it almost stops
- the bullet stops at the level of the beginning of rifling
- combustion begins to resume
- the pressure rises again
- combustion progresses, positively influencing the development of the pressure - time curve, and the projectile begins to move slowly
- the combustion of the launch charge reaches a percentage of the original mass such that the projectile is accelerated inside the barrel, until it is expelled from
the same

The phenomenon just described, normally takes a few tenths of a second to complete, but can also take place in times of the order of a few seconds !!!
Anyone who has clumsily loaded the cartridge in question, has experienced on their own skin what it means to cause a ball stop.
In some cases, at the moment of the dog's fall, a dark noise is heard (also perceptible when wearing shooting caps), followed by the roar of combustion.
On the other hand, in other cases, no noise is heard at the moment of percussion and only after a few moments that seem interminable can the roar of real combustion be clearly perceived.

Test with cast bullet Brooks mould for muzzleloading rifle.
538 grains powder coated.

now that's a hunk of lead!!!

any idea on speeds?

1150 fps.
Maximum load with 26 gn 1350 fps but not accurate.

The rifle has not fired well for some time and today I discovered that the screws of the weawer slide have been unscrewed.
Damn, I'm going to try tomorrow if everything works fine.