Smokeless Omega question

[Ninering62]

Would putting a wad of some sort under the sabot help the situation any?

Me & Decay just recently did some sabot load testing with 250gr Fury ST2P bullets in Harvester light blue crush rib sabots with N120 powder. We did start to see sabot degradation on the cup being almost pushed out flat & the edges burnt up.
We did test using 1/8 felt wads under them. It did help decrease the severity of the damage, not " completely ", but noticeably.
It did not affect the POI either if I remember correctly.

 

[HV-Muzzleloaders]

Would putting a wad of some sort under the sabot help the situation any?

It may help some, but it is not going to change the pressure that much. That pressure change will most likely be due to increasing the volume of the propellant chamber. In other words, it will not be like having a compressed load.

 

[LBAhunter]

I had the same problem with sabots and IMR4198. I went to H4895, which is a slower powder.

H4895 with what grain bullet?

 

[HV-Muzzleloaders]

H4895 with what grain bullet?

200 grain 40 cal. bullet. The TC bullets shot best in the Harvester HP blue sabots. 45/40.

 

[LBAhunter]

How many grains, if you don't mind me asking?

 

[HV-Muzzleloaders]

How many grains, if you don't mind me asking?

I have lowered the weight of H4895 to 85 grains, to reduce the pressure. The "QuickLoad" computer program I now use estimates the pressure to be about 29,000 psi, with a 200 grain bullet.

The shank of my barrel is 1.125" OD for about 5 inches in front of the action.

 

[ENCORE50A]

H4895 with what grain bullet?

I'm using H4895 with the 350gr XLD's. IMO a very good propellant for heavy bullets.

Satterlee test. I eliminated the charges, as they are safe in my rifle and may not be in any other.

 

[LBAhunter]

I have lowered the weight of H4895 to 85 grains, to reduce the pressure. The "QuickLoad" computer program I now use estimates the pressure to be about 29,000 psi, with a 200 grain bullet.

The shank of my barrel is 1.125" OD for about 5 inches in front of the action.

Just seems to me there would be a better more efficient powder for a 200gr than H4895

 

[HV-Muzzleloaders]

Just seems to me there would be a better more efficient powder for a 200gr than H4895

Based on my calculations on QuickLoad (Use at your own risk, because I am no expert.) I came up with the following numbers.

85 gr. H4895. about 29,000 psi. at about 2,826 fps. 78% efficiency (propellant burned)

100 gr. Acc4064. about 25,000 psi. at about 2,886 fps. 85% efficiency


That is with a 200 grain bullet.


.

 

[LBAhunter]

Seems like a waste of powder to me. I would want a better burn.

 

[LBAhunter]

I guess If that's the only powder you could find or had. It would work in a pinch.

 

[HV-Muzzleloaders]

I guess If that's the only powder you could find or had. It would work in a pinch.

If you have a better load for a 200 grain bullet in a sabot, please share it with us.

We are looking for a similar pressure with similar velocity.

 

[LBAhunter]

If you have a better load for a 200 grain bullet in a sabot, please share it with us.

We are looking for a similar pressure with similar velocity.

No. I don't have any. Which I really haven't been looking for any. I'm happy with my N110 loads with 155 - 225gr bullets.

 

[ElDiablo]

H4895 is great for heavy bullets.

This isn’t news to most of us, but, Reloder 7 is a great sabot powder with lighter bullets IME. Pretty similar pressure and velocity with a 200 ish grain bullet.

 

[LBAhunter]

I'm using H4895 with the 350gr XLD's. IMO a very good propellant for heavy bullets.

Satterlee test. I eliminated the charges, as they are safe in my rifle and may not be in any other.


View attachment 34269

 

[LBAhunter]

H4895 is great for heavy bullets.

This isn’t news to most of us, but, Reloder 7 is a great sabot powder with lighter bullets IME. Pretty similar pressure and velocity with a 200 ish grain bullet.

View attachment 34285

I was thinking N120 with 200gr bullets was right there with Reloder 7, too. I could be wrong, though.

 

[LBAhunter]

Yeah, i went and looked at the traces. 58 grs of N120 is around 32k. and around 2700.

 

[ElDiablo]

Yep, 58gr of N120 is right there in that ballpark

 

[Patrick McChristy]

Eldiablo thanks for posting this - I am going to work up a new load with N120 - just a little more to do on my 700ml build

 

[LBAhunter]

Eldiablo thanks for posting this - I am going to work up a new load with N120 - just a little more to do on my 700ml build

FYI - You can go to doug's message board under the smokeless section and review alot of traces.