Load data help

[AngryBaker]

I recently purchased some Speer TNT 55gr JHP bullets and I am having some trouble finding some decent load data for these bullets.

I am looking to load these in .223 Rem with IMR 3031

I am also wondering if I can use the same load data I used with some 55gr FMJ rounds

I am using load data from the instructions that come with the LEE three die set. The LEE manual does not specify what type of bullet they mean by jacketed, it worked just fine with FMJ, the exact words used are in the manual are "55 grain jacketed bullet" my data for 55gr FMJ is as follows

Powder: IMR 3031 (22.0gr)
Brass: Mixed (mostly PMC and Federal)
Primer: CCI small rifle
Bullet Winchester 55gr FMJ

I am wondering if I can substitute the 55gr FMJ for the 55gr TNT JHP bullets.
If anyone has any load data for this specific bullet that would also be great.

Thanks
Angrybaker

 

[rcmodel]

Yes, you can.

Start at the start load and work up.

Just so you know, the TNT is a very thin jacketed bullet intended for slow twist barrels in things like the .222 Remington.

If you are shooting them in a fast twist .223 at MAX load speed, they may blow apart in mid-air from the velocity & rotational speed.

rc

 

[AngryBaker]

Thanks RC helpful as always

What constitutes a fast twist in terms of these bullets? I do not plan on going past 22.0 gr of IMR 3031 with these rounds max load is 24.3gr

I plan to shoot these out of a 1/9 Twist AR-15 and I have a savage model 11 which I believe is also a 1/9 twist, Would this be okay as long as I keep it near the starting load (21.6gr)?

 

[kingmt]

If you are shooting them in a fast twist .223 at MAX load speed, they may blow apart in mid-air from the velocity & rotational speed.

rc

That sounds fun.

 

[rcmodel]

Would this be okay as long as I keep it near the starting load (21.6gr)?

I don't really know how much they will take.

I'd just start working up until you start seeing grey vapor-trails on the way to the target.
That right there is too fast.

BTW: A .222 Rem with 1-14" twist.
3,000 FPS = 154,256 bullet RPM

A .223 1-9" twist:
3,300 FPS = 264,000 bullet RPM.

rc