4227 and 125 TNT help

[bushmaster225]

I have just recently got into the 300 Blk game. I have only been able to find IMR 4227 powder. I currently have 125 TNT, 155 AMAX, 155 CC. Also have Wolf SR, Rem 7 1/2 and CCI 400 primers

I'm looking for load to test out my new build until I can find some W296 or H110.

Thanks in advance.

[dubhelix]

Hodgdon (IMR) specifies 16.5 min and 17.7c max with IMR4227 and 125 grain bullets (Nosler BT).

[ScottB70]

There's free data on here for IMR 4227:

http://www.hodgdonreloading.com/

Some of the bullets listed at Hodgdon are the same weight, but not the same specific bullet as the ones you've listed here. Work up carefully.

[afshirt]

Please post back when you find a good combination on these. I have 2K of the 125TNTs and quite a bit of 4227 and haven't gotten a chance to develop a load for them yet.

[dubhelix]

My load for this bullet/powder combo is:

PNW Brass, trim 1.358"
CCI BR4 primer
IMR 4227 = 17 grains
Speer 125 TNT
COL = 2.06"
no crimp.

Doesn't take that long to work up your own and find what is most accurate/safe in your rifle.

I like this powder because a) I can find it and b) it meters well for me.

Doesn't seem to generate especially fast velocities, oh well.

[Jargonhead]

I've run a resized AK pull behind 18.4 gr of 4227 at 2015fps, not too bad at 3 ' at 100yrds, I save them for H110 at 19grn running out of a 10.5 WOA barrel suppressed at 2100fps. 2' at 100yrd, good enough for me

Rob

[afshirt]

It seems like 17g of 4227 is a sweet spot for a lot of different weights. I run 17g for my 150g FMJs plus I have seen a few loads for various other weight projectiles around 17.

[afshirt]

My load for this bullet/powder combo is:

PNW Brass, trim 1.358"
CCI BR4 primer
IMR 4227 = 17 grains
Speer 125 TNT
COL = 2.06"
no crimp.

Doesn't take that long to work up your own and find what is most accurate/safe in your rifle.

I like this powder because a) I can find it and b) it meters well for me.

Doesn't seem to generate especially fast velocities, oh well.

When you say no crimp are you just using neck tension to hold the bullet in? I have always used the Lee FCD to put a crimp just light enough to see the ring around the neck on all my AR loads but will this particular bullet be affected negatively by it?

[dubhelix]

Correct, just neck tension. I don't crimp my 77 smk's in .223 either. I suppose if I had any bullets with a cannelure, I'd crimp. I've though about getting a Lee FCD, though crimping is one more variable to account for, and one more step to perform. I don't know if the Speer TNT will be negatively effected by the FCD. It is a thin-jacketed varmint bullet lacking a cannelure, so I guess it's possible that crimping could distort the jacket and lead core, and might detract from accuracy/consistency, but I don't really know.