[bigkid]

This is my first time posting on this site even though I have read and got much info from everyone. I want to load 223 using nosler custom comp. bullets with imr 4198. IMR does not list a 52 gr. bullet in their data book and sierra load manual states19.6 to 22.4 grs. I am try to load this for competition shooting with my Rem 700. If anyone can help me out with this I would appreciat it.

[Walkalong]

IMR 4198 .223 Rem

53 GR. SIE HP @ 2.200" O.A.L.

19.0 Grs. for 2972 FPS @ 43,800 PSI - Start load

21.4 Grs. for 3268 FPS @ 48,200 PSI - Max load

From the Hodgdon (http://data.hodgdon.com/cartridge_load.asp) website. 53 Gr. data will be fine for 52 Gr. bullets

Welcome to THR. Start at 19.0 Grs. and work up.

[GooseGestapo]

I've used Imr and H4198 with 52 and 55gr bullets.

In several rifles, I've gotten best accuracy with both weights at 21.6gr, which is what Sierra lists as "max" for their bullets in 55gr.

FWIW, you can use any 55gr bullet data with the 52-53gr weights. The variation will be less than the variation between different 55gr bullets.
Velocity difference will be less than the shot-to-shot variation between individual rounds.

Also, observe the maximum seating depths. My Remington M7 with "Commercial .223Rem chamber wants the bullet seated MUCH deeper than the .223 "Nato" chamber will allow (AR and variants).

The Sierra and Berger 53gr FB (and Euber, if you shoot BR, you know who this is....) bullets are the epitome of accuracy to 200yds. Beyond this, the 52gr BT will have an advantage with slightly less wind-drift.

[Freedom in theSkies]

19 Gr. under a 55gr. FMJBT and CCI std primers in Military and Federal brass got me some pretty amazing groups...
My .02...
Cheerz!