Trying new 223REM bullets and primers

[Significent]

I'm getting ready to switch the bullet and primer brands I've been using to reload 223REM. The cases and powder will remain the same. Here's what I have:

Cases: LC98
Powder: H335

Old bullets: 52gr HPBT Speer Match
Old primers: WSR (Winchester Small Rifle)

New bullets: 52gr HPBT Sierra Matchking
New primers: CCI 400 (Small Rifle)

Although the brands have changed, the specs on the replacements are very similar. Should I start from scratch or can I make any assumptions at all about optimal powder weight and COL for the old loads being similar to the new?

Thanks!

 

[WalkerTexasRanger]

Start light and work up. Tho ogive of the bullets will be different creating different pressures.

Safe shooting!!!