I have a 325NG. 230 ball is tough with wood grips, but not too bad with the Pachmeyers that cover the backstrap. I put about 50 rounds of 185g critical defense +P and it was tolerable. I still think it has less recoil than a lightweight j-frame with standard 38s, but no one seems to believe me.
A direct comparison between the 325pd and 325 nightguard is touch to make in terms of felt recoil.
I have a 325sc (clear cote version of the pd). With the grips I have on it , it weighs 23oz. Published weight with factory grips is 21.5 oz.
The nightguard weighs in at a published 28 oz due to the stainless cylinder vs the titanium cylinder on the pd.Depending on grips that weight could increase or decrease slightly.
I've fired a mild 200 gr auto rim load from PMC thru my 325. I've also fired 230 ball ammo.The 200 gr auto rim load was relatively mild. The 230 ball is a bit more stout. While it isn;t painful, range time with it might be logically reduced.
If I had to equate it to something else, I'd say a 19 oz j frame with 158 gr +p load.
I beleive both guns are rated for any factory acp round. There is no restriction listed in the factory literature I have with the my 325.
It may not seem that 6 oz or so in weight would make a big difference. But shooting hotter loads would likely make the nightguard easier to shoot.
Overall my 325sc is pleasant to shoot and is extremely accurate.
The only +P load I've fired in my 325NG is the 230gr XTP +P from Hornady. I haven't had a problem with them crawling out of the case but I've only fired about a dozen of them. I did stop after four rounds during each cylinder full to see if the last two were growing. I've also had no problems with either CCI's 230gr Gold Dot or Winchester's 230gr SXT bonded standard pressure loads.
I have had 230gr Blazer ball pull the bullet while Winchester's white box 230gr ball seems fine. Handloads require a very heavy taper crimp or bad things happen.
In my 325NG I have fired 230gr ball, 230gr Rem Golden Sabres, Rem 45AR and Rem 185 HP +P, with no problems.
I use the smooth wood gris, Ahernds I think. The rubber Pachmeyr grips seem too big to me.
I really like the 325NG, but like all alloy framed handguns I consider it somewhat of a light duty gun. To be carried a lot and not shot a "whole lot".
I've gone to a set of Ahrends grips too, I can hide this little cannon stuck down in my Cabela's Short pants with an untucked T-shirt.
I'd agree it's not a gun you'll shoot frequently. I've found that you need to check all the screws after less than fifty rounds as they tend to vibrate loose. During one session the cylinder latch button and screw fell off into my hand.
I also added a set of Bowen's Rough Country adjustable sights to mine and the little beast is very easy to hit plates on a rack or dueling tree at normal distances.
I'm seriously thinking I need a steel framed M25 or M625 set up the same way for a practice gun.