The Lee 225-55RF is "at one" with a particularly clean R700 ADL 223 here....
Topped with a Bushnell elite 3-12 it'll bughole 5 shots @100 using the old *222 full-house target loads of IMR4198..... right around 19g. Bullet seated to a soft/medium jam. Better than avg quality casting technique... that should see real tight control over weights.
Make a mould oven,and really buckle down on your timing. Yes,you need to visually check bullets but I swear,get'm cast well,and you're gonna be amazed at the weight QC. The things only weigh 55g... can't be having .3 or more weight difference and expect to not have other issues.
Not saying you get all wrapped weight segregation.... quite the opposite. You don't want any time wasted on sorting. Do what it takes and get them spot on,at the casting bench. Watch the nose dimensions,and at least try to use the body's,as cast. Crimp GC on by entering size die no more than required. This is one reason the leade in on the bullet sizer is so gauldang important. Study this,and it's the road map for when your cast has to negotiate the chambers leade. If you can't get perfection sizing a bullet straight..... what does that suggest slamming it into the barrel leade at launch? Sorry for the novel.
Good luck with your project.
*This isn't the only time I've seen this pop up. Using a slightly smaller cased,known accuracy load,to perform quite well with cast in a larger case. I don't get bogged down searching for "why's".... if the load meets safety criteria,and is obliterating X's....I'm calling it GTG.