I think the most appealing aspect of sizing bullets is that technically with most guns it will be the most accurate. Since many that shoot 1 and 28 twist are hunting and not target shooting let's look at the topic again from a hunting standpoint that you've defined in your title of your thread. 9 years ago when I first started shooting smokeless and sizing bullets I was initially so impressed with the accuracy that I stepped away from any plastic load. Because I am fanatic about accuracy ,one fall morning in Southeast Texas I had bullet sized, Fury bullets which typically have no spring back the ambient temperature and humidity had changed drastically while I was out hunting I had shot a hog around 200 yards away he was laying on the ground there were other hogs that had ran off at the initial gunshot but they came back out which of course inspired me to reload much to my surprise I had trouble getting the sized bullet down into the bore. I was able to get the bullet seated but it sure took a few more very critical moments. I ignored that situation and kept on shooting bore Riders wasn't long and I ran into a situation like that again second time it happened it really bothered me changing ambient temperature and humidity sure can affect seating a bore riding bullet in some parts of the country and other climates and areas it's not that big of an issue. Well let's stop for a moment and and just Define this if the bullet you sized and the bore you sized it for are constant then loading a size bullet will be faster won't it, you don't have to stick it in the plastic. If however you have ambient temperature change it's also going to be possible for you to have issues with the bullet that's been sized either they will get tight or they will get loose, I suppose that one could size a bullet loose to deal with this potential bore change if the ambient temperature dropped however I don't think many of us want to walk the woods with a bullet that is not seated firmly again if your target shooting that's not an issue, hunting is another story, this is never an issue with plastic sabot. I've never ran into any issues in the field loading a plastic load and the seating of the load on top of the powder charge and most of my guns is so firm and easy to feel that even without a witness Mark I could load my gun blindfolded and be confident I always feel that sabo set down on that load not to mention the seal from moisture that that sabot gives me too again I don't necessarily have that in a bore rider.
You've heard the statement by myself and maybe others I target shoot with bore riders, I hunt with plastic, I hunt with a plastic load not only for what I feel like is the security of loading and being in the field that it gives me I also hunt with plastic because of the accuracy available if the hunter will take the time to search that accuracy out all of my bore riding rifles shoot a quarter inch and less and all of them shoot a half inch and less with plastic, a quarter inch difference still way under one Moa.
Now looking at the 28 twist 50 cal of course most of the bullets available are 45 Cal and some type of plastic and then there's the fury bullets that fit the bore I guess there's some others like Thor Etc and other than that you would have to go to big lead I cannot speak about big lead I've never shot it and had no intentions of it I have had limited success with furys 500s 501s and 503s is universal bullet I haven't had much success with the problem for me with the 50 cal 28 twist is the 28th twist, I'm of the opinion that the 28th twist shoots best with a 250 to 275 grain bullet I know some people shoot 300 grain bullets but I don't see a lot of groups posted I hear a lot of comments about it's good to go or okay which I struggle with ,most 28 twists that I have shot and they've all been cvas have been very accurate with 250 grain bullets and some with the 265 stb Fury the accuracy I'm speaking of is 3/4 in or less in a 28 twist break open CVA with the Harvester black sabot.
I think a lot of which is best for you is determined by the conditions that you hunt in for me if I was hunting in a state that allowed plastic and I had spent a lot of money and time and planning to make that hunt there is no way I would be hunting with a bore rider. Again having not shot lead I would imagine lead is soft enough that the bore change is not an issue you can just tap or push your lead all the way down to the powder that's a different situation.
I have multiple rifles that will shoot plastic loads out to 400 yards even 450 and 500 less than Moa all of these rifles at 100 yards will put plastic loads almost in a hole you would look at the groups and swear they were size bullets not plastic loads there is a lot more accuracy potential in a plastic load then a lot of people have discovered and much of the secret I think of a plastic load is finding the Plastics tune Point not necessarily the bullets maybe that's another topic, I have spent so much time with the light blue the last four or five years and even the last three I've gotten really excited about its accuracy potential the black Harvester in a 28 twist or the red or orange for the 50 cal I do not have as much experience in shoulder time I'm going to turn a lot of my shooting time the next couple of years specifically to that issue and the 50 cal I hope to learn more about what is best there I'm sure convinced of this that caliber and that twist can absolutely get a whole lot better
A long post forgive the rambling I'm very interested in the topic and I very much appreciate the bore riding folks.