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55grn bullets and a starting load of powder should be extremely light in the recoil department. Pick a bullet that you have data for and use the recomended starting (lightest)
load listed for a fast to medium burn rate for 243. Sierra's fifth edition lists 36.2grns. IMR3031for a starting load for the 55grn blitzking, also 36.6 grns. of benchmark, 35.3 of H322, and 37 grns of IMR 4895 all starting loads. Using less than starting loads can create a serious over pressure situation which can be very dangerous, so do not use less than recomended starting loads. Hope this helps, Ron.
 
Yes, he could go to an even lighter bullet. The Hornady was just the first flat base I looked at, and that's because flat bases are usually easier to make shoot accurately at shorter ranges. But he could try their 35 grain V-max for even less recoil. I just expect it will be harder to get accuracy with. But it can be tried.

He wants the lightest possible load, and 70% filled with TB will be it for any bullet weight. The starting loads of the usual rifle powders will all be heavier.
 
no doubt Trail Boss is probably the bestest "powder puff" powder for what you wnat to do.

cast bullet load data is usually pretty low & slow.
again, you can adapt to use similar weight jacketed bullets.
you might be able to use a handgun or shotgun powder already on your bench.

no claims for accuracy tho.
..
 
Trail Boss is from IMR. Also, it is very fluffy and light for the amount of volume it takes up. These are properties it shares with the "Steel" shotgun powder. Anyway, when you buy a small container of it that would normally be a pound of some other powder, it will only be 9 ounces.
 
does anyone know what the absolute minimum load would be? Just want to get a round that will go bang and get her accustomed to something more than a 22LR. will only be shooting 50 -100 yds with this "starter" load

I know that Lyman manuels have mim and max load, look for one from a good manuel of the powder you are using and don't go below the listed Min. The reason being is you can get delayed ignition. The primer pushes the bullet out and then the powder fires afterwards. Can cause excessive pressures like those of a squib load.
 
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