stabilizing 100 gr bullets with 243 win.?

A bullet's mass (weight) has nothing to do with a barrel's ability to stabilize lead core bullets. The bullet's diameter squared multiplied by the constant (150 below 2800 fps and 180 above 2800 fps) divided by the bullet's length in inches will tell you the rate of twist required to stabilize it. This is the Greenhill formula and has been with us since the late 1800s.
 
Winchester designed the 243 with a 10' twist to handle 100gr bullets. Of course they didn't have the long bullets they do now. I've had no problems with 100 gr hornady or noshers in a 243. You should be fine if you keep your velocities up.
 
Wife's Savage 111 shoots federal blue box 100gn into 13/16" groups from the bench. Shots on deer out to 200yds have NEVER failed.

She punched through one buck, double lung, 140yds and the blood trail was 4 inches wide, spraying on everything, he went 20yds off of his first jump and collapse. It was a great trail for teaching her to track, even if we could see the buck from the cut line and she couldn't. She still looked for the right stuff and once she found the spot where it was hit, she followed it into the woods and walked to it.

No stabilizing problems with that round.
 
I know of 2 .243s, a 1-10 twist(BAR and a Savage Bolt) both shoot the 100 grain very well. The BAR is 22" barrel IIRC and the Savage between 20-22" as I cut the muzzle back and turned a new crown in the lathe to get it to shoot again. No keyholing with any factory ammo. from 58 gr to 100 gr.
 
Well I got out today and tried some hornady 87gr. flat base soft points with IMR 4350....really happy with the results as compared to what it did with the 100 gr BT's. Both 42.5 gr amd 43gr loads were less than one inch groups at 100 yards, with the 42.5 being the better of the two...I think the wife will be happy with that for now. :) :)
 
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