[jjas]

The new 20ga. K.O.'s (NON SABOT) just came out . Yes, they will foul the bore with lead just like your.22 rf. The clear coating they have on the slug however really minimizes the problem. Check the accuracy/price vs. the super slugs. Note these are not long range slugs 100yd+.
If you are within 75 yds of your target it is a done deal...
VENISON !

I've seen these on Brennekes site and wondered how well they would group and if lead fouling would be a problem for rifled barrels. I just wasn't aware they were available yet.

I agree with you completely, anyone who hunts in typical areas where your shots are 75 yards or so should definetly check these slugs and see how they group out of their slug gun.

You can still kill a deer and save few bucks on ammo in the process.

Jim