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1st off you will need the following
patience,a mouse ball with the rubber casing taken off and a tube of valve grinding compound and some oil.

now what i do is usually look at the crown of the muzzle, most bores that are old tend to have worn lands from repeated cleaning from the rods rubbing against them with out a bore guide to keep them off,restoring them to sharpness will make the groups shrink down in size and will help alot.rome wasnt built in a day and neither was your rifle so take your time and do it by hand.never use a drill and screw period no matter what your told,or a tool like the brownells muzzle crowner unless its shukked in a lathe and the bore is absolute trued to it zero.

let the crowning begin,first take the rifle .clear it ,make sure  it aint loaded.an air conditioned skull sucks.now take a bore batch and stuff it in the muzzle down about 1\4 to 3\8ths of an inch,this keeps the crap out of the rest of the bore.the valve grinding compound usually has a liquid in it but if not and as usual i coat my ball beaing in oil to help hold it in place.now coat the ball in it.now with a light pressure on it turn the ball by hand on the crown of the bore,you'll feel it cutting a new face on the crown edges ,when it starts to feel smooth and not like its cutting add more compound and oil.also check it when it feels smooth to see if the lands and grooves are sharp yet.turn the ball all different ways to get an even cut on the crown.heavy handed on one side will cut that side more and we want it it even not offset.a good way to do this is use a magnifying glass to inspect after a swipe with a patch,also run a fingernail across it.a sharp land will feel like its cutting the nail as you drag it from the bore out.this will take up to 20 minutes to do by hand for the roughest worn crowns and as i said it will bring the groups right back in the black.the worst cases i have seen had to have about 1/2 inch of barrel lathed off to get some good lands again. the used mil surplus rifle off the one way rack at the shop and the old hunters well carried rifles being the worst of the lot.the reason for the mouse ball is simple ,the size gives you about an 11 degree cut and thats optimum for the crowning and on a 30 cal bore its just right i find, altho i would like to use a smaller ballbearing tho but havent been able to find one,the cutting process leaves about a 1-2\64ths" cut on the muzzle around the bore with aproximates close to a stock cut at least on mine.at 50 yards with my 1973 winchester i can hold a one hold a small one hole group all day now with iron sights.also buy yourself a bore guide as its your muzzle crowns best friend when cleaning to protect the lands of the rifling.