I usually use muzzle loaders round balls. It is no trick to jam a .36 or even .45 cal roundball into a 6.5mm barrel. Just set it on the muzzle and pound it in with a plastic mallet. You will cut off the mushroom head just pounding it like a head gasket. I often drive the lead only half a diameter of the ball and pull it back out to get the muzzle measurment - looks like a mushroomed bullet.
Cheers from Grayest California,
Any brand but South Bend egg sinkers are pure lead and a small pack will do six gun throats also. Take your mike to the store to verify size. Use lead sinker wire for impact casting to get an impression of the throat. I use a gas check as a follower then a cold rolled steel rod for the push. Large hammer with light taps works much better than a small hammer with heavy taps per Veral Smith. John.
Another way is to find somebody who can cast you a few of the next smaller caliber (like .30 for the .303) bullets out of pure lead. Then use them to slug the throat. BTW, you know to use an empty case full of lead to upset the slug against, right?
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