When I bought my replacement from Middlesex,the first musket having been stolen, I had already had a custom mould made up to fit my bore size. (These muskets do come through with varying bore sizes) so it is always best to wait before you buy any ball, mould wads and such until you get the gun in hand, they should send you the bore size when you receive it, and then you can double check it. I had asked Pete if he could match the bore size, or come as close to it as possible as he could. Since I had to wait a few weeks for a new batch to come in, he went through the new batch of muskets and came up with one that was within a couple thousands of the original one I had, so I could still use my Jeff Tanner mould. Great Customer service. But just a heads up for anyone considering an Indian musket, that what they say MAY be supposed to be .69 or .75 may not be. WAIT until it is in your hands to measure,or see what they tell you it measures out at, then order balls, moulds wads.