Yes Sipsey River had the 100 gr. inserts turned down to fit,then they were around 85-88 grs..What I did on mine,I mounted a field point in my drill and spun on the 50 gr. brass inserts.And then spun them and filed them down to fit,they came out to 42 grs. and with 175 gr. point gave me a 540 gr. arrow.The 50 gr. inserts are not near as long as 100 gr.inserts so it wasn't the hard to get them filed down to fit.I had already made my own before John had them available or I would have bought those.But it only took me a couple of hours to make them.