. Use 3-saddles if you have the barrel style. Improve intonation with compensated 3-saddles. You can buy inexpensive ebay brass saddles and use a file to cut the intonation slots yourself. Avoid using 6-saddles barrel-style because they rattle against each other. That's the main problem going to six barrels. Use 6-saddle block-style or stamped-style for more accurate intonation. Some bridge plates are designed better for longer/shorter blocks so if swapping to barrels you may need longer intonation adjuster screws or shorter springs. Some players like to mix: steel saddle on the low strings and two brass saddles on the high string. .