B52, boy, you need a wake up pill on how R#15 is a barrel eater....no schitt! Heat index is among the hottest on R#15. IMR 4064, while popular is also a barrel eater.
Read BoatAnchor's post....take it to heart! AA2700 is one of the coolest powders on the market today, and 44-44.5g in a Rem case, with a 9 1/2 primer shoots tiny bug holes with the 50g Nosler ballistic tip at a solid 4000 fps in a 26" barrel with less than 10 fps SD!
Win 760 is a great powder for the 50-63g bullets, but AA2700 burns much cooler.
Seat those bullets no more than .003 off the lands. As the lands gets washed out, try and find a 55g Sierra Semi point or a 55g Sierra BTHP, then go to a 63g Semi point as the leade gets washed out.
Sell the R#15 to someone that you do not like.
PS. Start off at 43g of AA2700 with a 55g what ever, Rem 9 1/2. tiny kiss on the lands, expect no paper between the bullet holes, 55g Noslers are wicked ugly on coyotes, 55g hornady SP on hogs and deer.
Last edited by keith; 10/23/21.
