In my experience with another caliber, be very careful with that RL19. I loaded with it for years, hundreds of rounds downrange with excellent accuracy and single-digit S/D's. Then, different powder lot & KABOOM! I didn't get hurt & the gun was inspected by the manufacturer's warranty gunsmith & pronounced to be undamaged, but the pressure excursion was estimated to be well in excess of 80,000 psi! PM on way.
900F
Thanks. Couldn't resist loading up one round of the 6.5x55. Nosler 140 gr BT over H4831, 43.0 gr, Lapua, CCI BR-2 primer, COL 3.025" BC is 0.509 with the sectional density of a javelin. Compare to 223 Rem/73 Berger, 243 Win/87 Berger, (6.5x55), 7mm RemMag/140 Nosler P, 308 Win/168 Berger, and 308 Win/150 FMJ. If it will stabilize at 1/8.66" it will be like shooting a dart. "What can Brown do for you?"
PS: Don't suppose there is any chance 3.025" will fit the factory mag, is there? Oh well, I can single load Mausers, having had lots of practice in 308 Win.