Jabali- BR shooters use much smaller cases than the .303. The old medium capacity .303 works best with mid range powders in the H4895 to IMR4320 range. Some loads do best with the 4350's, especially with heavier bullets. RE#7 is in the IMR4198 range and in may ctgs. the data is almost identical. Reloader#7 is just a tich slower burning than 4198 and is too fast for most bullets in the .303.