I have been using REM 7 1/2's ever since I bought One of the first .17 cal Rem Model 700's rifles.
They were made for the .17 Rem because of the pressure.
Actually, as I mentioned in an earlier post, 7-1/2s were primarily introduced for the .221 Fireball, which appeared years before the .17 Remington. But same deal: Thicker cup than the 6-1/2s to resist higher pressures.
No no MD I don't think so, the 17 rem was introduced by Remington in 1971,
the 221 fireball was not introduced until 2007. I've read many times the 7 1/2 was created because of the .17 rem. and the fact that 6 1/2's were not going to cut it. In 71 I was interested in a .17 as soon as I heard about it. Remington said no small rifle primer at the time were recommended for the 17 rem except the 7 1/2.
Today there is some other primers that could fit the bill, not so then.
