Purchased some new brass for my 74 Sharps, which is chambered for 45-70 Government. My rifle has a longish chamber, so I usually buy 45 90 and trim it to length. In these crazy times, Starline, which is my preferred brand, is nowhere to be found. But I found, and bought, 100 rounds of Jamison brass, headstamped "45-90 Win" (Winchester?), which looks close.
Can 45-90 Winchester be trimmed and sized to 45-70 Government?
Thanks in advance for all your help, in this and all my other dumb questions over the years.