You won’t know until you try. Had a shooting play date with a buddy a while back. He brought his Pedersoli Gibbs and I brought a TC with a GM LRH barrel with a slower twist (1-30). We both brought our sizing setup so we could try each other’s bullets, with the Gibbs requiring a bullet diameter about .003” smaller than the GM LRH, as I recall (I have notes somewhere, but did not look). Short story, neither gun was at it’s happiest with the other gun’s bullets. Buddy had two different ones, one about 550 grains and the other just under 600 grains. My GM didn’t care for either compared to the approximately 410 grain paper patched bullets I normally shoot. The 410 grain bullets opened up the groups when shot out of the Gibbs. All the bullets were flat base shot over wads. Remember the Gibbs powder charge sweet spot being near 100 grains with the heavier bullets, while the GM’s was 80-90 grains of powder under the 410 grain bullet. With the Gibbs tilting the scale 3, maybe 4 pounds more than my TC, it was easy on the shoulder with the heavier charges and bullets.
