JASmith Wrote:Stan, Can you either post of picture of the stacking configurations for a 30 round SPC and a 29 round Grendel / Carcano?No, but the cartridge stack heights can be calculated:
Gre 0.445 x 15 = 6.675
SPC 0.422 x 15 = 6.330
The SPC would have two 15-rd staggered columns compared to one 15-rd and one 14-rd column for the Grendel, making the total stack height of the SPC approx. the same as the Grendel's 6.675 inches.
Quote:The larger case almost certainly makes for a larger magazine, so I could see the Grendel-based magazine being fatter than the SPC magazine.Of course. However, the difference in magazine widths would be less than 0.05" -- so small it would be virtually unnoticeable.
Quote:I would also like to see a definitive discussion on how a half-inch change in cartridge length has a significant impact on ergonomics.Some time ago (maybe 2-3 years), one of the guys on 68forums posted a thread about an experiment he did in this regard. He taped strips of cardboard to a magazine, to build up the width and length to match cartridges of different diameters. He found that shorter, fatter mags were easier to handle than longer, thinner mags. I regret not being able to post a link, but I don't recall the thread title or author.
Whether this would be judged as having a "significant impact" on ergonomics would depend upon perception and opinion, which will no doubt vary from individual to individual. People with small hands may find the difference to be more significant than those with large hands. I know that it is much easier for me to handle an M16 mag than an M14 mag.