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Gatofeo · May 6, 2012, 12:38 AM

A couple of years ago, I ordered 1,000 9mm Full Metal Jacket bullets of 115 grs., made by Winchester.
When they arrived, I was surprised to find they had a small hollow base.
I searched the internet and found an interesting claim:
The hollowbased 115 gr. Winchester 9mm bullet has a hollow base so the bullet is the same length as the 124 gr. full metal jacket by Winchester. This allows for bullet seating on the same machines, without making an adjustment.
Makes sense.
Now, whether it's true I don't know but it appears reasonable. I don't have a Winchester 124 gr. bullet to compare it against.
So perhaps your 9mm bullets with a slight hollow are a little lighter than another bullet by the same manufacturer, but share the same profile.

May 6, 2012, 12:38 AM	#11
Gatofeo Senior Member Join Date: October 1, 2004 Location: Remote Utah desert Posts: 224	A couple of years ago, I ordered 1,000 9mm Full Metal Jacket bullets of 115 grs., made by Winchester. When they arrived, I was surprised to find they had a small hollow base. I searched the internet and found an interesting claim: The hollowbased 115 gr. Winchester 9mm bullet has a hollow base so the bullet is the same length as the 124 gr. full metal jacket by Winchester. This allows for bullet seating on the same machines, without making an adjustment. Makes sense. Now, whether it's true I don't know but it appears reasonable. I don't have a Winchester 124 gr. bullet to compare it against. So perhaps your 9mm bullets with a slight hollow are a little lighter than another bullet by the same manufacturer, but share the same profile. __________________ "And lo, did I see an ugly cat. Smoke. Brimstone. Holes in parchment. And this ugly cat was much amused." --- The Prophesies of Gatodamus (1503 - 1566)