FJC
Member
I've been reloading 9mm for a while, and my favorite load has been a 124gr jacketed bullet (HP usually, RN sometimes) with 5.3gr of VV N340. I'm sure I've checked it against VV's data multiple times in the past. It runs great in my guns, and I've never seen any signs of overpressure.
I just downloaded their latest reloading guide, dated 2006. In it, they list 5 sets of data for 124gr 9mm loads. If I eliminate the lead bullet ones and another oddball bullet, there's this data:
124gr Hornady FMJ/FP, N340 min:5.3 max: 5.7
124gr Lapua FMJ-RN, N340 min: 4.5 max: 5.1 (huh?)
124gr Rainier RN, N340 min: 4.7 max: 5.1 (ok, it's a plated bullet)
So, why is the min and max powder level so much higher for a Hornady FMJ/FP than it is for a Lapua FMJ-RN? My current favorite load is OVER the max for two of those examples, and at the minimum for the third! I'm mostly using a Montana Gold jacketed HP...now I'm wondering if I'm at the top end (or exceeding) what I should be using...
I just downloaded their latest reloading guide, dated 2006. In it, they list 5 sets of data for 124gr 9mm loads. If I eliminate the lead bullet ones and another oddball bullet, there's this data:
124gr Hornady FMJ/FP, N340 min:5.3 max: 5.7
124gr Lapua FMJ-RN, N340 min: 4.5 max: 5.1 (huh?)
124gr Rainier RN, N340 min: 4.7 max: 5.1 (ok, it's a plated bullet)
So, why is the min and max powder level so much higher for a Hornady FMJ/FP than it is for a Lapua FMJ-RN? My current favorite load is OVER the max for two of those examples, and at the minimum for the third! I'm mostly using a Montana Gold jacketed HP...now I'm wondering if I'm at the top end (or exceeding) what I should be using...