shotslow

I have read that the stock recoil spring is 16 lbs. But why a lighter spring? Why not a 17 b spring. I have having s FTF problem with 180 g TC lead. Would a heavier spring help with the failure to feed? Whar does SSS stand for?

Thank you for the replies. I looked at several pages in this forum and tried some searches. Got nothing. I have some 124 FMJ loaded with Tightgroup. Not my favorite for lead. I use it for cowboy shotgun. I will load some more with Win 231. The testing is part of the fun. I have read in several threads that the 9mm crimp should be from .376 to .376 and that is what I am using for the 124 FMJ, Hornady 125 XTD HP and 147 grain molly lead. I will re-crimp all rounds. I will find the true answer. Well, for me. I did not mean to imply the changing of powder solved the bullets falling out. It was the tighter crimp. I may have to get another powder. VV N320 sounds like one I should try.

I am using Bear Creek molly 147 grain TC and am at 962 fps. Minor power factor requires 884 fps for a 130 PF with that weight bullet. But like BoxerGlocker, I am scared to change what is working. I have been saying that I had to really crimp my 9mm to keep the 147 g bullet from slipping out of the crimp. But my crimp for the last year has been .376 - .378. I was crimping at .380 since some factory PMC ammo held that crimp. I am shooting a M&P Pro 9mm.

I usually use Win231 with all semi-autos. When I got the 147 g molly bullets I started out with Win231. I had crimping problems. Even though I tightened the crimp the 147 g would slip out of the crimp from recoil. First 5 rounds would be fine, then it sounded like I forgot some of the powder. Sometimes the top round of the dropped magazine would have the bullet drop out. I tried AA #7. I had got this powder to load 357 Sig. Turns out it works fine for 9mm and 147 g Bear Creek bullets. I am using AA#7 to compare the two weights. I want the 125 grain bullets to win. They are cheaper. I like AA #7. The 6.3 grains are easy to see in the case as it come around with my Hornady progressive. I don't want to think about 135 g bullets. I just get confused.

I have decision to make. Get 147 grain TC from Bear Creek (moly lead) or 125 grain RN. I ordered 3k 147 gr last year and use 6.3 grains of AA #7 to get a 136 PF. I have 124 g FMJ Zero bullets, when loaded to PF of 130, these seem to have more recoil and blast. Why does one use a 147 grain bullet over a 124 grain bullet? I am asking the question for all 9mm bullets of these weights. I use lead because of expense, but would like to know the opinion of those who can afford better or not.

I use 6.3 gr of AA #7 with a 147 grain moly TC. I get a FPS of 992.1 for 5 shot average. Data for lead 147 bullets are scarce. The 47th Lyman manual has 9mm 147 gr data. It lists Clays at 1.8 min to 2.8 max for 147 gr lead. No listing for jacketed. I was looking for a powder for 357 sig, That's how I got to the AA #7.