![]() ThanksI would suggest you run your standard primer load over a chronograph and try to match the velocity using magnum pistol primers. In my local area, none of gun shop have any small pistol primers. Max load in the manual is 4.1 grains of Bullseye. The manual I'm using is the Lyman Cast Bullet handbook-4th edition. Primers to be used are Federal small pistol magnum primers. My load is 3.8 grains of Bullseye with a 124 grain lead round nose bullet(Lee mold) to be used in a Barretta M9A1 pistol. I read the above posts regarding magnum primers in 9mm and I believe I should be ok. I suspect a Magnum primer in a large capacity case full of slow burning powder will have a much different result. ![]() it is limited to small charges of fast burning powders in a small 9mm case. ![]() My experience that you are fine using them in in 9mm loads. My current go-to load is 3.2gr Prima V / TBB 147gr / 1.10 oal / Fed SPP Magnum / light taper crimp on Lee FCD / Chrono at 890fps in my CZ I have shot many thousands of The Blue Bullet 147gr (actually 150gr) 9mm coated rounds using Nobel Sport Vectan Prima V (after running out of VV N320). So I loaded up on them (ha-ha… see what I did there?). But Federal Small Pistol Magnum and Small Pistol Magnum Match were available. During the “primer panic” a few years ago, Federal Small Pistol primers were as rare as Mike Tyson showing up to compete in a Spelling Bee. This is using 124gr and 147gr coated and JHP projectiles. However, my personal experience in shooting 9mm (emphasis on 9mm only) in USPSA has been that Magnum primers made almost no meaningful difference in velocity, but often resulted in slightly better groups at 20+ yards with lower velocity deviations. I would have to defer to those members who are true authorities in the Cast Boolit field. In general, ball powders need a magnum primer. Remington will tell you to use there 5 1/2 primer. Although a shooter would never notice this in a production firearm, that double hump was worrisome, and we abandoned that mix. Then the bullet retarded as it engaged the rifling, creating the second peak. The primer’s extra gas unseated the bullet while still trying to light off the main charge, producing one peak. It was a classic case of high gas volume but too little temperature. One QA tech commented that it looked like the dual humps of a Bactrian camel. Instead of the normal single peak, we saw two. I remember when CCI was working with some experimental primers for 9mm Luger, and we started seeing odd time-pressure curves on the computer. When the output gas volume of the primer approaches that of the cartridge case, sometimes special handling is required. If you’re interested in using reddit for self-promotion check out our Official Spam Policy.You can have too much primer. Other Subreddits you may be interested in: This unfortunately includes reloading components like brass, and projectiles. Due to reddit policies all posts selling, trading, or buying ammunition are forbidden. If you'd like to post reloading equipment for sale, for trade, or a request for something you'd like to buy please put, , or respectively, at the beginning of your title. R/Reloading discord join us for supplies and helpful conversation: Https://discord.gg/reloading Posts titled " Help! New Reloader." will have less responses than a post titled like "Questions about crimp for. Please make sure you title is relevant to the specific question you are asking. Remember, if you post a picture, make sure to provides some context.
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