Yes, the 300 Blackout cartridge is made to take a small rifle primer. Other Frequently Asked Primer Questions: Will small rifle primers work in 300 Blackout reloads? Now I either use #41 primers, or, more frequently, I just load all my. I initially developed my 300 Blackout loads using regular small rifle primers. They’re also made from the same material and use the same explosive.Īs always, do your own testing to confirm using safe load development practices. Specifically, the CCI 550 Small Pistol Magnum primers and the CCI 400 Small Rifle Primers are the same size, with the same cup thickness. ![]() We also read a report that said for one manufacturer, they’re identical to the regular small rifle primers. We’ve also gotten reports that yes, you can also use small pistol magnum primers to develop your loads. Can I use small pistol magnum primers in 300 Blackout? Every gun is different, so see how your gun will react before you just full send it with 300 Blackout reloads with small pistol primers. Also, when test firing, load 1 in a magazine, then try with 2 in the magazine, then 4 or 5, before you try a full magazine. As with all reloading, if you decide to try this proceed with caution. I’ve never actually seen it happen, though you can always get someone on a forum to claim that they’ve seen it happen. ![]() There isn’t enough force to set off a factory 300 Blackout round, but that may not be true if you have small pistol primers.Įssentially, this could mean that you pull the trigger once and it could empty the whole magazine. The free float firing pin makes contact with the next round’s primer when the new round is chambered. Your main problem with small pistol primers is the cup thickness and the free float firing pin in an AR style rifle. Some report that they can even chronograph at faster speeds than with small rifle primers for that cartridge, though we haven’t verified this for ourselves yet. We have seen some reports that yes, many people have gotten small pistol primers to work in their 300 blackout loads. Berger Bullets Reloading ManualĬheck Price on Amazon Will small pistol primers work in 300 Blackout? Most reloaders are able to use these interchangeably with the magnum small rifle primers without adjusting their load data, but you do your own testing if you choose to use the #41 small rifle primers in your 300 Blackout loads. The #41’s have a harder cup and are very popular for reloaders who shoot primarily out of an AR15 platform. ![]() In the end if you are following good reloading procedures, load light and build up to what you want with either one.” Can I use #41 small rifle primers in 300 Blackout reloads? You can over pressure the case quick so be careful. You need to burn a lot of powder quickly. I asked my personal gun smith, who also taught me to reload his opinion on small rifle vs small rifle magnum and this is what he said about it: “I’ve tried both. It’s good to see how different powder for 300 blackout will shoot with a primer and with your rifle though, so test. The powder savings is only a couple tenths of a grain, but that can add up. If they cost the same and your manual is calculated in magnum primers, I’d use magnums. In theory, magnum primers are more efficient and require slightly less powder to get the same velocities and power. Hornady is one example of one that has their load data calculated with small rifle magnum primers, namely the Remington 7 1/2 primers. Yes, some reloading data are made with small rifle magnum primers. Check Price on Amazon Can you use small rifle magnum primers in 300 Blackout reloads?
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