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So hell, cheaper powders around the same burn rate will get you there if push came so shove for match ammo, but don't think that your going to run 600 rounds of badly fouling ammo through a tighten action match rig that chews the same hole without a lot of cleanings/running the rig over lubed to prevent jam problems that day of practice instead. To bottom line it here, during practice, its not uncommon to run around 600 rounds a day through the pistol and the last thing you want to have to do is do multi cleaning on the pistol through the day to keep it running. With a slower burning powder, you're reducing the pressures of the load to get a less ideal burn, and in some cases even with a cleaner burning powder, dumping unburnt powder back into the action to cause problems during the target run instead.
40 S&W 175 GR TC ACCURATE 5 FULL
It does a full clean burn before the bullet leaves the barrel and has the load close to max pressure for the most consistent of burns as well. So out of a 5" barrel, shooting a 180gr bullet, N-320 has and always will be the powder choice for this load be it cast waxed, cast PC, or even Jacketed bullets. Lastly, since you will have a ammo test to determine if the your making MPF, you want to load at a least 1 point above 165 instead.ġ66000/180=922.22 so we round it up to 923fps that is your target for the loads. Note, going faster than this just brings more recoil and not what you want.Ībroad since the MPF is 170 (down from the old 175)Īs for if you are not at this MPF speed for the ammo through you gun, then you are ding in points for any shots out of the X zone instead. So the bullet in you pistol has to go at least 916.666FPS to be a major power factor. To get the MPA of a round, you will divide the bullet weight by 165000. So in USPSA, in limited class, it states that the smallest caliber you can use it 40, and it has to make a power factor of 165 currently in the states, and 170 abroad (used to be 175 for both ). In target comp's, recoil is your enemy, since the more recoil you are dealing with, the slower you will be on the follow up shots. Since some of us are bringing up MPF, here is the low down. If you want the most power you can start with the powders making the most velocity in load data. I shot all mine up in 45ACP and followed forum advice to try WST. W231 might be a good choice if you have a short barrel and or chamber over WST. Load long cartridges with more powder safely. 40 gun has a 6" barrel so it's a little easier to get velocity and it's throated so I can Sensitive but it's cheaper and good for cast loads (especially 45ACP). They are good for the 918+ velocity I seek with reduced recoil and price is less than N320. I'm heavily stocked in WST and Solo 1000. They will generally make less recoil at a given velocity compared to the slower powders. Your faster powders will reach max loads at lower velocities. The slower powders will get you higher velocity 40 loads for all your powders except the CFE pistol(it's pretty new) so you are well stocked. I tend to look for cheaper powders for practice. The only negativesĪre price and availability. Viht N320 is highly regarded for this in USPSA. But if what you are using works and is accurate, then keep on using it.I'm a major power factor shooter (over 918 fps with the least recoil with 180g bullet is desired). something in the mid to mid slow burning for maximum velocity.
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I believe AA#5 and AA#7 are more suited for the 40. I am not surprised that AA#9 was leaving unburned powder. it goes along with Titegroup, 700x, Red Dot, AA#2, Nitro 100 and the like. Bullseye is one of the fastest powders on the market. Those powders are usually reserved for the magnum calibers. in the range of Alliant 2400, Hodgdon H110 and Win 296. AA#9 is one of the slowest pistol powders on the market. Going from Accurate #9 to Bullseye is a big jump powder wise. I stopped using it due to the smoke issues. with a 180, the starting load starts around 4.2 gr and the max charge hovers around 4.7 gr. Tightgroup is another fast burning high nitro powder that people like. in my experience, they tend to be less smoky. I tend to like a single based powder over the double based propellants. Unless you are shooting competition and need to make a specific "power factor" then chrono'ing the ammo is not neccesary. If it is cycling the action, then that should be good enough. anything more and there can be headspacing issues. on crimping an auto pistol round, you just need enough to take the flare from the case mouth. IMO Bullseye is just a tad fast for my preferences.