Cylinder Gap tests. Obviously, this is a very small sample size for both the ammo and the guns we tested, so take these results with a grain of salt, but there are a few things I think we can learn here. I suspect the barrel length that maxes .357 magnum velocity is probably quite long - longer than any rifle barrel made for that caliber. of this rather nutty project. over what ammo or caliber or gun is "best." The most significant instance of this phenomenon was the Smith & Wesson Model 28-2, which took a huge nose dive in velocity with the two jacketed .38 Special bullets compared to the 3-inch barrel and the other two 4-inch barrels.
Buffalo Bore also claims that their “Heavy” .357 Magnum hard cast 158-grain loads will produce 2153 fps and 1626 lb-ft from an 18″ carbine. The 6-inch Taurus revolver has a ported barrel, which might account for it’s fairly unimpressive velocities. JHP: Federal 130 gr. ATTENTION: Effective Sept 1, 2020, the BBTI Project is in "Archive Status." For every load, there was a velocity increase between the 2-inch barrels and the 4-inch barrels, but adding an additional two inches did not always produce greater velocity from the 6-inch barrel. How much does barrel length impact bullet velocity in .38 Spl and .357 Mag revolvers? EDIT: A reader shared with us this article originally printed in the 1974 Speer Reloading Manual. If you still feel you are qualified to post in those subforums, please contact "Shane Tuttle" (the mod for that portion of TFL) via Private Message for assistance. 357 Magnum: LRN: 158: 225: 800: 357 Magnum Follow Lucky Gunner Lounge from your Inbox! The longer the barrel, the greater the velocity, and for self-defense rounds, higher velocities often translate to … Compared to the 4" barrel you will get an increase in velocity (100 fps +/-). JHP: Cor Bon 125 gr. Legal Disclaimer. The Kimber also showed pretty middle-of-the-road velocities compared to other short barrels. were either familiar with, or because they were what was available, and mentioning No right answer here. So we got out the chronograph and measured velocity for a few different loads that we just happened to have in the safe – four .38s and four .357s. We did all the work. No further tests will be conducted, but we will maintain this site and data for the use of for a Muzzle Energy graph. Taking a quick glance at the chart, it’s readily apparent that the velocity, If this kind of nerdy velocity stuff gets you excited, check out, semi-auto calibers that we’ve tested in the past, this article originally printed in the 1974 Speer Reloading Manual, Cruiser Ready: How to Store a Home Defense Shotgun [2020 Update], You Can’t Use Your Sights in a Gunfight: Another Myth That Just Won’t Die. It includes the results of Speer’s velocity testing of three different .357 magnum loads with 30 different firearms. With .38 Special, and especially with .357 magnum, conventional wisdom says that barrel length has a huge bearing on the effectiveness of the bullet. That might be a generally decent rule of thumb in some cases, but obviously it’s not absolutely true. calibers/cartridges + DPX: Federal 125 gr. In some cases, however, the velocity actually drops going from a shorter to a longer barrel. With .38 Special, and especially with .357 magnum, conventional wisdom says that barrel length has a huge bearing on the effectiveness of the bullet. Both are good. At the longer lengths, the round was actually exiting the barrel slower as barrel length increased.
The longer the barrel, the greater the velocity, and for self-defense rounds, higher velocities often translate to better penetration and expansion. Without his help all of this would have Mine has a 4" barrel for that reason. And if you think you could do better, feel free to spend the money Hornady makes a .357 Magnum 140-grain Leverevolution that claims to get 1850 fps and 1064 lb-ft from an 18″ carbine. for a Muzzle Energy graph for the tests in this caliber. And remember to also check mostly) paid for everything ourselves, and we did not receive any kind of sponsorship It is technically longer than 4 inches — 4.2 makes it legal to own in Canada — but it’s one of the most popular 4-inch revolvers on the market, and the velocities we measured with it didn’t show any unusual outliers. Maybe they have a different rifling twist rate, or a wider cylinder gap or maybe the chambers aren’t as tight. If we tried to predict this data using the “50 feet per second per inch” rule, each line on the graph would progressively rise higher as the barrel length increases from left to right. We are very close to having that wrapped up and I’ll be sure to let you know as soon as the results are ready.
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