![]() ![]() 38 Special and will likely not see magnum primers in any factory ammo in this caliber. This could be considered acceptable since this gun is chambered in. However, it was not completely reliable with CCI’s 550 Magnum Pistol primers, setting off 94 out of 100 rounds. It reliably fired 100 out of 100 of four standard non-magnum primers: CCI 500, Federal 100M, Remington 1½, and Winchester WSP. I tested the Wolff standard-power Type 1 mainspring in the Model 67 with five different primers. I don’t have a way to measure this but took the idea to heart and fired all loads double action with the thought that if it fires with a “weaker” hammer fall from double action, that should be the more rigorous test of the mainspring’s reliability. Thus, the less distance the hammer moves during the firing cycle, the less force it generates to hit the primer. Many believe a double-action trigger pull produces less hammer force because it does not travel to the rear as far as when the hammer is cocked in single-action mode. I used handloads with a variety of primer brands.Īll ammo was test-fired in double-action mode. Here again, I couldn’t say how this might affect sensitivity, but I included some magnum primers in my test ammo. Magnum primers, by reputation, have thicker cup material to better handle magnum pressure. But this means that even though a gun reliably fires Federal primers, it might not reliably fire some of the other brands.īefore conducting this test, I couldn’t say just how sensitive the other primer brands were, so I included several brands. Federal has a reputation for having the most sensitive pistol primers, and they are very popular among competitors who tune their guns to have the lightest trigger pull possible and still be reliable. I have determined that when it comes to reliable ignition with a lighter trigger pull the brand of ammunition you use matters. Lighter trigger pulls are wonderful, but the gun still has to “go bang” every time the trigger is squeezed. With all three mainsprings, the double-action trigger pull did not change much after rebound springs of 13- and 14-pound weights were installed.īut how reliably does the revolver operate with a lighter trigger pull? Reducing the strength of the mainspring reduces the force of the hammer strike. The Wolff reduced Type 2 Power Rib mainspring reduced the double-action trigger pull by about another 2 pounds. Wolff says its standard Type 1 Power Rib mainspring is equivalent in strength to the S&W factory mainspring, but I found that it reduced the double-action trigger pull on my gun by 3 pounds compared to the factory mainspring, and it maintained a consistently reduced pull of 2 to 3 pounds when combined with all the rebound springs. ![]() The lightest single-action trigger pull with the 11-pound rebound spring was 2.8 pounds with the factory mainspring and the Type 1 Wolff mainspring and 2.6 pounds with the Wolff Type 2 reduced-power mainspring. The single-action trigger pull was reduced (mostly) to around 3 pounds or less once the rebound spring weight reached 13 pounds or less. Trigger pull weights decreased fairly consistently as the rebound spring weight decreased, though the 12-pound rebound spring had a slightly higher average pull weight than would be expected. The single-action trigger pull was over 4 pounds with all of the mainsprings when combined with the factory 18-pound rebound spring. The standard-power mainspring is recommended for critical applications, such as law enforcement, while the reduced-power mainspring is recommended for target and non-critical applications, according to Wolff. Wolff makes two Power Rib mainsprings for the K-, L-, and N-Frame guns: a standard power (Type 1) and a reduced power (Type 2). All four frames use the same round wire coil trigger rebound springs. The K-, L-, and N-Frame guns use a flat mainspring, and the J-Frame guns use a coil-type mainspring. Wolff Gunsprings makes springs for J-, K-, L-, and N-Frame S&W revolvers as well as for many other brands. The rebound spring affects both single-action and double-action trigger pull weight. ![]() The mainspring controls the double-action trigger pull weight but has little effect on the single-action trigger pull. hammerspring) controls the hammer, and the rebound spring controls the trigger. I’m focusing on Smith & Wesson revolvers in this report, and two springs control the trigger pull in S&W revolvers. The trigger pull can be greatly improved just by changing springs, but it isn’t always obvious what a final trigger pull will feel like with which springs, so it’s not clear which pound-strength to buy. Factory double-action trigger pull weights generally run from 12 to 15 pounds for most revolvers, with 4 to 6 pounds for a single-action pull. Double-action revolvers are well known for their long, heavy double-action trigger pulls. ![]()
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