Single seven 327 federal magnum

[Willtallica]

So I just had the opportunity to buy a new single seven in 327 mag. I had seen a few years ago and liked the idea but it was the only one I had ever seen and nobody carried ammo for it back then. So a couple weeks ago I go into a gun shop and here is this single seven with a 7.5 inch barrel and I had to have. Multiple places in my area carry 327s now. I took it out today and shot a box and it's a great shooter.
That being said, my question to everyone is about how dirty this gun gets. I was shooting 100gr American Eagles and about half a box in the gun looked like it shot 500 rounds. It was dirty on the outside of the cylinder. Is this just the way the American Eagles are when it comes to the 327 or should I be concerned with the amount of "blow by"? I own many Rugers and yeah the single six's get pretty dirty fast if you're shooting remingtons but I've never seen Federal or American Eagle act like this.
Any advice would be much appreciated.

 

[Hondo44]

Jacketed or lead bullets?

You may be right about too much blowby.

You probably don't have unloaded bullets laying around. Does the bullet you're shootin' have a band of full diameter above the case mouth? If so, check how it fits in the the chamber throats.

Measure the throat diameters if you have the means. Or maybe a local smith has pin gauges to measure the throats.

 

[lolbell]

The A/E 100s are jacketed. These are the hottest loads for the 327. I have chronoed these at over 1700 FPS with barrels ranging from 4 5/8 to 7 1/2 and they have been dirty in every gun. The A/E 85s burn a lot cleaner. Don't know why, they just do. Hand loads with AA9 burn clean also, but the plinking loads with Unique and Trail Boss are pretty dirty. I just have fun shooting then clean when done.

 

[needsmostuff]

Nothing clean about shooting. Controlled small explosions.
Revel in it.

 

[Chuck 100 yd]

The .327 does seem to be extra dirty. No problem , they clean up real nice.

 

[Galaxiedan]

Did you notice any pressure signs? The ae ammo i used in my sp101 327 had very flattened primers

 

[Chuck 100 yd]

The .327 FM is a high pressure loading. Many people use small rifle primers when loading for it. Primer upset is not a reliable indication of pressure in magnum handgun ammo. Ease of extraction is a better indicator of high pressure.

 

[TJPopkin]

I am shooting 85gr and 100gr. Hornady XTPs as well as 115gr. 32-20 cast bullets using Power Pistol. I have tried loads in my S&W ported J-frame, a carry gun in 632-Pro, a custom Bowens S&W Model 16-4, and in my Single-Seven. The J-frames are a handful, but the Single Seven and the Model 16 S&W are stellar. Best 5-shot groups are about 1" @ 25yds from a secure rest. Power Pistol shoots loads are clean.

 

[Willtallica]

yeah i just took two boxes of 85gr AE's out today and they are much cleaner then the 100's. i just get a little worried after reading, hearing and experiencing some of the horror stories of the guns that are coming out of Ruger these days. I guess its time to start reloading for this one too

 

[2 dogs]

Every S7 I have measured has displayed .314" cylinder throats. You are shooting .312" jacketed bullets. Thus, you getting considerable gas blow by for the high pressure loads. It has to go somewhere....

My thinking is that Ruger is cutting the throats to .314" to help reduce chamber pressure. Still, all the factory ammunition I have shot has been in my estimation very very hot.